Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca35662475fbb111…

MALICIOUS

PDF

70.0 KB Created: 2021-07-14 10:41:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d2f74913f194cec98bcf57afe924b2d2 SHA-1: b49d077dcf058afa7bf1c990e295f482cb544ae6 SHA-256: ca35662475fbb111e9b45e1a906717107d17991fd85910aabe3df95a03888b99
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier. Heuristics indicate it functions as a link farm, with numerous embedded URIs pointing to compromised WordPress sites. These links likely serve as lures to phishing pages or downloaders for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f77f00b35---fuwagadarobafapone.pdf
    • https://blnk.eu/userfiles/files/15856921783.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada22ecfc4f---97801085822.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7f1668213---bumebo.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4fa7e407a---57484689904.pdf
    • http://businessvaluationapp.com//fck_files/file/35807982129.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d90c22d71---vinew.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/c90bu9olgb5ucu1ihlprk0dutq/41595547740.pdf
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210616_8E44C082AF72E33B.pdf
    • http://allamericannursing.com/userfiles/file/zurajum.pdf
    • https://abofahed.com/userfiles/file/lidopasifipevogajad.pdf
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/86fd4ff9e9d3f2b4eb246415f797c178/48841310286.pdf
    • http://mn-print.ru/ckfinder/userfiles/files/togitogitovij.pdf
    • http://cathayred-csr.com/img-cathay/files/jegoxudipitorexuvefo.pdf
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/32043487.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160729c138f0d3---kaxopukanojalamejexoso.pdf
    • http://lica-mpt.it/userfiles/files/vojenuka.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad302ba654---pezujudotonipezow.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943baeebe19---rurolonovaruputojike.pdf
    • http://cm.blazefast.co/8f/62/8f6290dcb6ece93f9bc4ed560d71fc22.jpg,http://cm.blazefast.co/93/06/930
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=love+is+an+illusion+chapter+46
    • 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_off0000b14a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB14A 16792 bytes
font_01_sfnt_off0000c961.bin
71c58cf1e9a180deb155ef70a7af2570f36066fd58a769a29dc5a5f64fcbfe34
pdf-font-stream PDF embedded font (sfnt) at offset 0xC961 10840 bytes
font_02_sfnt_off0000e26d.bin
ac532cb879cf0baf2964f6f0888dac7d2eecd5ca59844671fecd4f28e883c2b6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE26D 16200 bytes