Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2594dd7e9271569…

MALICIOUS

PDF

91.0 KB Created: 2021-09-03 22:06:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8bcdd4c50ca5142b6de9f71c05a128eb SHA-1: dc71f2d271aec92fc13658d9507aa4fb44765e9e SHA-256: f2594dd7e9271569b1f50690f31ba9892aa3982cdf4ee763f312bd6692a63aa9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are associated with link farms and compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crysiq.ru/uplcv?utm_term=lung+biopsy+procedure+pdf PDF link annotation
    • http://marymo.ru/uploads/files/wimufobafajovu.pdfIn PDF document text
    • https://kar360.com/resimler/files/fagakinesalavipe.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/97585551197.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/68917513154.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/mexalaji.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/21352618344.pdfIn PDF document text
    • http://dd-eng.com/files/files/85553678570.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/vgc35spmuf6bef8f1768afou24/doloxepusa.pdfIn PDF document text
    • http://guowangcable.com/d/files/49192704047.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607a235c2c8aa---jutekewebirewalop.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160813e7735973---metiduvezavegefekazorenu.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/64761863955.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/495cfc9012b87e8965f3b91afa794322/dekolevumukekudesofake.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac1edd86d9---leduxatotoru.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/rurofekozo.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160944b5a8a13e---97026955028.pdfIn PDF document text
    • http://cogersquest.com/clients/f/f6/f6194b381802d71b6842d6160e8859b1/File/17586064479.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/fafifud.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089ec898f7db---91721976201.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16075c412620e6---nipiwuvib.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/672c4f9d650c2c7d354d9cca8920b608/jesalizigesufapadejagotu.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/8ccc82e99ca701d8180e42bd67cb31b8/supalufo.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/wobimebosagubokulorapoze.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/83128522f362ac3051d3cddfea48dadd/58214820892.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/45333055630.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_off000101a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000119b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B9 10800 bytes
SHA-256: dfd5693d9ab4f651f93e2f0e02c140d7b5590b9c1c295b33137b1aa8369b85c0
font_02_sfnt_off00013249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13249 17008 bytes
SHA-256: 76f5b913fca1b73b2c2644b28a40c6fff9926a8d821975879b55a881be7bfef3

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