Malicious PDF — malware analysis report

Static analysis result for SHA-256 20cbf6f743d25caa…

MALICIOUS

PDF

109.7 KB Created: 2021-09-16 06:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9f1ed5e30d5fef0100d0150598bf38ac SHA-1: 0021c59845f4cd7baeaeae08680c3afc3d5d261a SHA-256: 20cbf6f743d25caad29de0a5c29ea854ade963a75c74bf446b056ea9eca6813c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://pixomot.ru/uplcv?utm_term=dbz+android+20 PDF link annotation
    • http://www.hgbehringer.de/img/files/files/99886751275.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210911_051269673D293BC6.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/72024070400.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/wulanebomogebegolakewumad.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613436162b223---5894535530.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/kenesudagarerel.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/69841170523.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/zubilapuzopem.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/29293626842.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/31184584638.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/0dbd86cfe0b3e3b12f156d3f69bd8625/60020365601.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/55327005554.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/8435024170.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/se2mei6tb8k71f1sgjbl19udhg/38269468957.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/76262333097.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/walejinofokinosalaja.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/39777716969.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f212f55d6a---44903426755.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9d778147a---girajuxatofesuzibimimid.pdfIn PDF document text
    • http://korytnica.net/data/files/24463835259.pdfIn PDF document text
    • https://actorconseil.com/files/file/vuxugamujevolinarisopu.pdfIn PDF document text
    • http://hoachattn.com/image/files/wukepoxonigagazipowanonu.pdfIn PDF document text
    • http://caythuocnam.org/images/files/losirupezomusezojuripawiv.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/juvetomid.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/pudilulitogowusekojukojez.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_off00014553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14553 10240 bytes
SHA-256: f72d160c9ca463b38bf2be2e533e9cb7e1bf5179b759a8d13d3c5cbe20eeff6c
font_01_sfnt_off00015c69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001747b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1747B 19904 bytes
SHA-256: cdfa65b6399c47cb41c199096800c31e24a13a46dfac46c0cee62c4a8c34ea36

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