Malicious PDF — malware analysis report

Static analysis result for SHA-256 74af2a1e64d4b5ff…

MALICIOUS

PDF

79.2 KB Created: 2021-08-20 03:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 93a833d635eee4921d60f375694312d1 SHA-1: 3d18e2eb85a839494277f707f86da1fa9c0bae60 SHA-256: 74af2a1e64d4b5ff4ac9abd54925083d32030cc36e781c6e6f4770e19e55261b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. The presence of link farms and compromised upload directories suggests a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://harchovyk.com/userfiles/file/vigofuzosudelaned.pdf
    • http://gourmethousemacau.com/UploadFilesfile///41556129993.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5c24d1676---54543720623.pdf
    • https://viscom.bg/uploads/wysiwyg/files/fajonukusidinejuwev.pdf
    • https://machnhaduong.com/images/uploads/files/48279144551.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab675a1a805---64292006517.pdf
    • http://aven.su/userfiles/file/mometogakozumatep.pdf
    • http://laduses.nl/image/file/86862788487.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160820d3487832---30782001686.pdf
    • http://ellev.fr/upload/files/sineg.pdf
    • http://tiga.co.th/ckfinder/userfiles/files/21900986825.pdf
    • http://bscsaoner.in/ckfinder/userfiles/files/26721769999.pdf
    • https://laptopserwis.com/app/webroot/media/files/22587571878.pdf
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/teposigesenenabubosebisa.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a281ae87d---kenolibaba.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf280bcf70---25008614177.pdf
    • http://mlead.net/images/e/file/29796357245.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/8vl2cou5ih9ic21i13pm1ptpc7/15404803639.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7981861bc6---nebixekikarob.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/c60f2df3e9dfc35ac44b1735b2432f2a/61521835715.pdf
    • http://hud101.vn/webroot/img/posts/files/bizaba.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=glitch+gta+5
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d701.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD701 16792 bytes
font_01_sfnt_off0000ef18.bin
0031f24025af5bed7c445b0397d52212c8771fc27fc8d5bed772c56c6bb982fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF18 10056 bytes
font_02_sfnt_off000105a1.bin
f3a7d2e29b4772f495afdcea0694afd94e6f5f0583bd06b20d3fe13e289d486d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105A1 16268 bytes

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