Malicious PDF — malware analysis report

Static analysis result for SHA-256 f94460bd49e20e60…

MALICIOUS

PDF

91.8 KB Created: 2021-09-06 09:11:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1f221e09ac1ca3a68373deb12152bd0c SHA-1: 08c3b5cef14505618c1353bbf8926d65d28035e1 SHA-256: f94460bd49e20e60236f0b33af4bcf3a1ada7b5bdc05c9e49332504ad824b5c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and appears to be generated content rather than user-readable text, further indicating malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ketchas.ru/uplcv?utm_term=dell-thunderbolt-dock-tb16+user%27s+guide_en-us.pdf PDF link annotation
    • http://alphasigmaoverseas.com/userfiles/file/xuvitomuxitifepodidexori.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/887add19939bced055ec3483a15506ee/75674900685.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/c692147d5d4af70fe523e836a6af619b/zubaz.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/fusagixifari.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083cca3314d1---53246191903.pdfIn PDF document text
    • https://kuepancong.com/contents//files/99186983129.pdfIn PDF document text
    • https://rcot.org/userfiles/file/54109488242.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/20222049407.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d2dc260c866---suxenakegatizapurevogazap.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/25243736944.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/28829175841.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/23hspur74fhus46en1oma44vf7/xojojunotulutipofoforepo.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/fasurajubos.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/duwubexuzidodaforulaj.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/59676939862.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/86fa8abb9a3ea32dd06451d6ab2aa54b/40984143642.pdfIn PDF document text
    • https://palet-school.com/files/files/25171753153.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2025586bb---vejesa.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5a829a02f---zapufojizabosabese.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16073d9f4c035d---novarafawezatagezemaxu.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/83088890660.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c32f1042950---genebasejufuzubo.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_off0000fc63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11475 18880 bytes
SHA-256: 705e9082ef6423078c6c0b3c627adf508679df8113f9a0c78d13aebcafb79436
font_02_sfnt_off00014617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14617 11456 bytes
SHA-256: 7b110da3c1a12b96d0ab61e6851fa0aa7f0fc0cbc82c5cd0d69f4dddc0ca388a

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