Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eb39243769dda92…

MALICIOUS

PDF

84.1 KB Created: 2021-06-28 06:31:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 626e07a8733d052b7cc384ba50358465 SHA-1: f5a963cd82453347ee112bf7df0c25c32fa794e4 SHA-256: 5eb39243769dda92d1bf55937ec033c280e9d806a88ae48c867d369a0aeaddc5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, indicated by the presence of a link farm pointing to multiple disposable domains and compromised WordPress uploads. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://synerhu.ru/uplcv?utm_term=kinetic+molecular+theory+particles+of+matter
    • http://thermcom.cz/userfiles/file/30320975089.pdf
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/dca328abb9d150d21211c648de058702/55827541805.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/0df4bb1717c5f4dedd090447e5d98499/3761763623.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/bijnsfqvgmk58nei0qi2fogtn6/ruvebakibeleludijeji.pdf
    • http://perfekttorun.pl/pliki/78629670979.pdf
    • http://donkaew-furniture.com/ckfinder/userfiles/files/11101441482.pdf
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/g3s5e2i8qpni0pafj3vujolbvp/61479246082.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae48d2e1c5a---20804013100.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/fc01fa9add086bce290d84421c7a4994/xarulaguxovifipoviz.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/ad788a8946a056cba2303b79b8d27b53/32504171027.pdf
    • https://eobliecky.sk/userfiles/file/kozisavox.pdf
    • https://unserbiokorb.ch/userfiles/file/xedef.pdf
    • http://malagi.pl/user-files/fck/file/bunelomefereno.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6af3b7997---41460304659.pdf
    • http://ubest.ru/images/file/mosevoboniwe.pdf
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/valajanarek.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160acffe35191c---vefowuwitopevujage.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/616e1f0be5cb869fd00010babcf4b105/79469967962.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/af32fa4bf5ed522324c5604ab8a66cdc/piwutemobazovukopo.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/9e4726b620ada14158040cff469ec8e1/54387720555.pdf
    • http://thallo-food.hu/uploads/ckfinder/userfiles/files/67709052944.pdf
    • https://heider.ru/wp-content/plugins/super-forms/uploads/php/files/ed867a79c5e04a794d06616a02ff56e9/84598454313.pdf
    • https://ceccarbotosani.ro/userfiles/file/badataviwerimowigodavol.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/c1f6344cf97875f42c605ac5e07ea00c/55833679967.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_off0000e547.bin
31abec34a2538093e3afab7dabeb2cd8c16a6a14d0ed5d3f5d971c1e2661b298
pdf-font-stream PDF embedded font (sfnt) at offset 0xE547 17004 bytes
font_01_sfnt_off000111b8.bin
341c638ddbdd2728493173a1e44fb98ba81dca62a3400007959c2b2b14de8b4f
pdf-font-stream PDF embedded font (sfnt) at offset 0x111B8 10948 bytes
font_02_sfnt_off00012aef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AEF 16792 bytes