Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb5d13177904cba3…

MALICIOUS

PDF

72.7 KB Created: 2021-09-09 10:07:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b0da1f21b359b8b616c10334e4094271 SHA-1: b6a84728f62a721125c98b5bd9fdfff8caa8a8cf SHA-256: cb5d13177904cba306ac6e6f742ddb54940f0848da62a0ef7638ba83ae121eec
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 disposable domains or compromised CMS upload directories, indicating a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and heuristic firings point towards a common tactic of redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://ambcavallon.eu/userfiles/files/56813205275.pdf In PDF document text
    • http://jingmingtai.com/filespath/files/20210905064345.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/66775496430.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/nazaxixaririz.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/d54ae3ef7e97567368d238a5e86d2edb/49540638276.pdfIn PDF document text
    • https://robodom.si/files_vsebine/77021070795.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/87653986340.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/padivaj.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345a0f6867f---11543114152.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/n2hrbrtele2rt6pc3c3pcv3a2q/jidalixasesigepi.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/91570906381.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/44769557290.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/gabobapo.pdfIn PDF document text
    • http://citranco.com/users/files/kuburixofi.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/91925569476.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/71013013091.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/zomipitogijimetejakogel.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/vt29404hubafapfd1pihl326fu/busupowaduvibugovosife.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/popozebuketaporugef.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371a176669c---65917644399.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/lefufuxivexodelepare.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16138df1c39241---58676566171.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=minecraft+cracked+version+for+androidPDF link annotation
    • 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_off0000bc12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC12 16092 bytes
SHA-256: 259203a2ea0bb857dd0ae32444a8018b9e103519af19f54584d64422eac5449c
font_01_sfnt_off0000e524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE524 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3B 10576 bytes
SHA-256: b8a46dd99a540f47c079b5cf2b42ccd8213b6e88a6261cb30ef56128fbc694b2

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