Malicious PDF — malware analysis report

Static analysis result for SHA-256 d56a15ba10134430…

MALICIOUS

PDF

87.0 KB Created: 2021-07-07 20:14:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6e49312a19dd45024ee440b09fe31201 SHA-1: f3184f58ea018df8d3a3b8d7d435db6f9327319d SHA-256: d56a15ba10134430efeb51ae345abbafcc346bcc2d842291aa839821477fd7ed
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to lure users into downloading further malicious content or submitting sensitive information. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/d9502c326c014b7e03183832fdcf088b/mufenugopomosara.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c86e6b9d6c---fewutudeputilujida.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/7e4cb0fc8dbd2501eec0a28d58996950/dazuwitesutim.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b82334d97b---niboluwas.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/lh94o80cuv1edgva2p32koj2s0/jojopusefafuzeramopisu.pdf
    • http://thecreditcrisis.net/clients/73966/File/josabijajarezivaxobovipi.pdf
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/tuwugukinijozagijimukik.pdf
    • http://nousgarage.com/userfiles/file/rufabugu.pdf
    • http://softwarefactory.nl/images/file/joxafesevosetuben.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/fasegoxufegilotulezakuka.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c948f4c9686---kaxopubetuwomuwevuvo.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afcd9da4e23---36024218808.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cf6561ef989---petuwurenutifizapufoxuzo.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/a3833c8c5d11308ad78e52b07c98b9bc/74768586663.pdf
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/125f58eafaf8d2b9d44a4a210d4f3d3d/nulor.pdf
    • http://microlana.com/ckfinder/userfiles/files/9054762581.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884636cb260---tewupajumir.pdf
    • http://antansconstructions.com/ckfinder/userfiles/files/wixirabafamujanoruzebomoz.pdf
    • http://jfe.hk/userfiles/ziwagumujowaselidanabo.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/f1c7vgukdb6bredlogp2al4eh2/vasoxamesagakuget.pdf
    • http://akcjonariusz.com/UserFiles/file/dipuxiperil.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=relaxing+and+calming+music
    • 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_off0000f067.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF067 16792 bytes
font_01_sfnt_off0001087e.bin
5969b85998fac99a590bc8f38da49985ca7d9ee87837ff9a6d624737d139f7fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x1087E 10640 bytes
font_02_sfnt_off0001208f.bin
587ce0ba16de1dc353c7e725b20d85b165c293f83010f1203b66ebb7abfb2749
pdf-font-stream PDF embedded font (sfnt) at offset 0x1208F 17732 bytes