Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d2b87cf745f6b86…

MALICIOUS

PDF

80.8 KB Created: 2021-09-02 22:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 913a07a8e9ed4298303d838ec3198b33 SHA-1: 48798af47cfed052fc95758ff1cf1b9dfada98e7 SHA-256: 5d2b87cf745f6b864070fd75d386765f4d74ea4a7d15c5293cf67f751110b634
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the conclusion that this PDF is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://huntic.ru/uplcv?utm_term=free+pdf+editing+app+for+ipad PDF link annotation
    • http://tvoirostov.ru/ckfinder/userfiles/files/19827111717.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/96038724825.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/fipubegisezajojajinofa.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/83ce429a6909a8dbab1c12689298a334/zusev.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/guzawedudegagorivudu.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/17492850745.pdfIn PDF document text
    • http://exosushi.com/uploads/files/xonowuzulipilut.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/rikamurisinelut.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/50433699006.pdfIn PDF document text
    • http://heizler.hu/files/file/45221540204.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/bevijufikibi.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/82377688667.pdfIn PDF document text
    • http://chromatographvials.com/d/files/rikatabunegajavogise.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/51725112490.pdfIn PDF document text
    • https://beaszemin.com/files/48575645832.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/lokaboxumigowetaja.pdfIn PDF document text
    • http://gibisch.info/files/files/35882821849.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f6c6c3a2315---6678386717.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/06cbfe30779c957867339ee9eeda8439/57309627203.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607c756439b5e---28511571406.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-6-19/20210619093706558842.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/92794158163.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/7211909076.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/064861c28d92d01763a9934fa1a8386d/30682924977.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_off0000d910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD910 17416 bytes
SHA-256: b45cc1ba4a4a86c15932ca7e1c59357e33fd71523748cf6520dd242e0cbab28d
font_01_sfnt_off00010645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10645 10436 bytes
SHA-256: 3cd4bd3f22d10fcea714b727e33ad5ce3c05953ec71d2c798e39a0d20c002359
font_02_sfnt_off00011dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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