Malicious PDF — malware analysis report

Static analysis result for SHA-256 df8e2623315b1c9e…

MALICIOUS

PDF

89.9 KB Created: 2021-08-10 07:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 3cd67bb61d7f6e4e1fbb0ab7f83a0a20 SHA-1: f8eb1bd0bbf8995812bb835b4588f4aadf081808 SHA-256: df8e2623315b1c9e04f936c31116b1a6333fa7ea921687c2ef6db4a7607c1144
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/768ca43bb0beaf39eaa37b7ed3561c3d/wimedakutokenonixipakifiw.pdf In PDF document text
    • http://nuestratierrapremios.com/campannas/file/27317562878.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7c2b92aa8---52634716678.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/miligibotadalalopizomozu.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/84586307728.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/245017fb74a36ea998304d6380309687/31927001507.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f02faafe43---47717739989.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/fujenala.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/a56d8d7bf16277429ad790eaf52b55fb/futajutodanuxeze.pdfIn PDF document text
    • http://xinyuemu.net/assets/202106/files/20210604215710296897.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/ed5353322cbaf43d497c35bf29742d4a/65027659769.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160af4e2b005ab---livenisaniwufoxevolesip.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/b8d0128c85ef20d858e25da840f5cacd/3269893029.pdfIn PDF document text
    • http://schnauzermountainminiatures.com/clients/17729/File/jekevuxar.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/xolasan.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/92965a9f44498b065452a4f3ccd58853/94713775478.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b024ce603209b25ce381c8807cb5a89f/57588789874.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/7datk33me2g90cudl2cnpa9r4c/bubunesabeludojupaxojirun.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160ca8d046f2d0---8080430894.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/31013256329.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/22182377043.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081be458980d---38780937508.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d079224c51---davatugegi.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/42145189202.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/0fba431a1d0229755faa260115162412/98720706293.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=blank+tri+fold+brochure+templates+free+download+wordPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA70 11356 bytes
SHA-256: 77c4e0d61b756c747bb567d0db66f5a724a048cff6fb122c03421f10106911c2
font_01_sfnt_off000114d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D6 16828 bytes
SHA-256: 730e1a4726e60e5f0178229e8ba75866927948d2d3f0a168d9d2701e9c56c261
font_02_sfnt_off0001401a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1401A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1