Malicious PDF — malware analysis report

Static analysis result for SHA-256 964c72c3a51beb84…

MALICIOUS

PDF

85.0 KB Created: 2021-07-17 03:14:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7dff0097ef4ecbd580cdbda91fe81919 SHA-1: d9d6ef5d16aa7ebd8fb68c861d7d1d96287a9741 SHA-256: 964c72c3a51beb849f338aa05a5d5f463adbfbbc67f0cd3ed240cd9f8a09b85e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm pointing to compromised CMS uploads. The PDF contains embedded URLs that lead to various domains, many of which are associated with WordPress plugins used for file uploads, suggesting a distribution or phishing vector. The presence of invoice or payment lure language further supports a phishing or scam-related attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608faaa0605cf---sixarube.pdf
    • http://healingtown.org/userData/board/file/naselefutanetadife.pdf
    • http://hy-concrete.ru/d/files/85150237744.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/fd5ecf15d666ce721d570168aaa490eb/lolava.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/8e5566c32b2111a79930483d26ca3848/13485798.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/07685468dc81636a4fb81b8e12f4057d/gogipu.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/r11pdj9ep6t9dq71agipvcq9ee/21234015174.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1066dc06ff---69971760546.pdf
    • https://menu2uplus.com/images/file/buvavijokubemogujabi.pdf
    • https://daiichitravel.com/uploads/news_file/10961666495.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769236381f7---ratemawebizud.pdf
    • http://jmdfhjl.com/fckeditor/userimages/file/64139109721.pdf
    • http://bigband-ulm.de/userfiles/files/97771498685.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b216b7cd50d---31344971315.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/835f4c906cb97add7466f8743fdadacf/56553416216.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/d5v8vnppjgh47me0k3rsokmvp2/50919624557.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/f5b27379a908c546270bcdd471f6e26f/4042791902.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c60eba66d5---tagajobolodukefa.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16076628b4dec2---sigetitonufuvebaxanit.pdf
    • http://bjhtdszdh.com/v15/Upload/file/20215201547597296.pdf
    • https://xn--mgbaf4adbs1bd2i.net/upload/ckfinder/files/92494342996.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087d45e023e1---pazolexamapajikidowufi.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/4b073b11f66576de434406053fc22dad/liziver.pdf
    • http://autofulltravel.com/userfiles/files/71788959653.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=tow+the+line
    • 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_off0000ecef.bin
471a7ebd1571e51796cd310654332c20f34e481def0cf8cb027b78a41dd888c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xECEF 17388 bytes
font_01_sfnt_off0001198f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1198F 16792 bytes
font_02_sfnt_off000131a5.bin
e9d85a5eff63897d76138743b7553368cf3a2961597536c265395900beb3742b
pdf-font-stream PDF embedded font (sfnt) at offset 0x131A5 9824 bytes