Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa6c4651cc9cb3d2…

MALICIOUS

PDF

78.7 KB Created: 2021-09-02 12:30:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c0f1dded50184e180e118a15f1eed9d9 SHA-1: 0748e5060e2e08425fbdea1f7399d5b2290b3f17 SHA-256: aa6c4651cc9cb3d269f7ad856bbed720486d203d54e961609a4a383b03df6eb8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of external URIs and link farm heuristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=ncert+worksheet+for+class+10+science PDF link annotation
    • http://immopolignano.lu/images/voripomalowud.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/58964062832.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8636b14c4d---tusizubibabusefo.pdfIn PDF document text
    • http://hainfelderteich.at/69020138335.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/gevipesinadidekobi.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/mukojip.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/upok194eibhff1n3buhdeu0rr3/95171251556.pdfIn PDF document text
    • http://intergeored.com/upload/File/52227388307.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/65537662747.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/5gcacun13fqdh0n62dn0ik8a67/vikazunokufikot.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f8dd5935094---datujajupadura.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/6a0229b088ae805ec9bc4520b9de871c/zubezavabibazaniteg.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/bewis.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/bagebosibupatijo.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/77548722123.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/fexupivusorakiwoxijib.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/sobobupepazenovadefetabi.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/nipipukepunijajonada.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160906bf1beb7c---45964320411.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0793bec080---beruvewami.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/41905931178.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/nt519rng1igm03rk1mshteib53/repakaxidepomajal.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-07-09/images/files/17417300919.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082be144b84f---86371083034.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_off0000d1e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E3 16604 bytes
SHA-256: 8d6f6ac3391882a96ae5a49fc74ea049d7ea0175bb1bbf502d7869a8a2368d78
font_01_sfnt_off0000fc6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6D 10760 bytes
SHA-256: a9cb471d72c900cc28108544f35da9383578d78f964132f198d8c022f0d1a734
font_02_sfnt_off0001154a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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