Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b112bb5686c9d1…

MALICIOUS

PDF

74.9 KB Created: 2021-07-23 10:25:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 1efa3349fdfb7b05412a2f831eef6a22 SHA-1: 268111f2cee804ce763dc76de223ac9e5c1012ca SHA-256: 85b112bb5686c9d1250495569c600157e322a3f93daa894ebac65b3f12ac1d12
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV. 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 clean score 0.2081

Heuristics 5

  • 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
  • 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 http://aedelsur.com/contenido/files/kafodaxowor.pdf In PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/8390935f50fa3e811b4e89efd5c27944/zixenoriselijixulubu.pdfIn PDF document text
    • https://buka.ru/sadm_files/baretapiguku.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771fca2b51c---xefajuxuxemeto.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/cbdec4e10c2003466d02024cd0d934a0/titosa.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607022dff03f6---28004602992.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/p1515s8kqsv6l6r33gflt5qeue/56342970402.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/77655e8bf70f8aec43213beaf000ca17/rafudurelezopanaxetesitap.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/99a111d07a0079c0e9c6398afd462d07/58623350628.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/45079441531.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160ae420b9e11b---bimazimosipade.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/bedon.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8qr6aq3fmrr8r4s1p4q51301n3/82945945511.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5fe63f4e4---gegulepofanuxezusane.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/20157350610.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/samulow.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/31185049881.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc7959ed18a---letobeminodarok.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/d9cdf6fbabe69255f2fde1738221d1ab/32223657876.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/ruvafu.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0de139df92---47054478186.pdfIn PDF document text
    • http://gibisch.biz/files/files/bagopiremiwuretulan.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/e68f30897b0461b7df2c7a4f71cf4174/22942011249.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607789729a09f---59261190714.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/59191064396.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/59hs0jtdisfiobuvch8qb3nu46/medimawut.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/d2144423405be9b86d69bb90cc099db2/18302351420.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=human+body+conducts+electricityPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF9 16304 bytes
SHA-256: ea0e8454c1b19175473689ce800ec92406feead160f4f1624085340c4c40325c
font_01_sfnt_off0001074c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1