Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd508c1a4e43caac…

MALICIOUS

PDF

92.2 KB Created: 2021-09-05 12:25:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 43cc646d349e4fbc5ff572d5863762fc SHA-1: a191eeef858d99d4f5d972658d0a665721e94017 SHA-256: bd508c1a4e43caacd80700cd272d3217f55c2e95e670f5db6ecb476596af4d51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as a malicious PDF by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm. Several URLs extracted from the document point to potentially compromised websites or disposable hosting, suggesting an attempt to lure users to malicious content. The presence of numerous links, including those with UTM parameters, indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://vrakskodamnetice.cz/file/46330006529.pdf In PDF document text
    • http://toptoptraining.ru/img/upload/file/91793452961.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/86619078984.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/ca7947b825df87e077fbe09cd78bc751/59581797742.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610e42aa41e53---livem.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/befolevuloma.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/fusiranirezolosasanadis.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099cb8a598c6---15947997068.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/94053988205.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/63664655234.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/2008638788.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/fd6085d3ef637126904a784aa2c30e47/zuwivijezotikamajasinuba.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/pizusixawug.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/ed2182f14c9cecad7ce1d01bb02dd8c6/wonajifemiz.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/gunowovav.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/jigisaxevumamelisoxoju.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-8-23/20210823182251861775.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/57325233120.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a1438e582---bubigutem.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ec14d1da6d84cdd0a4239e23aeaed419/91756741498.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/bajutibopiwizelatew.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/87909777753.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/36556732309.pdfIn PDF document text
    • http://maisondequartierdespareuses.com/userfiles/file/kudovetobowogemupuzixu.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b806604a7b3---26212901699.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=dunkin+donuts+job+application+pdf+2017PDF link annotation
    • http://medlab.webd.pl/upload/file/kekipebuvejujafes.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_off00010024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10024 18760 bytes
SHA-256: 201754182953d38d55604897a90f35d44bf3456ae06d1ebcbd5ada3fbd5a7b26
font_01_sfnt_off000130fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130FC 11188 bytes
SHA-256: 600567efb2d3cfe24418d9e035851c6fb03d3a4a83de707c3bc713d70d4bd197
font_02_sfnt_off00014b33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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