Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b970b7fa9679140…

MALICIOUS

PDF

87.8 KB Created: 2021-08-02 02:07:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 246e9476ca4dd80253c3e5f308a35bea SHA-1: 367b0f82f92b4ccc874db336ceb96f259673525f SHA-256: 1b970b7fa9679140b290fba9a54b6f787e1e7a921658e8d959d4e6b4389dbf45
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure as a link farm on potentially disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/b9e2ac140ed48efad8845c0a14754243/75917128944.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa09b0438d5---70239885352.pdf
    • http://automozg.by/upload/editor/files/58047967917.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160dc94fcb57d2---fesarib.pdf
    • http://riskhedgetech.com/uploaded/file/15626443460f5868a5bec4.pdf
    • http://tindangnhadat.vn/upload/files/39449925445.pdf
    • https://aradmissions.com/ci/userfiles/files/mefolojubokebok.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/9aivcebpm28takufeu05dhgpan/7413810268.pdf
    • https://alajuusa.ee/media/contents/file/30811341644.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/52dcdf3b730d274ae3d2b98228f6d693/47970300316.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/mfrjaa9ts4tle26viimrj6julc/pifeneporokalevumix.pdf
    • http://krevue.cz/UserFiles/File/55495197520.pdf
    • http://aucoindeshalles.fr/menu/file/namusopitopaleg.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e2622e01a---saxirowomenulixenatenowi.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098eeda9fcaa---10151825814.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160e7b33e845bb---jotuvubopusudirunipul.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/7aaf46d325c643502639f96464576c97/namopuwetawosoxuzaborij.pdf
    • http://angelcabrera.com/FCKfiles/file/toxor.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/4d0dce548da2cf546b963d33e8f350f2/62627569177.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d8296334f---97927910897.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca1c6ccedbe---lafurezozejijiwig.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc2fe34a87---10005328233.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/faef38fd836a09d168054da2220b114e/57547632661.pdf
    • http://monroehighwildcats.com/clients/40160/File/timajet.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607998706c3d4---32942340417.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=learning+english+language+pdf+download
    • 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_off0000f28a.bin
4eeba014ce6ee63000ec6776a45e31a57cd5819059fc72331dc5d3160984a753
pdf-font-stream PDF embedded font (sfnt) at offset 0xF28A 10824 bytes
font_01_sfnt_off00010b34.bin
818394c7e64320dd6a13cfca754d9b97a3d159dc7ac0e38812e0b83dc716363c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B34 17092 bytes
font_02_sfnt_off00013799.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13799 16792 bytes