Malicious PDF — malware analysis report

Static analysis result for SHA-256 2abdf858b742dd8c…

MALICIOUS

PDF

80.7 KB Created: 2021-06-27 11:30:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4a58912887e07c1e7ab6a4fcaca93f89 SHA-1: 470a1c8118114bca6bbe1ce7f84573d39f0c8d4d SHA-256: 2abdf858b742dd8c34e1e6edb2a459708d72449169bf6c25bcf4cce1eb566ee8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress sites, a common technique for distributing phishing content or malware. The presence of embedded URLs and the nature of the heuristics suggest this PDF is designed to redirect users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdf2426e39---jaselu.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/um735tm7lq87vmtsdbgsurq98i/nuvibigemeribozu.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1feaab2a30---wizipur.pdf
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/2c3524d9dc41d89368b40270dc982b49/tekobeladutixufesodefozaw.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/0c73836913af7c43327c58091e585358/vukogolibal.pdf
    • http://mdbim.pl/ubezpiecz/obrazy/file/93077174877.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078120f0fd1e---28916962971.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/52uhjeoeivgo669odqn7c6ta13/54374841410.pdf
    • http://bortran.com/upload/image/file/20210607081755.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/trkbojenqll291sbb8povsvucd/talobi.pdf
    • http://aurora-c.jp/files/files/27769668810.pdf
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/d4d95549fa003b76e99458440ed58bc9/29975227711.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/6hrg0gqgc1s0ngg1oeuslr64b5/kisilo.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/fc9e592cab7cb79265ed70d2840e0147/26906559199.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+make+smooth+sandstone+blocks+in+minecraft
    • 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_off0000d958.bin
3a27bd057e0c3b613e92de509daa79a7bbc787f6b6ddff85c465dc82c9210ebc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD958 16620 bytes
font_01_sfnt_off0001045c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1045C 16792 bytes
font_02_sfnt_off00011c73.bin
1beede027a92ab75e266d48af8547873604385476b16b517865f9577455aff3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C73 11052 bytes

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