Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2524467f68e2882…

MALICIOUS

PDF

80.3 KB Created: 2021-07-30 08:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4da148797f16ae46a1e5448a57d7dcf5 SHA-1: 1a3bea6668a56c946ebad74375872c698f8cbbe6 SHA-256: d2524467f68e2882b60862758b452dba9035517b9379f05cf8142198399ee39b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://drafthe.ru/uplcv?utm_term=metodos+de+obtencion+de+alcanos+alquenos+y+alquinos+pdf PDF link annotation
    • http://bjaimama.com/data/upload/2021/07/file/202107060049391296.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/rozubulupesijubuwe.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/meuksko6qdnn8m180l188ulmcv/53697726066.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/64840177524.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778d3c26839---70374131371.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2dc5398459---16891470351.pdfIn PDF document text
    • http://vodnik48.ru/content/file/tujarupewubexexagaf.pdfIn PDF document text
    • http://billsky.ee/files/file/jogemet.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/totanamukaredi.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/putekirulapuxemovoriw.pdfIn PDF document text
    • http://juentai.com/userfiles/files/71094478096.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/d6467f8979ac84cb5d0499db834c394f/popaxajaxipuzofaf.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/5702115880.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab01e6be86---matopufamajawagesexoropo.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0f9bda69a---43848701431.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/f3e45b4dde5d80723809baf97ccb8c10/besazisitexomolavolu.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606db86a97d58---radavafibo.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a22a18ad415---feboxedejusinonev.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/15829732820.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/fu1vi31o8v4lao2eqocsrlj27r/bisugijilaseran.pdfIn PDF document text
    • https://ubranni.com/uploader/files/zobufixovomukupabobajupu.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da60ff0664e---56657471892.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/f3e21f1c301b2a1f50a781e0451bae00/mesimaxadelajodetixiju.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/d7e2da0582cb126ecc3fb1415d60acbd/fasibereranosasusarosol.pdfIn PDF document text
    • http://coumert.com/images/file/muken.pdfIn PDF document text
    • http://ibb-online.ru/f/file/poritixo.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_off0000d14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD14A 11004 bytes
SHA-256: 96eb632d537f50fdab3b2fc58121bddcbaac05d5f44a1159a728a07b582d3151
font_01_sfnt_off0000ea9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AE 17832 bytes
SHA-256: 9ce6981c5f37fe1eec59ca709b5b1272a9a07741d9db640c23c0a6a088aa2207

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