Malicious PDF — malware analysis report

Static analysis result for SHA-256 79ca316749bc795b…

MALICIOUS

PDF

77.0 KB Created: 2021-08-05 10:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e808c6c9601cbdcfe63835ed6718d0ee SHA-1: bc3d5a45bb7c19d1e33bfcf9f4330cd5cd24dc28 SHA-256: 79ca316749bc795b075a9cac8a31bd436eff53e28bc82d086e8fb43d39f4145d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/0f6284b227bd3189ff645802a97b0313/71254040195.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/508a467536face8483d62f4a6c53e28b/vawas.pdf
    • http://thuocnam.xyz/images/files/kurejuwerejajokutimorix.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ded31f76d2f---22807036375.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/d76i5gov3ndojf24hcv6g0k561/memawizuwaxiw.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/6d17fc8a92357190d2c28c2d2c9de52b/13675120808.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/20481314feaf6ea53e755c7a71f42ac4/vonubimif.pdf
    • http://web68s.com/upload/files/71732970703.pdf
    • http://amsasecretariat.fr/userfiles/file/sonijaji.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749e8a38eb6---rozoreveduku.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16076dbaa120d4---33551102403.pdf
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/791137f40a78d38d0e72764139433513/tezudasetekekofonopi.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/kg1808vcu8dlamg9u15e28fsfe/xiniful.pdf
    • http://kingsfinancialconsulting.com/userfiles/file/butofiwevija.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607394cf216e4---jodojezidomisu.pdf
    • http://piqiso.ru/userfiles/file/zosoxosotonozivuw.pdf
    • http://locnuocvietmy.com/Images_upload/files/kufoxezeraxixuvos.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077be7b99b7e---93149921299.pdf
    • https://esperanzadeavila.com/fotos/file/lovizijozulomobamosofuki.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/4e639238c6f58cfee901351d37d32631/60135316046.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=craftsman+27cc+speed+start+weed+wacker+manual
    • 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_off0000c8a3.bin
fd95ac397e35480c354906a160b3481913871e0a43270437bd61bdaf0195839e
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A3 11048 bytes
font_01_sfnt_off0000e290.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE290 16792 bytes
font_02_sfnt_off0000faa2.bin
9b8230b3f0546969f423871b85f1c3dde7ade71e5f00720c0e37be3c9b320559
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA2 16492 bytes