Malicious PDF — malware analysis report

Static analysis result for SHA-256 9401aec8f60dc645…

MALICIOUS

PDF

107.4 KB Created: 2021-09-03 15:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 976b46745553de99a9956da9ca5b3ce2 SHA-1: 80c254cf42449626dddcd9be56a71e793e507d9a SHA-256: 9401aec8f60dc645edf25b5841ea96febdcf39890090aeff67efcb14ce3a3f5a
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 0.9872

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://laborke.ru/uplcv?utm_term=au+bonheur+des+dames+chapitre+1+pdf PDF link annotation
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943f16d30ff---tawiminexavawiwavuzekado.pdfIn PDF document text
    • http://devison-matras.com/upload/file/51020947653.pdfIn PDF document text
    • http://kingnature.ru/files/files/mawazot.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/8f07fde475ad7976eaa555c821454ac9/62646193904.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/6568582144.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/d7c43vcdql3afm41tledsp19q2/fusibitonaxitimizojiv.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/povegudanupowurorijubakor.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/tividelijuvisazabisufe.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/bd223aaf4cabd3c9e2124ce0e7dcbd6e/89197328772.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/87135974641.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851466cd553---32279069558.pdfIn PDF document text
    • http://zgic.ru/!upload/files/42258705015.pdfIn PDF document text
    • http://www.miwon.vn/app/webroot/uploads/files/gemilu.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/biraterujig.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607873685529f---lemoromuterizivam.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/d53157f576eff1d47e314a8d23dc017e/xetukekodapakob.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/sulipesu.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/wevawuge.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/79934156494.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/53968673033.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/rosewetuzizalopazobowike.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160ac271902264---xomewuzowezozusekunuvagib.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/mobeworeposufiratomofimud.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/vareb.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/49428445256.pdfIn PDF document text
    • https://tadimtursu.com/image/files/javunozudev.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/37966f7962a117dc45a9c9c12e7b5f8d/14955542546.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_off0001342e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1342E 11112 bytes
SHA-256: ce2ed257793a8cc24002117294d1f7034718afcade79a79f341d71bd40e5394b
font_01_sfnt_off00014dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DC7 22428 bytes
SHA-256: c1c70fed207fa159da4b8bff81b958df9b97981757a1783b9771dc46e5fc8671
font_02_sfnt_off000185e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1