Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6df60f545d36299…

MALICIOUS

PDF

82.6 KB Created: 2021-09-04 18:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6974144df93bcfbb3e873b57efacb37e SHA-1: c08f353ded46639e47475371b866dcf902c5b8a8 SHA-256: b6df60f545d362993191470059a66dfaf3cec885e508dd26914b2a7bda6ad76e
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file exhibits characteristics of a phishing lure, using an invoice/payment theme to entice users. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a mechanism for delivering a secondary payload. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://krisoc.ru/uplcv?utm_term=plumsail+documents+convert+html+to+pdf PDF link annotation
    • http://gernano.eu/gfx/userfiles/files/sixopaxasewofurakuve.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/62837840740.pdfIn PDF document text
    • https://jagamimpi.org/contents//files/gijojor.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8440b3a092---68701896350.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/071cde49d18cf2a284a224e31820bd80/44021873033.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/e14fbf99f5f577d67de36009592d1a92/72909688488.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/88632745188.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/77157cadb0ad863b1cd6d9393395fc75/92894129237.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/28997574953.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/39023234542.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/nikagavizanelonab.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16116081c4e127---43959468515.pdfIn PDF document text
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774f75be9cc---jitarawijivome.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/xobizubofewejamovowoton.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/68517952135.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607863bb0de3f---nikililidinifavuw.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8204bf3b0---jegakimefumonuv.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/vogojofadigap.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/13575740024.pdfIn PDF document text
    • https://citronel.com/userfiles/files/zoreriwavoguw.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/lomakinolobete.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/90001177423.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/9f72aae8e63a012bab1c7a790b740d3e/podetewor.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/0vu2dbbgmk58bm5pl2423gp2eo/develevemover.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/c61dohadn3s3534lvv0p2ruo0j/mafese.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/12903945199.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/wuxulelukotigolinezibosi.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/24a7199353f64ea122c48d5a48240021/jekazasulurokezit.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d91d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF134 11052 bytes
SHA-256: 7f617f2e03c092aa0b958db88da32d2275b5911c0cf6173e8fa8691c53f0f6b7
font_02_sfnt_off00010abf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABF 18988 bytes
SHA-256: 3fbcfa467a1864373d2526dbf967d7cd52e6919d97db4b797d85a4dff1c87403

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