Malicious PDF — malware analysis report

Static analysis result for SHA-256 b513db7f4906a9b9…

MALICIOUS

PDF

83.3 KB Created: 2021-06-30 10:37:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ab1a847680ff3dbfbc12876310b5a9dd SHA-1: 8492879839fd513426d76af3eac950fb9694e6f0 SHA-256: b513db7f4906a9b9e3fa3d28fbf9b8819277cfd2ac9ae87b4879d6f749b4842e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to host malicious content. The presence of these links suggests the PDF is intended to redirect users to potentially harmful sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607dddb643ddb---jelosovekusi.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe03bce5f5---woterelivi.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/0af617373cfba9a921b3383e8aeb9b4d/94485460992.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/bsgeiv58oqjs63iifa7tc4cne5/netovonawuvu.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/6ca657eddcc2a8529c810ede601a2ff4/76512169417.pdf
    • https://gelblighting.com/userfiles/files/winug.pdf
    • http://mikomisushiwc.com/uploads/files/78474910498.pdf
    • https://comobrew.com/newsite/images/user_uploads/file/88598285461.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc735b731a---74673450112.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/rm53t80q2jpotpqpa90pdb51lj/53846677221.pdf
    • http://adria-ex.com/images/blog//file/3408890242.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bdea017a32f---kuduxesemugedegorelebege.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/2da0c1de52089d49bb64faaecd5e074a/vabif.pdf
    • https://medtek.vn/storage/file/12343717977.pdf
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/sifadefagif.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16070b36807f2c---ronakinerok.pdf
    • http://logiccpacma.com/ckfinder/userfiles/files/67023620108.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/a7c6b4fa707b6fff2d678d2cf31d5fa4/fojasazupudexemi.pdf
    • https://atraba-holding.com/userfiles/file/bupeladizobulebonel.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c526097398d---48914755839.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/fec906c08d957d402cdb481a29d647ea/84343920245.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b066e9c195.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/67c835487ee5ef4dec4aaef6ac1d2385/56975513234.pdf
    • http://lahma.pl/_u/userfiles/file/wadufabesezipulebev.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba30f3e20---panew.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=burgers+and+beers
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a21f3a0e219---62076461031.pdf
    • 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_off0000e19a.bin
61e48c0d0c0f34e76f434426eee8536373e794f322a7b7adc49a713b40ebdb4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE19A 18528 bytes
font_01_sfnt_off000110a5.bin
93be61bd90399737d56a94ef397970a344b503d69ed98e6ea81786c4cf3dde95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110A5 10360 bytes
font_02_sfnt_off000127f1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127F1 16792 bytes

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