Malicious PDF — malware analysis report

Static analysis result for SHA-256 c098d9f0a9b22ad0…

MALICIOUS

PDF

88.8 KB Created: 2021-07-31 07:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4633d79b2b108e02dbbba3ec88c3d43b SHA-1: 4dc2d85100f479f559b28adc675dae6c7b2ac2ed SHA-256: c098d9f0a9b22ad0ec5123ac0d4a45cdbdc5548dc01feed0d4d6dae51154fc85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, so the primary attack vector appears to be the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://synerhu.ru/uplcv?utm_term=ace+ventura+2+full+movie+in+hindi+dubbed+download
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/5ea4575527932f616df161c8538820f4/xilamapatu.pdf
    • http://ramsteinroyals.com/clients/e/e6/e68fa2bc61b75b8a06766e25905052c7/File/72830287801.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/4dlkhanhq43g2nq8dt6b1stl87/23133719375.pdf
    • http://studioboscono.it/userfiles/files/posuxegalexenutifi.pdf
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/joziloxidisugolu.pdf
    • http://refah4ter.info/basefile/hotelrefah4terir/files/xumilinudiguzarekabev.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609034f894266---nujijudugolukajivo.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/389ea5427819c16bf47a9b9b332d71d1/12446918610.pdf
    • https://asthasupermarket.com/userfiles/file/61501805134.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/9f2d312080b07c0f0f102416859d7667/rawowubaxu.pdf
    • https://bookatowncar.com/userfiles/file/bufawu.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/j1d8qogqtmv9casgdho6aem717/mogone.pdf
    • https://discovercefalu.com/_data/images/file/ripikekunowegipaw.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/d9b9df3fac3c820516caddcd59c7fe9f/65319901072.pdf
    • http://fautographie.org/images/userfiles/files/beseg.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b7fb6323d---42369743098.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16072f32761f90---14276579011.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8fb797a53---40125846432.pdf
    • https://mmszke.hu/files/file/pulinoledozijanuta.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/d8d11e87fae204bfe88d14f1f13d2fda/jowosuwufelujoj.pdf
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/3e2c9ee6d13fc8adfe0b410ca6012c88/tunotejopilegivogonu.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/8qon6mqn4everasuht298r07v5/29414322316.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/55qjuge6ggmr0u0uor60rfpvn2/77511225662.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d98e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD98E 16792 bytes
font_01_sfnt_off0000f1a5.bin
0b58a2fe57eceb8e51b73e7af57691b70860f0e2f90d5a527a8f6a72526c8e54		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A5 11064 bytes
font_02_sfnt_off00010b53.bin
0c61ed9d4373885489fa589846a121ddbef3e39eb4ea57b90decccf5064db7b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B53 18900 bytes
font_03_sfnt_off00013d03.bin
e6033277815c4695c73e00eb917cca9c0faba91f93c8373a624cdf486921d968		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D03 16564 bytes

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