Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c0c1a526674863a…

MALICIOUS

PDF

89.8 KB Created: 2021-09-07 11:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 047a6f7aa54d39798fb68f811c13a872 SHA-1: fe96659db38b3324e8e5653ebe077d8e1ce0230b SHA-256: 9c0c1a526674863aeb1a6b3d9a686afc2b64eddd5e6a9a1c3b20aa2a3bb7163e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous domains, many of which are hosted on compromised WordPress sites, suggesting an attempt to distribute malicious content or conduct phishing. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking clear user-facing text but containing embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/de884df3a1e0bf626ebbe17c930e0df0/xetuditarakejuninoda.pdf In PDF document text
    • http://busangh.com/attfile/fckimg/file///2021070219218_922230575.pdfIn PDF document text
    • http://csp.hu/editor_up/lanudivujowirutosatudepo.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b11e7559167---letixirosemobofiburu.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/ca70f994c19808dedac8f0eaa6395f40/sibedakuwimiwumolupol.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/o0fi6mlhvo9mj5uh9431g51ht2/wapev.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160965970271c2---33767089380.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/0fcf66ac7bea890b0e8cbdfcbd378e89/36537841526.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/a9d6588ef18f2a1d94e19207ab382482/70110254589.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/dddde250949b564163eab0469eae4399/84358106519.pdfIn PDF document text
    • http://quaint-house.com/datafakidaginozupodo.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/71057446928.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/kulexivojef.pdfIn PDF document text
    • http://mousike.it/img_ins/files/gibujuxad.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/94430731537.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/915ee3f1175962d76d6a3143d919ab51/53684583909.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/92522024520.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/sirefap.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/nibarawuxepidupidu.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114d3e055bf0---pidujanikefupirapeb.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/79188253336.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/fb5e38ee6c567c6e9c08e2d1f74d1471/82146378276.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=ejemplos+de+examen+psicometrico+pdfPDF 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_off0000f4c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C9 19724 bytes
SHA-256: 454e7c736ad86930b27fdd482a1473c5b55b7b563932897c84dfa7ca6cff3fce
font_01_sfnt_off000127c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C3 10996 bytes
SHA-256: 0a03d3bbf5705db8f711ca6d00d1832212db4b3b39ede4873162994357d7e288
font_02_sfnt_off00014144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14144 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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