Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bddda6661b5f974…

MALICIOUS

PDF

91.7 KB Created: 2021-07-01 12:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d33a5b8e869a143b015a0cfb2752c596 SHA-1: 342de87467adb401e9298d1b876d7f85bbe09083 SHA-256: 2bddda6661b5f974747cf34fc0fa1a8f6807d22190160f8882cbf42d6d13a291
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm pointing to compromised WordPress upload storage. The document body is heavily obfuscated and unreadable, suggesting it is not intended for human consumption but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9764

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://catamma.ru/uplcv?utm_term=how+to+train+your+dragon+theme+piano PDF link annotation
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b035f914c8---72006499064.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/kavemagutope.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/16ef23bf8587f80f32a63e729626f9b2/zodakukudar.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160863eda00590---fedegobotigaz.pdfIn PDF document text
    • https://panificiopasticceriabattaglia.it/file/96365551890.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/sagogomerirakigebe.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/hd050aa566a6lhrfj14o4amspu/47546753460.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/panojutizubalupojited.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c094841787e---wenozapalewewaravisaz.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/0qjaf8c0uf5orto7fttsffu2b2/66790799828.pdfIn PDF document text
    • https://oumkua.com/userfiles/file/33808094985.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f19c8d07aa---seropixazawi.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/b6e797ac9fcb5c0e97b5519e53be1437/kitoxij.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/66629260688.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/776c8596245f50e05d267cdbbde13ee3/53459206207.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/099b2ce747f3becccee97cfe49c80da4/wuxaz.pdfIn PDF document text
    • http://smeclassof1987reunion.com/clients/37165/File/lisefuji.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/92724342208.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210619_CDD85C8E6221FF59.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/julolumaku.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6101cc737---15584156572.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ab37ac2ba---39815278729.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/5bb21d2ce9fd3af554ceba891481009a/kerabexitirenosoroladiguv.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/mobuk.pdfIn PDF document text
    • http://fkhd.cz/data/img/xetesebelibebukif.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/gbq53q5qjgmup7gf6ct3umer71/71005015337.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e04c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f85e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85E 18064 bytes
SHA-256: a3d338fdb3afabc60ba7871a556c8329821e2c6c7a1e7607e8df199058df37e6
font_02_sfnt_off000127da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DA 10916 bytes
SHA-256: 48f33ec9ac3cff76ab257fd5a99b204763b6cf44e46bdef8cce859d3f8aef8ab
font_03_sfnt_off000140b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140B9 18776 bytes
SHA-256: 3ded9aaca2ef9e6c6e95cee9882111b9cda0db582afcb602817e0619031ab472

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