Malicious PDF — malware analysis report

Static analysis result for SHA-256 c745f8ec3ef80b8c…

MALICIOUS

PDF

83.8 KB Created: 2021-09-07 12:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2f3d646592a4bab78784be1a85b9c245 SHA-1: 25080c7e39d25754937604d00e0935dbc6215acd SHA-256: c745f8ec3ef80b8cdc4ac2fb21c0fcdbe51ba6ab40edc4faf55bf0c41e82cc16
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://finatwork.com/userfiles/file/bexaneberorule.pdf In PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/78368700424.pdfIn PDF document text
    • https://media-get.com/userfiles/files/xonivotedunizakidavugaku.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/rasawisasodawerixaguramok.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/ab66192cfb47e52c4ba92f58615e4edc/debazeropuwirazezanipil.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160abcd7e5ffbd---67761558328.pdfIn PDF document text
    • https://bor-diing.com/upload/files/38926587663.pdfIn PDF document text
    • https://scapetime.net/images/website/user/files/wegorudamur.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b135254b867---84528179237.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/30524787810.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/bezesumikewokafefad.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/sadolomiterevoja.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/bf9a74800c7048d2f15f257297c77230/90612209508.pdfIn PDF document text
    • http://robbinsfamilyhealthcare.com/clients/2/2c/2c787fa606fc56c3a3a24dfc5409695f/File/subagawufu.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d10bd41b3---nipodofuzex.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b78c976588a---49874284966.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/puzawirifepegolebemux.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/f3fbc27a08c2dde5fd18202884cdc293/78190254914.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/nurojolidetebazukejadike.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/kifojuzuteriwu.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/rudapamoxin.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606f019f1a0ef---xewalenamunew.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/ced57a4a3042238298ad322357be892f/detutepidekizulajeridoga.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/76455238069.pdfIn PDF document text
    • https://krusomying.com/data/file/97696690485.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/lufajoxudutul.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5788d1a2c719d34866b3a90b5532c728/fadigugigivawikuvizixok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=adobe+pdf+thumbnail+fix+windows+10PDF 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_off0000e16a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16A 11248 bytes
SHA-256: 6e8b023d566b0521cfade2f753d6e6086367ff2e509f27d4537d49778b9c8bba
font_01_sfnt_off0000fb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001138f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138F 17732 bytes
SHA-256: ad5321b4be82766e293f4d59060290489a392da30c4d633798e98b980e977bbf

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