Malicious PDF — malware analysis report

Static analysis result for SHA-256 b335fb6261d21087…

MALICIOUS

PDF

82.9 KB Created: 2021-07-02 22:38:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1393978277c7ea0fd1ae0de6f25f5484 SHA-1: edec7c6a48e5935756a5fc1204c8489f06578eb4 SHA-256: b335fb6261d21087ee2341297d165020cd66bc475dcc961e768dd3bb9e96a6d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised WordPress sites, suggesting it's designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate a phishing or malware distribution intent. While no scripts were explicitly extracted, the nature of the link farm and the PDF format itself often leverage JavaScript for redirection or exploit delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://pixomot.ru/uplcv?utm_term=author+of+the+bourne+series
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/r2ulcsbc57n4opjg5kll354agt/16306180504.pdf
    • http://frigotechreina.com/userfiles/files/74410067997.pdf
    • http://heizler.hu/files/file/53690136952.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/f611ad1bc9fc78e3012c6fa8e9e7ce48/wajotozi.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/655f166c8a1defa43ed655281ecd59b0/88149214281.pdf
    • https://eviinstall.com/userfiles/files/givegijoru.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6aa15a079e---80279330119.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ca9834f0e---lebuwa.pdf
    • http://parkhigh65.com/clients/4970/File/kowatosesibe.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608698fde21a5---misug.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718f64e2d18---30825422566.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be3c41bbaf---33227930991.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160846d9f932a5---79485872307.pdf
    • http://gangwonbnb.com/FileData/ckfinder/files/20210701_A4AAADC47F0F0A51.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609743b744713---26212673946.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bada1b9920---pazejigu.pdf
    • http://unipsyclinic.com/userfiles/file/20210602201103.pdf
    • http://masan315.net/board/imagefile/file/27291441365.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ba3598eb3---99663460690.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16078bf27410a7---13454641645.pdf
    • http://tasarimak.com/ckfinder/userfiles/files/roxipukivolofuzef.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab2bba4cfb---69795630638.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_off0000e2b9.bin
39e944c1d925e841096a7cff14970f576884eac4cd590768f62b1a258f015802
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B9 10324 bytes
font_01_sfnt_off0000f9f8.bin
998fd657749d1797070f1f7004ad3534964eb84d047c73fd04d0d8fb097d2344
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F8 17056 bytes
font_02_sfnt_off00012682.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12682 16792 bytes