Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cc3cce4e5c67f40…

MALICIOUS

PDF

81.9 KB Created: 2021-07-06 14:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6a58777b9686b0e6b02c00d89439b387 SHA-1: 8270cda1ad744b4ceeb6390e3426276152db34bb SHA-256: 7cc3cce4e5c67f40979ea1099b506a081d827af659e7d3e132eff4dbf74748c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm pointing to compromised WordPress sites. The PDF contains numerous embedded URLs, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the PDF structure and URL patterns are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/0dd767e9c8cb42a80bb2b2859583ac36/vemusir.pdf In PDF document text
    • http://szpk.hu/_user/file/jovewebosipirodulitesak.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/88333381465.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b73fc7e6ca---77893915292.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/2f3705e27c8a8a3fce448a3d387c013d/sotexadamogobuxip.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/33200cce6dc1f16a37eccaa0362f7287/fubusasanebezevoseroluriz.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/21798343437.pdfIn PDF document text
    • http://polkovnik.su/upload/file/47018839460.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a980b72c5ee---21153983777.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/85773427388.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/45721214564.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/8f26e51622973c82da3f575eb0252273/gasojimuwawijerujuxabamev.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160901071b3412---449965316.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/8ac3d584471dfc88bdd7c839379aea0b/sodemenipud.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/50c2653ecc48ea3d90831bcf32708095/24102747466.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/pesefi.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/65eb47f04866a59338a0ff8218154cd3/4141368245.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/8a0038af50157c629ef9b7958d68c11e/79669019931.pdfIn PDF document text
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/8d2664d2ad197ad128c559906d0de65b/42034451762.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/sepitevinix.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/86034992873.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/b5ih3kcmpin7g55ned6qp97n62/genojovapimofezilinufil.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec977bf1d2---togupexo.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/xumofuk.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ec35930ab---penebixubodinomagetebafif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=removable+and+nonremovable+discontinuityPDF 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_off0000d8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CE 17836 bytes
SHA-256: 738268d2208cbe8c7142a59ff20e3044953376c5fde44d7d3233e57f65e60dde
font_01_sfnt_off00010869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10869 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12080 10996 bytes
SHA-256: 811f31ed8713eaa1ad632c8d7db8835b1c3de8d9e99fff73fd948b5895da4b43

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