Malicious PDF — malware analysis report

Static analysis result for SHA-256 532c1cfbc251c2cc…

MALICIOUS

PDF

89.4 KB Created: 2021-07-14 09:41:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 85bb169fb5ec6446ef5c1d5230983557 SHA-1: 45dbde3ad3e99660a913f21217e1432b795550bf SHA-256: 532c1cfbc251c2ccb13679402817421355a2eff55f91e38b3192f86c5494ae43
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 and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its true purpose, which is likely to facilitate phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/e2a59a60edc9bb38dea70e68f1493b52/luzigimuwugexemosisi.pdf In PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a8e9cd16e---wowurunoxurokojulilufadig.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6934ddb00---44613706783.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16092898ec0ab5---49097973252.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/vabedi.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/11301703672.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/e776cf6d77c6a0606e3d92a494752ebe/vugapikug.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/xubavetixisoz.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/33432899520.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf59a0bdd8a---bibub.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/66634175896.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16079c041cdabf---94073095124.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d5e4d0061c6---81376366314.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/6742b9ca191230178a5ace4a494e3796/kexufixaxor.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/85138951031.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/sb7ahp3knamkjuo340udmlor5h/81048296668.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/57023176701.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=10+gk+question+with+answerPDF 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_off0000fb50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB50 17196 bytes
SHA-256: 9cf892fb2ac35e85c0f73796de8259151fd14d973bdf7b41af59674b7ba9fc25
font_01_sfnt_off0001282a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282A 10844 bytes
SHA-256: f128f747a17723478d753151954da09ef423a91d2cbb14767b631701cd5fbcc2
font_02_sfnt_off000140f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1