Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8a0502c052164d9…

MALICIOUS

PDF

89.7 KB Created: 2021-06-25 19:43:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2f98e05659675867c5e5503804b0e810 SHA-1: 87a1ca6895db0799368d7dfa374b90f74483c90d SHA-256: f8a0502c052164d9fb3be6c084cadfb92e05dd2e48bda16ae5bced99ca059e95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as a link farm pointing to compromised CMS upload directories. The ML classifier and ClamAV also identified it as malicious, likely a phishing or trojan delivery mechanism. Although no scripts were directly extracted, the nature of the link farm suggests an intent to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/c56b364a39f90a45a2c57f5671ab8cce/89484942688.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b778b2bbfa---35449530053.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b1ed72f03---60037219766.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/d06c3c10d51d9bbf65fdab953fc6304d/72888846946.pdf
    • http://medicapoland.pl/uploaded/file/23807839435.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0f982fd2f---63832150402.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073166232edb---19891619366.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/i4o4tp5qp0gbjtg4flk7gc0pg1/27610244671.pdf
    • http://www.jobsincrete.gr/images/_user_na/file/79681674222.pdf
    • https://gs-hemeringen.de/ablage/userfiles/files/kogijatid.pdf
    • https://umartravel.com/files/fujorodaluzuxorekavaduje.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16094c97050dea---rasitovexovarum.pdf
    • http://x04ydivan.ru/userfiles/file/domavul.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/h0hsj33sdan5j7lia9p69p0m54/jerejatot.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160728104e72c5---lagamiji.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c05b0dc1d1b---bodolujosimemudutenafi.pdf
    • http://phpirateboosters.com/clients/867602/File/jifawesuvameludoze.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/ostan30phpna4oja6p6t0mpem7/96703285237.pdf
    • http://kppzp.pl/userfiles/file/15301422207.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/668a427ddeda9bd1ccb3a8363c2a6f85/jemepupejuza.pdf
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/f9677801af608b036e7cd3387095a550/xezetujaluxoxitunepuw.pdf
    • http://epoxidice.ro/mm/file/77439744093.pdf
    • http://shengnabei.com/uploadfile/file///2021060709460323.pdf
    • https://didacostruzioni.it/userfiles/file/14581385652.pdf
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/91077846448.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=process+specification+in+software+engineering
    • 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_off0000fa4e.bin
ed1a3270ca6264ef951d317117e9ab6f32f23bb38c5e4c6a677273f7b3f2dc42
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4E 17088 bytes
font_01_sfnt_off000126a1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x126A1 16792 bytes
font_02_sfnt_off00013eb8.bin
3d98b3b9d4f3fe767a78e6fff42d50be888637140f07c230d85a971abd77406d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13EB8 10696 bytes