Malicious PDF — malware analysis report

Static analysis result for SHA-256 67f77ebfabc44584…

MALICIOUS

PDF

86.5 KB Created: 2021-06-26 19:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3aaf759127807bb15ce28244dc967290 SHA-1: 7b187e156861472cb353e5ce6b80ebc273f9b63e SHA-256: 67f77ebfabc44584d79ff06c934a6dcd5d894d44e2583cff83e4b1f7191b742b
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to exploiting users through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/3824844171291fda367b5d812cfee8a4/73100151159.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16077a53f0d255---vakinixenigogopelojiga.pdf
    • https://denizlihorozu.com/resimler/files/47592936432.pdf
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/5dd2e17c41a64f2af29e4c6c2d0944e8/kumid.pdf
    • https://decoveinvestment.com/userfiles/file/8101611545.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/e1r7usvhescb9mb1go2qijipa2/34311982829.pdf
    • http://supermarketdv.ru/files/file/renunekevof.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/41qgmqbfae00f4khna86v7onlt/puresoz.pdf
    • http://zkojicin.cz/userfiles/file/44256406867.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/u0vi3bmcarmqs026s7a2fs9cs0/pokirexidizelefulixomago.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160aa35fa84b17---kirof.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/360ad870b191bc64cac6566aaaa714e0/18448144464.pdf
    • https://nslogisticservice.com/userfiles/files/78712949330.pdf
    • https://artenika.pl/fck/file/56661986333.pdf
    • http://www.centralperdana.com/file/18737629319.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608389fb26b1b---jededapamopu.pdf
    • https://oteaexpert.fr/cite_imgs/file/27722482616.pdf
    • https://flyags.com/editorResources/file///96975381562.pdf
    • http://giasuthienphuc.com/Images_upload/files/57961426171.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/c544dfa41f955ff3ca4264613b637b92/82803384060.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=dts+questions+and+answers
    • 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_off0000f318.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF318 16792 bytes
font_01_sfnt_off00010b2f.bin
5ddbb25acb49df327b572cee32eb110f772961f49980edd6bc7f95e679c0425a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2F 10528 bytes
font_02_sfnt_off00012323.bin
31024f54f3fa3b28dd3dbc8021719dfa16adf8330bd8b81f7d535146cd724833
pdf-font-stream PDF embedded font (sfnt) at offset 0x12323 16304 bytes