Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cf0e33e743f4975…

MALICIOUS

PDF

146.9 KB Created: 2021-07-01 14:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 14e34cb29c9750f14bd4aa2a68b7f68d SHA-1: 5c017e5d2b2eaecdca2fc64a133bc6f40911af09 SHA-256: 5cf0e33e743f4975b911c8acd78d6b9df6d36280b282a14b73825dac36c5d052
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external websites, some hosted on compromised CMS platforms. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9733

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=are+cash+tips+taxable PDF link annotation
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/3bf0d2811abea5503ccdb90a097e5b0e/18624583879.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/b12221f3fa00dca56af047358fd1e9e2/63215355387.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc42910b96---7309573304.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/80721286372.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608456c7c8a0f---10741231713.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/naxakovisiwebila.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/d3a4f6e14d0bfcf76ff8c9537d154181/fopepedo.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/6395640867.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c1d08d2d9---14500097662.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/sogawuxetujuvoduni.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/094c2db5a6fab6b756a54423da6a354d/muketexebelirubema.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea65153281---zavefitipofono.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/52135118579.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/xobukixipopupowerofikitax.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/8459da01fbe229c278c4fe190344436f/wusawiwesonasesububuzizuk.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/f23c20c17f1d5efdf920e8e28df92f80/58686654992.pdfIn PDF document text
    • http://toastwarenhuis.nl/app/webroot/files/userfiles/files/98618685011.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/t1ffldjvbha8e71uqm2inrlc04/11480877724.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f870010212---99412790117.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///kafuleziwesikajafoje.pdfIn PDF document text
    • http://bigpictureresources.com/userfilesbigpicture/file/romerokabutovavenazeja.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef5cf2a0f9---65789653570.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/d538muvv5lu80769keiuvprob2/xoragafuvumaxeliparo.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/74697771922.pdfIn PDF document text
    • http://asustainable.com/global/file/wuroruzisenejeb.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001bd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001d583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D583 16708 bytes
SHA-256: eb35cb7d3a71b6c295f97cdd45c7cd9fa23affeaa9aed19aadc8c0277c7bdb72
font_02_sfnt_off0001ed05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ED05 21692 bytes
SHA-256: ab4d98aa57033cdf96e7753548447c1a32adcfcf9a9e20222526684e8898dd0a
font_03_sfnt_off00022465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22465 10468 bytes
SHA-256: 772eeea10a50baef90ff1ba784bed6e8568cf8ec1ab5c3faa8a46a28db2f9dc1

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