Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8bd30e08348cd47…

MALICIOUS

PDF

88.5 KB Created: 2021-07-04 17:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a4befdb2777b1b9f07988ad8a092c983 SHA-1: fce6d0598550a686e5a876977e3cb76166b7c212 SHA-256: f8bd30e08348cd4749e1eb4ed4f4720b67d0c4c8c2864a6049c74cf4bd5bfd83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function appears to be redirecting users through a network of potentially malicious or compromised websites.

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://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/a4365f74b54ad5582b9434e7fe9dce02/36359679677.pdf In PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/8b14c78818f86bc6a5587dda4aa4a64e/87652384898.pdfIn PDF document text
    • http://short-story.ru/upload/file/90574660925.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160adfe880738d---4048094796.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/tokapolegige.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b171a2124---jepuxodosut.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8b5d58376---62850805639.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/lujipe.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/42556284537.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/85799902749.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/zekebasirus.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160be7e5ebed44---92280884604.pdfIn PDF document text
    • https://congchungnguyenlieu.com/uploads/files/vupovajem.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/ce97ca3ff0c9f305f2a8d47c305748e2/navezivew.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/nizazakedovezujekekuzuja.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4095556ae---3715283662.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/rikoda.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/uf1rnpnio4iamgb5oajkreifo2/dunevogotojodepasedaxidor.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aa90e20a677---zekerekidurimimuze.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/e2df5f0b5a58b94815b49c1d8358b7c0/dufusexakusakadenezi.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a575ec87f4---24220396852.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/ntbs40a349v5sq2s8n8rtjo840/rifupixisejugub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=lonely+i+am+so+lonely+originalPDF link annotation
    • 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_off0000f1d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D7 20400 bytes
SHA-256: 4f92e5b342ebc2f9ecfeb0856c715f8888dd8a4bda044bad9ac8bf5803e70c69
font_01_sfnt_off0001256c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D83 10424 bytes
SHA-256: 4613e88849ac57d702d2dbd396e4c31ff0793ccba9e464cf9eb23b41cb9a9012

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