Malicious PDF — malware analysis report

Static analysis result for SHA-256 d35ca6317b51f6fc…

MALICIOUS

PDF

89.5 KB Created: 2021-06-29 13:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 041f6feae835a6759aab03d02e38a5be SHA-1: bbdcdf8c699b54baad2e5e62a706255d12632f45 SHA-256: d35ca6317b51f6fcdea0f2626b3e2332c4744bdc1cba0f5cc0f05272e6a6c306
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress installations. The ML classifier and ClamAV also identified it as malicious. The file's structure and numerous external links suggest it is designed to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/7ad02ce09f6b280650dbd1105c3e91ef/megebumunel.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/mr9j9gfeo0clud36mlfvbqort0/55268717624.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7034cde5a7---vijipe.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/7649453178963df67fe7d003e01615e7/judodikunaxolaro.pdf
    • http://londonjip.com/userData/board/file/kiwagoz.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608312f7a3f51---87953099777.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/3d9bb24cf2bbcecb99ab51f2ef4fc9b1/52367412030.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/b2014178f0af622ee3dd2eade746e66d/bikexexazeriwe.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0199e6cb4---tonunizizebiguli.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/jnh03sumo1nr2cu6n8le1rfttf/jebama.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609966a5f0a19---26369177148.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16082d5a3589ec---3573479499.pdf
    • https://kham.vn/userfiles/file/vexajagajuwodasitosoru.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160c10dc0ac689---nozuvuwipigulidoxil.pdf
    • http://smartvoicecom.com/userfiles/nenokevebowo.pdf
    • http://funperm.ru/content/file/difebigigurarovubi.pdf
    • http://castrolmintabolt.hu/images/upload/file/jivapapevijidolitutuwijil.pdf
    • http://agcslohian.com/userfiles/file/31527331075.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8a2dd6f06---88398756402.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609087aedfd22---79809871986.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160718d2a0cb57---6380068388.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/bb34a96b1a15610d66caf767a8f3dd30/zalogorivavukamim.pdf
    • https://southwestlooms.com/admin/userfiles/files/35694034981.pdf
    • http://shuswapladystriders.ca/userfiles/file/wiwowotixesokaxoxegefad.pdf
    • http://investin-khj.ir/ckfinder/userfiles/files/famupe.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd69e16e00b---woraret.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=thing+in+back+of+your+throat
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9e1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E1 16792 bytes
font_01_sfnt_off000111f3.bin
0fabf64b3ae69fefa06e8ffcfc75215944f04647a09f2e9908f4c56903891533
pdf-font-stream PDF embedded font (sfnt) at offset 0x111F3 17724 bytes
font_02_sfnt_off00013fd6.bin
079d06448ffdd6c1db3061df5d5aaa808ab0d705cce0902824972d82639096be
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FD6 10676 bytes