Malicious PDF — malware analysis report

Static analysis result for SHA-256 36e92d522a0860aa…

MALICIOUS

PDF

87.0 KB Created: 2021-07-16 16:18:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e9180e5d6ab1e7de2a87ffaad1f11251 SHA-1: 0470f2e0f0d1c2cf8a91f2809f00cf5544feb5ff SHA-256: 36e92d522a0860aa5fc35b92e3442e2e14225181b3d8996c46d2355d9208725f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The primary purpose appears to be directing users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://chcial.ru/uplcv?utm_term=how+to+craft+a+monster+spawner+in+minecraft PDF link annotation
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad92491a5ae---1997905197.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1521692fe---jopivasolajifeferigaxibo.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/wogera.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/14177239490.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/fujerojomo.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/e2ed2a93c3e49ba31f6899376503a4d7/fenowasaxipusufegu.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/70736396431.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/29522148029.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608778d852e3c---43867561903.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/54ddf8ab094b37c7371e12377fe4ea6d/lebosujagoraregez.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160c8715ca5568---nuxajogewikebokubi.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077f7772e065---wizomugilofa.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/32529607589.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/rabawabakew.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607861b7de216---jotorizibu.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/45669684387.pdfIn PDF document text
    • http://chieucoingason.vn/files/87033059382.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160848b01464bb---tevikarufibiziponunor.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/p031d418utvvg6sca13qvmktbd/52063729027.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/timt0obqufbmhj5pceo8691s5a/6039130156.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/97624067359.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc075580d9---46163459262.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF254 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6B 10672 bytes
SHA-256: c62c7a8b3a71100e549fc20ccd4f904aed41abc2c2f2a02b31b3cc7cee46f466
font_02_sfnt_off000122e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E3 16924 bytes
SHA-256: 593fdb09b147aa234b3361afaf37b6f0ed1ede6358d5b1f5f0d440617cf334a5

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