Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c1422cc2b6a949b…

MALICIOUS

PDF

82.8 KB Created: 2021-08-31 22:20:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3966aa60607ab6040d2dc41e9c4775ba SHA-1: 3ae7c2ad50ba90c50b5115a402258514610896c0 SHA-256: 8c1422cc2b6a949b0852e03c8f78a84b213b71a174d3920b740437776637818c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs are consistent with phishing lures or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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=class+12+chemistry+all+formulas PDF link annotation
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607c520db0856---79612035801.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cf92558fd0b---xomemowotezigaxeg.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/fakabuvawajaz.pdfIn PDF document text
    • http://filatelianumismaticaumbra.it/userfiles/file/lezulelup.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/10218289133.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/34419000719.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/darim.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/c15bf85949417902a84eb7f4c3eb4657/wawilakuridoduxazilefofut.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/pixalegaxudi.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/1d7b4d9a3f61dc9597ea7492807eb1de/64883893692.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/27p9g75icmv59s4ad8rbepdjuf/mosebosip.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a996ab6f521---xopaxebotuzukimijusade.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/9aa874c24da3ee8b6da06b221e76187d/10209375529.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/3041313086.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/9ae19dcda9918e09a195775e5c58d63b/vudizof.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/e72397283f6869510606e348cc5c40be/10761629032.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a74a3444268---89172066413.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/5vpjrdnc59neh4qkncob6qhqh0/forerugapomipukewimotobin.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081699f45068---68165863184.pdfIn PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/lojovixane.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c13e77a2f72---80948080629.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_off0000dc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3C 17912 bytes
SHA-256: 6eac099de23c342eed07a3f0e81f990a7826d561cc2af340d4e274fe69fbb5e3
font_01_sfnt_off00010aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12302 10912 bytes
SHA-256: 95a77fa6bdcecc9c1675765ff7a013770ac730ae20a3fa3ec06337f90f7acb45

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