Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3c6360a541135f6…

MALICIOUS

PDF

91.4 KB Created: 2021-09-02 11:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2c5a8fc11c9442b5e40fc9248536edcd SHA-1: 98b5ce9667e5298a755396207c90b1e15f64b641 SHA-256: e3c6360a541135f6bc4ab4f619677450aa7533bf163f4c86a5fcf24e2cd3905a
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, likely to host further malicious content or phishing pages. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to distribute links across disposable hosting for SEO manipulation, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://kanomax-nsk.ru/images/sopotar.pdf In PDF document text
    • http://soncongnghiepjotun.com/media/ftp/file/darufum.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/219b5a75937bb3aad6b5a79e133c8f20/36858258899.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5bae42441---xututelezeterisajerone.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160afb3a316f53---95477745400.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ca0c7f4e88b---duvubuvomiri.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/d12b8b9c410afe5afa83d9a29dbf690a/17060643108.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/nipavaretosokotexinini.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/14326054716.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/46d81b9c4ba36aae49abde22e871439d/47847218450.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/bedazerigeleberoma.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/mekuvo.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/24626463384.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/losirepexuvejukokixatiz.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/nirusixagolo.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/rarigorijunujifupofoximad.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4cc9a1077---rakowipori.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/sajupolivujotolagapasa.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/dc38525fa21d03f1fc43501f2616fca8/fidogadow.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706fc956db6---tilolibutulipesofoxi.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/xenujixodometurebesupeto.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a869630a8d3---90842723534.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aff46cce821---zuvobemerujuxogawegof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=2005+chevy+trailblazer+repair+manual+pdfPDF 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_off0000fcbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000114cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CF 18524 bytes
SHA-256: 1fb0a7a41cc5f4dc5262eaf76517f04faa039bb44302a5b86c2b077a939e43ed
font_02_sfnt_off000144f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144F1 11356 bytes
SHA-256: d69f4ce1c3963408f394dad9fe261e3022b48d98f1c9b4a1ea656b51f6aef73c

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