Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6d0573a886f1c4e…

MALICIOUS

PDF

89.3 KB Created: 2021-09-01 04:09:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 544f7ad3546226e424b4f43089bfe52a SHA-1: 357e1f40cc13a3a03f6f2dd995eca511c79ad007 SHA-256: b6d0573a886f1c4e46a8d5f90500729ea2092d1ec1f436fee04baff31efc3205
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/14398ada0461d553222f41e5f06b6694/62586361215.pdf In PDF document text
    • http://bronia.org/userfiles/file/vuloxeripilurimo.pdfIn PDF document text
    • https://fl-forever.com/upfiles/editor/files/pibizixovukokegonel.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/83467609317.pdfIn PDF document text
    • http://amesonsofallen.org/clients/53156/File/91110249480.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/tiwigepopivesupuxu.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/d2fe875c49505d6e23ddea3187aa8356/8480777214.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/55261506858.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/6476eabe8cd903bf3a0727a585dd8ddd/rilujazokozavufivaxasones.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e31a233dc---vawipiforurofiwakilomefi.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/ea385c8532b80b4aafb97316baa84a69/58470642896.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/dcbc8afa583debde31f4ba1534b028e6/13741144783.pdfIn PDF document text
    • http://novichiha.ru/pic/file/rozuzufuperifetika.pdfIn PDF document text
    • http://yongqingtech.com/d/files/4488831131.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/651c6118da130b75170ee9554d5d610a/zatosexorubusul.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/82182ca34d43b95d07315864473c35e8/66775948111.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16107e2b607d76---wujuwenilasarizo.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/19742272766.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/sapupezanufakanegiruxa.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/25cc3c40334801cd56f068215c6e744c/paseborisomemorinoni.pdfIn PDF document text
    • http://candientuvibra.com/images/file/53072456187.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/dewesamefigefep.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/rugopediseverovakubaber.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/35362005346.pdfIn PDF document text
    • http://laduses.nl/image/file/ravojosupabejapodaluxez.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160830d8f7d1ee---ketegojebilifes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=high+and+low+churchPDF 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_off0000f750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF750 18844 bytes
SHA-256: 530437648fe34cffca3a4790f2b7ad08c81e82ed66c4c33cb1255f2c58ee1108
font_01_sfnt_off000127d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D6 10428 bytes
SHA-256: ec595fc982d4987af394145a57f595fa996df5b36c09b9e3d8e3b16213cc6cb0
font_02_sfnt_off00013f20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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