Malicious PDF — malware analysis report

Static analysis result for SHA-256 14b9f2113b35d607…

MALICIOUS

PDF

73.5 KB Created: 2021-09-02 15:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 664505a3d258a5e0017bdd30f6f5d54b SHA-1: 72cb5577f1fb6f68fc8ea3b222f45cbe618820fe SHA-256: 14b9f2113b35d607301b05efb8214d4173ce421026517aac91a0497577c3a317
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs indicate a pattern of creating link farms on disposable hosting, likely to host phishing pages or distribute further malware. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=ifrs+9+full+text+pdf PDF link annotation
    • https://avigailpekelman.com/sites/default/files/file/90252335177.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/vudepexafumizoresi.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/4a6ee9f8381160d6d59e00934dab6f46/84866003292.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/labazazased.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a16aa993d98---40567416720.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/wufowolonotebuluj.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/611570d9f5b70afd21955527ff8e7d29/6381454984.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/xixuxenigonerilud.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094c1fab6994---37699603537.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/9a93869c0a37d2d16c4ef295177f632f/60360059617.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbbd2d3c1c---71973956601.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210810_7EC56F3A7960A4D0.pdfIn PDF document text
    • http://meta-min.com/files/zizibasotogafakure.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/kateruxarojikinafigiti.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/95568057171.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/fekisolutapozitapidofem.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/ecef68a497a7b10714c1489fa2972d2e/takilosivodivu.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/lixafupajunawatufukige.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607be929c2a45---wiregevi.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/juwagimutetuwemof.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/hd5b30n0q0ho41p4r74gnb81s5/mimekajolebowomen.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/94907630726.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f4802af4e---rojejusorimemuwovixutuvo.pdfIn PDF document text
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/87748370942.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_off0000bda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDA9 17116 bytes
SHA-256: 1b6841bd9745f5415b8f1e3e6e720d362a94500b7163261659c5908c3dc9ca67
font_01_sfnt_off0000e976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE976 10336 bytes
SHA-256: d4e64175bfe0b0de5a66d525862d6f1314f6a038b99b497ceea06bdd38e85361
font_02_sfnt_off000100f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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