Malicious PDF — malware analysis report

Static analysis result for SHA-256 3471894bfac2185b…

MALICIOUS

PDF

96.0 KB Created: 2021-09-14 12:33:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fd8382cd341fc60afa039a1eee62f91c SHA-1: 8677a441e09895b5f69494b3a5724bd39b6d7f3d SHA-256: 3471894bfac2185b6dc4fd6f9b6d96e7fae0457ec858d01a374c3ed6fc6ac9d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm that points to numerous URLs hosted on compromised CMS uploads and disposable domains, suggesting an attempt to distribute further malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9879

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c6dfeb7d6---kegokido.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdb29794ce---zexalagesova.pdf
    • http://archpiudue.com/userfiles/files/21812604145.pdf
    • http://tanphatinst.com/vietkiendo/upload/file/pafujegejeg.pdf
    • http://riph.pl/userfiles/file/rufubaloxeve.pdf
    • https://onsale.social-push.cc/data/fckeditor/files/9957726959.pdf
    • http://www.sport-konyv.hu/userfiles/file/45809524313.pdf
    • https://crownprolaw.cn/userfiles/Proj_Name/files/rosax.pdf
    • https://vantainoidia.vn/ci/userfiles/files/voxaxakimud.pdf
    • http://dansungsala.com/uploads/files/35112312994.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e855e4bbe---26408354029.pdf
    • http://dulichtantai.com/files/uploaded/files/88357786339.pdf
    • http://onmamtour.com/FileData/ckfinder/files/20210911_922030744D5253E7.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/3730714bf89812303109644e31772c17/23260974949.pdf
    • https://listapp.in/ci/userfiles/files/65098786450.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613a11509f246---71894189396.pdf
    • http://twilaw.com/files/files/kibukut.pdf
    • http://limeitec.com/upfiles/editor/files/59071138431.pdf
    • https://soudurelausiere.ca/upload/editor/file/rizumar.pdf
    • http://stellar-toys.com/ckfinder/userfiles/files/wagaze.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132462ab43fc---kaxolodexofipogeduguvok.pdf
    • http://petgears.com/app/webroot/files/file/wigivoxalaxuwogevomelelu.pdf
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/tusovalexekudisokefex.pdf
    • http://sgo-bage.com/public/files/files/gulogixunilopi.pdf
    • http://21cedu.com/pds/userfiles/files/vadupikom.pdf
    • http://veterky.ru/ckfinder/userfiles/files/liwawerelolozija.pdf
    • http://vietsaovang.com/uploads/userfiles/file/fetemozus.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=sao+alternative+ggo+fuka
    • 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_off0001111f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1111F 16792 bytes
font_01_sfnt_off00012931.bin
8734f31b5131e625bc9dbed6f222eda544ad0da310dfe1ee4e34e16cb9a7da29
pdf-font-stream PDF embedded font (sfnt) at offset 0x12931 18864 bytes
font_02_sfnt_off000159f0.bin
26d48dc8c8d0cd26b3f8ba743c1975d4bda4c9cadd296a4fd37d2cbdbb9f8a26
pdf-font-stream PDF embedded font (sfnt) at offset 0x159F0 10556 bytes