Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d4b0657ccdf132e…

MALICIOUS

PDF

81.5 KB Created: 2021-06-25 15:37:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e3dc419d2201d744384118022b505152 SHA-1: a3b7b3b6b26b0714ab8191018b9688e9d734a0d4 SHA-256: 0d4b0657ccdf132e70abc084001e83ad14637f2fe3cff8ccf9de81314bcd15d6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload storage, indicating a link farm designed to host malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading further malware. The presence of multiple unknown URLs hosted on potentially disposable domains reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c941be2a59d---79959903607.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/rsvpkro4fkblgdh0lskfibrjh4/jisobiforerugukikitikiver.pdf
    • http://faradbox.pl/files/file/sonalerok.pdf
    • https://marljivo.hr/userfiles/file/buzavowoge.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/n7n4445o7fa9l441klf9hf5po1/bilekorusi.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0966043156---lufubud.pdf
    • http://allamericannursing.com/userfiles/file/mokisulivafamo.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/40e7f4f8b10814ced00b9fef1b8648ff/32638801659.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/aeb3fdf311394d0af183837ae7d6b5af/53826266060.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/4b027e642ca1f66f9f48ca32581d9de9/80755601361.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/592mubjpj01qlpi3gjodv4pho4/lozisolubixatiril.pdf
    • https://daaeportrett.no/upload/file/34363611366.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160967df5c7a00---16774371681.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f2746f428---62985989778.pdf
    • http://medob.org/SITE/files/editor/file/xuzudepojikuritalu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=limitation+act+1980+adverse+possession
    • 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_off0000d881.bin
d7c627e6f4930a725f4e6ed6a6a4230835564b1bc9edae2c96fca60ec935e9ea
pdf-font-stream PDF embedded font (sfnt) at offset 0xD881 11204 bytes
font_01_sfnt_off0000f2c9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C9 16792 bytes
font_02_sfnt_off00010adb.bin
c9991e5fc9e3c0b2bf6d8036c6e680addb67e09d01f9fe8aa19d59be3e207acc
pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADB 16988 bytes