Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b1ae3b1bb1911a4…

MALICIOUS

PDF

84.8 KB Created: 2021-07-02 01:57:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dbe23e83c35045b4ed703c983422220f SHA-1: 9893a5ef7fb4f9a39a6506e628a1d71209db3256 SHA-256: 3b1ae3b1bb1911a4c349c965fdb6b5c7b3d45339953ff464c6712eff71e6e485
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c07ec10b206---gabunosorebezasuleripobo.pdf
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/9c02757820ca514fe953dfbc75a096e8/82540884754.pdf
    • http://bclgrouptt.com/userfiles/file/nepuwenudomevisawajog.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/73477f62fbc4a7699790a3455e2881a2/39917674408.pdf
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/1dba1a9463d78694a2948405f16ea268/70697099893.pdf
    • http://jtour.vn/userfiles/file/38611817304.pdf
    • http://www.odnpoznan.pl/fotki/file/file/muxuzuwoliwokelokob.pdf
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/0b7aa4174db26ef29f5cee2845e44caa/bezemulotogemi.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/54omur5g49seerjm1rsf7a214g/manuxoxal.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608fecce84a09---fuzunimixiwowufebozujo.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b1f083ed7---14996325885.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907612d3502---90399356950.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/8c429a75f7347723446bab436e06ae59/zovubinulimobev.pdf
    • http://lavalnerina.it/userfiles/file/zebubejomedoziramukoriso.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/b6b517d0e2f77f7143c703450416c627/xirojida.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/ifjtv8eg3o86e9v0g6t0q4eupo/89763269384.pdf
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/rizizanamiw.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/0b7e0774fbc0c8877686566e55441e64/xewem.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/106856aa36dc609fe22d9bf0b6f00884/solokudirusenan.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/c64cc0285ff99f8faa0bd0cf3f55a367/magetumuxugubovipaliti.pdf
    • http://pnmanagementsolutions.in/uploads/29708405219.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba32ac1f30e---36704959623.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=toothpaste+for+skin
    • 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_off0000eac3.bin
92f3d8b20c7660c51a745864f6714103771fd9d749decfac5adb300d916cef8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC3 16784 bytes
font_01_sfnt_off00011670.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11670 16792 bytes
font_02_sfnt_off00012e87.bin
631d413dccea86d820162e1d21ebab6507d95b58ee93daffae7f03a5ac076bb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E87 10464 bytes

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