Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc4fd2b2558882a3…

MALICIOUS

PDF

90.2 KB Created: 2021-06-26 01:57:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 80687fc3a126e8d9e645d618eb565ce7 SHA-1: f452dc5532d3206a8176741fd10677bc69582628 SHA-256: dc4fd2b2558882a35217959a483e8157af10ef6696cc022ba3a287b6c559ef8b
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable domains. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host links.

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 http://akcjonariusz.com/UserFiles/file/43012332371.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724a3d80786---masuvememirute.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/j5697grk6cp2agmt3abkuu4phs/xazovizixalu.pdf
    • https://baxsporthorses.nl/userfiles/file/jovuxu.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/6aa4eca96de70dc427a857fea4aebdaf/61267804904.pdf
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a433e8335---fowez.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608356c5e0817---wuvok.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/51992e7a89c13f7bed07a381c98fa3c8/bawusufabi.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609018f46042d---74072790054.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073aea6b842e---13016385113.pdf
    • http://beloezoloto.ru/userfiles/file/53572708464.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/pvuksadd8871996kls1j0mdmd5/75401610197.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/194db885b9fe89713a4643ec9d9bee81/woboxirozuwopagubavumu.pdf
    • https://cleaner.pl/userfiles/file/zabedetepilox.pdf
    • https://briljant-maleri.se/UserFiles/files/jodutoxelotidovo.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761b0bc859d---kalawomofipavanojilovi.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/af46f7c1fee9c2cfecbc3ddf6565d283/84084886531.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf2fb6f20b---fexabudo.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d22fa22c58---sunabelivo.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/6771c3523208dab5b153eabcd20b51b2/lewededewuzipivamu.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b555e9f0212---fajukijoxizonodaneko.pdf
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/98510584854.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/119e4ea54d5230d3d1cb3d375f3cf645/vuxukolexofusapalup.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/acd4ea6d2559c18e3a3316a722778ca7/xabuxudemidedi.pdf
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/nomas.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+compress+pdf+file+to+200kb
    • 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_off0000fcfe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFE 16792 bytes
font_01_sfnt_off00011510.bin
3847b571962d210c8904431590468ae85d2bbdbce859e7b64f83e142a6a3876f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11510 17280 bytes
font_02_sfnt_off000141d1.bin
d3b3ce9a83874c91ddb7db031d8bf007c52b5e6c84a079067a05550c64487153		 pdf-font-stream PDF embedded font (sfnt) at offset 0x141D1 11068 bytes

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