Malicious PDF — malware analysis report

Static analysis result for SHA-256 f79e91f8a5296e7a…

MALICIOUS

PDF

206.8 KB Created: 2021-06-30 22:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d8d36a8786b510e75307b7e25c6a477a SHA-1: 3e81fbe394613d1efc88c4a81cc66e06552a3aa7 SHA-256: f79e91f8a5296e7af306676e437fbd77aa2d7b57278193655c942efe51c0c326
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high-severity heuristic indicating a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution attempt. The presence of a 'download button' lure and a callback lure further supports a malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing campaign aiming to trick users into downloading a malicious file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8865

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/34ef97d352f4e90edbb55b6005861eb3/84879528737.pdf In PDF document text
    • http://baigeleather.com/userfiles/file/sugejiwazebogetexuvobonib.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/tumetexibabenomuluvepago.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/mupoveziwugoxi.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/epalsh9ma525hm2p2g0fpsduph/mefofopafu.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/44da2337598175efdef89ee2f6507c78/54832234536.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/jezigewemudobubajirotufe.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16078e4afafc76---sidosolerapegidezosalafub.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607604261fbd9---9527379027.pdfIn PDF document text
    • http://954move.com/clients/4890/File/18647445506.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/10427093964.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088baed1fb23---46989927132.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7fd7c98425---netimelolonezit.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/d0e4951c6abf0baf600c0f821ceb61a2/vedebanadip.pdfIn PDF document text
    • http://changju-hotel.com/CKEdit/upload/files/98105800901.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/vilixilexoxenojiwawofe.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/at00choefr89lirrb9n3msrvo8/75364108659.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/c1dab525f5ab4b99667205c1c08aa006/rilezeke.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/d5a76da2b8c8576e6f74b0bf95cc3db4/94198268102.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160996e4066816---wudiwebatofub.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/p8pat5derfronnnknj1f2c2cb3/52802259064.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f57f9e6d09---48029966513.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/1d86d69145672f250c9f879ef1406df4/fuwabezesijamutasomikeru.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/11159279610.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/josijejedixexov.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/2a2e2aabc293786b133c3fd40007c7ea/60484136554.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=digimon+adventure+psp+download+englishPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002af4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AF4A 11092 bytes
SHA-256: 618f24617f1580b6795e0630fbaa33198ad04fc0e0e1f003d09d718e6f5d2ab3
font_01_sfnt_off0002c8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C8D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002e0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E0E5 17248 bytes
SHA-256: 9b8f58b3a90800fddb7bff3142f524787e412e8396cdaaf4700251359b41162f
font_03_sfnt_off0002faa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FAA6 18948 bytes
SHA-256: 427874e6fae4fa1bbe3e4a9bec91f35c2fc17dd4088c9ec2d8898055077e8b63