Malicious PDF — malware analysis report

Static analysis result for SHA-256 400637078886b387…

MALICIOUS

PDF

84.9 KB Created: 2021-07-05 17:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f84106959c58b837c75449c30cee6681 SHA-1: db13b7aad1bc9fd19b0e19dbdc6048cec7640a00 SHA-256: 400637078886b3872d15f141cd50d8c076d4ce315f974ef521ae4e881113a2e0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and an IP address, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URI findings suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3634c844a4---41921045526.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/61c54266a8dbcd7b3b07594fbd9797e5/67591402382.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/aephddc20ea0hs3fbf36okl6g2/xabuni.pdf
    • http://best-infosystems.com/userfiles/file/26881875035.pdf
    • https://securityguardsupply.com/php/uploads/file/65170939532.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16074bb2b02713---tazeleve.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/crijra1cstnbulhkeqde3rj6d0/30925435573.pdf
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/c228b6f7dd2f365b024793889ad917b3/zomubudiseboba.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2ff56712b---wonojuratubito.pdf
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/3t4kpljdgubq7ma658h98qjpuu/sarolamema.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/3dcf1502e47df717c24eda1a4081135d/66568462339.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/50cc51845651bbeaba228f391e710c75/18255576876.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608bf575505ed---salakokozelikewopelunit.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f317af0955---bukusavodaro.pdf
    • http://cafegreenwichvillage.com/uploads/files/ferakorudijunerulatapavan.pdf
    • http://157.230.241.115/image/upload/File/94445588875.pdf
    • http://texmet.pl/userimages/file/77775725781.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609483ed7dcb2---97122456232.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/e499bd8bea5b4ebc9e5b16c2459f66a2/23255562916.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/75613a9074df8ce3a625c20f859fbbbe/93098899619.pdf
    • https://alianzatours.com/imagenes/file/sexewanovov.pdf
    • http://studiocalcinoni.com/userfiles/files/mowuxijizati.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=hottest+girls+on+onlyfans
    • 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_off0000ea81.bin
a58358215b2fbaa0b111f33ecfd9ee57c9f15b7a5d0d2603fffc7b286aac3ba3
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA81 17160 bytes
font_01_sfnt_off000116b9.bin
99a2c86e6c3fad0cd3a7ae099b431e53b71bd1409e73d45806f72d48296f9bfa
pdf-font-stream PDF embedded font (sfnt) at offset 0x116B9 10492 bytes
font_02_sfnt_off00012eb6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB6 16792 bytes