Malicious PDF — malware analysis report

Static analysis result for SHA-256 8776b7040a0e5689…

MALICIOUS

PDF

74.4 KB Created: 2021-09-05 05:28:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 332a30367432b916bab30d3d035fb3b3 SHA-1: aa01f5797d4a681109d2e9a94c14e2723d370c35 SHA-256: 8776b7040a0e5689a6303e6b8654150f90719fc88efcf4901fa65cade1e60ad9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lead users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://crysiq.ru/uplcv?utm_term=areas+de+cuerpos+geometricos+ejercicios+pdf PDF link annotation
    • http://pathtojanna.com/userfiles/files/sijanuvumapuvidame.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/fidurutuxobaforokavon.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/u3c6v4ioihnp1otjtjq8qe2eht/21115871839.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f0c376e18---73164924937.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609feffed04cc---wikosu.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/48221228317.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/suredivesobanejubajobu.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16107e6ccb3163---xadug.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210516221004_1514298995.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/futubefogidojabipopive.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f1b0ba29d---mimixewezo.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/217359131.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a95938377---34049725144.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e61fa0b8b---xovexidejege.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/bemidutuzumigibuf.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/lcediurg2dn15rjiinnk8heeu6/13011445838.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/woditoz.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/63074266043.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9665adf01---ponijebuxa.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/54645841552.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/32855657673.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/mejufojirebusinibidesog.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a70109b8d7---59573165905.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/0coqbfjm2mbgjhr4669oih8ju2/fevoserokil.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/samupat.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_off0000bc2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD445 11024 bytes
SHA-256: d3f17964ebb7343147452fd97121d2cd6839d312980ed99e2e685dd6be4850ed
font_02_sfnt_off0000edb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB3 17928 bytes
SHA-256: b446dd323d3d15658506ac6895bbcadd89e6ed7897d26cce53099578d31ba87e

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