Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a75ff539b31f534…

MALICIOUS

PDF

81.6 KB Created: 2021-06-27 15:09:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e17828b1b9a311dc08848905d7e8414b SHA-1: 1452edd002a5e90ddcfd00222ae654e8fe6c3771 SHA-256: 6a75ff539b31f534966c54755e8f9fb90d0a0a391f08ee4ea967bab4ff79849e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, containing numerous URLs pointing to compromised websites that host other PDF files. These links likely serve to redirect users to malicious content, potentially for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/1e69cff3a95dce998e3ae46dc5fde10c/xikexedikuvubuxegozu.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/cf95e33f9c11a34528af28793c55223a/lalezib.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/2e49aee9eb801252fe94096d3b5fd984/16572755834.pdf
    • http://dzbnf.com/upload/file///46913953231.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/7cea3e4d33c5438d8b119e573c459124/fatozuxaki.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607353fa057c5---nerira.pdf
    • http://comlark.ru/userfiles/files/3844447749.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607019d708685---80681268891.pdf
    • https://sasalidayanisma.org/uploads/file/jijuzobaginiwaboteligawim.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/slubaud10f0d90uqcap577gllh/sojaxepoxazuvezebanozilew.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/2b1be7236ef59d50fdb97928675a5186/23928148273.pdf
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfe25e531e---94263518077.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/fb4e66a3c1dd5e132486448059db2ac9/tabuguxaku.pdf
    • http://bitite.lv/media/txt/122/file/zupel.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/81a35b2d86631e145ff1fe44b3748ba2/39421114464.pdf
    • http://sarlampa.ru/upload_picture/varuredujexu.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160998e2bad520---81139582282.pdf
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/toguvuviruwasigejiluwa.pdf
    • http://knuhpharm.kr/userfiles/file/20210620045448.pdf
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/5b8aec4e2ee2a8214639d0c5f77b025d/sosazilunovifonexu.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a087c1fbf8---kejinalikurim.pdf
    • https://nicosiacaffe.it/file/67445861144.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=another+word+for+strongly
    • 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_off0000dc9c.bin
5321501a5696f4b4264726cbba9e8f47c1f5520a87ce78acb0a48ec2d3dbc54a
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9C 17044 bytes
font_01_sfnt_off0001092e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1092E 16792 bytes
font_02_sfnt_off00012145.bin
d3cd89fbaafd6bba4bfc1ecde97e7203339825cfff5f9be9d724dcd6aa71ed26
pdf-font-stream PDF embedded font (sfnt) at offset 0x12145 10560 bytes