Malicious PDF — malware analysis report

Static analysis result for SHA-256 be2a4ab2931afe70…

MALICIOUS

PDF

95.7 KB Created: 2021-07-08 05:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3be8a82617854c174540bcebfe194bf5 SHA-1: ac47e0fab05d04fa49889e123de125a61ee45e1c SHA-256: be2a4ab2931afe709de65fb582b1cb5f0c73da502426f7ad6a5fe93da1abc934
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://s-privod.ru/userfiles/file/xobivevoselupavisibemuw.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096e80226619---18199297566.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718255cface---90460239050.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/9f80667f61e317f1a012806e515b1aa6/83628665824.pdf
    • https://hophamthaibinh.com/upload/files/momokel.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/2kpblqroh2uf9b8vsirc55qg64/nujigidibuxekogamiz.pdf
    • http://klefmarken.se/upload/file/molilokedavabujo.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080af3f1d1aa---70993577743.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/gtil1pg97bql3u5a0064h3f93p/rarevowugisemoduge.pdf
    • http://minhanh.com/files/40862029950.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855079c8b94---rususuf.pdf
    • http://mishelik.ru/userfiles/file/basapuzonudemuza.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/188c5d17fb1ba2c4f1d33d8530c9fb4f/58273894098.pdf
    • https://profix.fr/ckfinder/userfiles/files/2874501185.pdf
    • http://sehs67.com/clients/e/e0/e078d4d0076166a7bb489ca3b3a583ab/File/getogofuwiwewaresobo.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0b252cfe7---kuwowon.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070801d061a5---pununofumarizakewomi.pdf
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/89365997954.pdf
    • http://nfc.soo.jp/file/82986612445.pdf
    • http://gptools.net/userfiles/file/88920945756.pdf
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/798e632ebbb556f86c1ac202f8119888/vededine.pdf
    • http://vattucongtrinh.com/userfiles/file/81798308302.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=neon+pink+and+black+hair
    • 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_off00011490.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11490 16792 bytes
font_01_sfnt_off00012ca2.bin
d77e553258287b32984d3982d8449d0d555ccd5f723eca6b852887a11a2827e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA2 17508 bytes
font_02_sfnt_off00015a42.bin
bdab96a5bef32d4c616e368267c9bb6a65d5024ff41129f7996f92cd404491c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x15A42 10556 bytes