Malicious PDF — malware analysis report

Static analysis result for SHA-256 9abc5f619c297bd9…

MALICIOUS

PDF

82.5 KB Created: 2021-09-20 08:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4068ea8a5a778db18308b3b1a0b880c1 SHA-1: b18182475e38b87a986106f397c96622d641051c SHA-256: 9abc5f619c297bd9fd8f6b6da731e3925a54cfc0deb71c1a4d488175ece2421a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded URLs and the 'link farm' heuristics point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://nomylo.ru/uplcv?utm_term=pokemon+black+and+white+nuzlocke+download PDF link annotation
    • http://www.sictombbi.fr/ckfinder/userfiles/files/17896157044.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/39215546864.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613908de6b2e8---40699701451.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/166597668.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e6d6d6935---mavufumuluxenedutire.pdfIn PDF document text
    • http://leton.pl/userfiles/file/xejojup.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/xawuxizavaze.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/gajosexoxafowonuxu.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161369fc6eb5b5---80293484038.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/92857391635.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecc7352931---vazuxololoto.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/87992468665.pdfIn PDF document text
    • https://heureka-cz.eu/files/7760835389.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/miriziwetisigu.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6e84799b0---15105563186.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/41125692232.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/6eb6df6c886a28000402ad6e38de846c/perewufuvikojis.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/kokumafisate.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/nogibowiw.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/62082832450.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/puwafas.pdfIn PDF document text
    • https://kultmotor.hu/images/files/18614273186.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/8e11cb76977fd242239035037254cbd5/bekifen.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/sezudep.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/futixofugupakizeguke.pdfIn PDF document text
    • http://hbaoge.com/upload/files/22695438078.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_off0000db18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB18 18256 bytes
SHA-256: 363240bfbd71bebce3235c83223515aaa2d1c92fe5daa5800274a04d82f4da71
font_01_sfnt_off00010a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A94 10844 bytes
SHA-256: ff135dd921e4df16148ce8a890f77bc2cefff2a2ecbad5aadbd6b665497f1139
font_02_sfnt_off0001237f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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