Malicious PDF — malware analysis report

Static analysis result for SHA-256 107051758adf30e6…

MALICIOUS

PDF

67.3 KB Created: 2021-06-18 11:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d305ba69b418c86d88464c341557d62e SHA-1: e8529bedd79d5785ca8e3c4cdc7d6701789146b6 SHA-256: 107051758adf30e619574e4549b45a68dd4f9449c2e160d0c4011059cfd3ac75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm pointing to compromised WordPress upload storage, suggesting it's designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b3744ebc93e---51412715640.pdf
    • http://akicgiyim.com/userfiles/file/66757596509.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ab750524487---79848811063.pdf
    • http://haiphongcontest.com/images/files/voketazejedixuxam.pdf
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/3ea8a1003c3fd1f04ae1b1edf73ed3f7/datirawozom.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4175eb3ea8---pigafavalelelona.pdf
    • http://dancedynamicsla.com/clients/38740/File/4726157509.pdf
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/68902537289.pdf
    • https://kildevangen.dk/files/xokagelezezukoxa.pdf
    • http://goldway.jp/upload/board/file/34824614340.pdf
    • http://eventcompany.org/clients/e/e3/e30ef11cf4efe639fe6592aa37b9cb94/File/83087432051.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/6abdca93dfc67c8ec53d3a006100f700/49681549753.pdf
    • https://cplastik.com/data/cms/file/fenirodufem.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0b364cc2a---xetoluregovi.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/hnpq47jtl49j7nvfc93p8plmh1/70472153371.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+do+you+edit+a+saved+pdf+file
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb48.bin
3f112329a290638becabe6e8fc5d700b1b724d64b54e913ef7ac6c7f3e5cf5d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB48 5152 bytes
font_01_sfnt_off0000dd04.bin
ef037b9688f04335bcb6542d733a008907a1b70b66688ce5011d20ed46560378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD04 10352 bytes

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