Malicious PDF — malware analysis report

Static analysis result for SHA-256 408a466dc5d3b108…

MALICIOUS

PDF

108.2 KB Created: 2021-06-18 23:11:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 844a7f77d24e92db4f134d3c3a1c20d8 SHA-1: 0b14d37ffe55f0db3dfc28a18010c9013092722c SHA-256: 408a466dc5d3b108f5c94f1cfea174079338b08bb7c168c60ebc84efb5098616
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create PDF versions of web pages, further supporting the phishing lure hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nomylo.ru/uplcv?utm_term=think+over+cleavers+offer+to+help+you+find+whoreson+junior PDF link annotation
    • http://al-bandak.com/userfiles/file/kafivi.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b64fe460af5---witunegulekesulob.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ebd556613---33197868882.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f197346395---rajomidavuser.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/qpdb7hnsln8h8u0rc5sg0f5qg6/49616283312.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3fa42e609---67105629153.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a99a6ed2c3d---13031970921.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/4e013ca88b20566ce59afdfcca0fafe4/nedoradutimefi.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b826020b9---pubenajo.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/jalisu.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a72509ad64---kizarimifajinif.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908e52e463d---siwumevoniganopadel.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/jinefozuxesugozuda.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/6da8d1b1b2fdbbac15678ec6a7d5231a/tejafo.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210610/210610020418088203uf9wf9xriaup.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/xekokojegiminofuro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off00014faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FAF 5588 bytes
SHA-256: 4595d241038ab93b8f1a3e6148373806477ad583b3f51d65f73f500e4bdbcaa2
font_01_sfnt_off000162c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162C8 12236 bytes
SHA-256: 6fc96f625c2800b20fe4fd077f0f3bf07ddae72679ce51f6396e0ae8bf703049
font_02_sfnt_off00018b5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B5D 16368 bytes
SHA-256: e8d52c1692f86b7897d31d6e39e01e178ccd89d8732576f334b9e49ed6521e83

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