Malicious PDF — malware analysis report

Static analysis result for SHA-256 b690343568afda4d…

MALICIOUS

PDF

84.1 KB Created: 2021-09-19 10:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e8a1c93ea1ffa8ad796fb84ddbb0608f SHA-1: 4c73c83bca4f56422fb8c005925798d8624514b7 SHA-256: b690343568afda4d07d0a686918e6ea6140dd9d61843bf7a2b27621f513680df
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 as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. The primary purpose appears to be directing users to external resources, likely for phishing or malware distribution, rather than containing exploitable content directly within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f1e334ff6---26043967800.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/1dcf0d741b6bfc1fb2b281ebe52c435a/9070744249.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/vlocqe207t38uc65v34g5js6m1/kusimegurudimafinot.pdf
    • http://highlevel.pl/userfiles/file/zeruwofazafutij.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146b0352f979---90629275554.pdf
    • http://shopabrang.com/images/files/65908438152.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/lolutiji.pdf
    • http://www.cavice.fi/tiedostot/files/77698971936.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe8ee72230---goxevezezoxabuxakirab.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134e1a565c4c---misejapenebuvujokagor.pdf
    • http://ih-consultant.com/ckfinder/userfiles/files/5434292045.pdf
    • http://www.benyowsky.com/resources/files/duguzel.pdf
    • http://symbioticlifetech.org/attfile/fckimg/file///20210917203548_523140460.pdf
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/naxabotapagamonuzeko.pdf
    • http://1hozain.ru/files/userfiles/files/50974982011.pdf
    • http://imhkayseri.com/resimler/files/mozibalopowejirerunu.pdf
    • http://sunwisechem.com/Uploadfiles/files/geronotaf.pdf
    • http://mcenterdk.ru/fck_editor_files/files/34334265060.pdf
    • http://krukaiart.com/userfiles/files/bijine.pdf
    • https://iqmuseum.mn/uploads/files/pedodutodimivukosi.pdf
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/1905601015.pdf
    • https://adesso-moosburg.de/images/file/57730901175.pdf
    • https://hirurgija.me/files/zuwudugofovoruta.pdf
    • http://geotersrl.it/file/34380875453.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=adobe+presenter+for+android
    • 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_off0000e391.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE391 16792 bytes
font_01_sfnt_off0000fba8.bin
cb406852569c43ea8f2aacc3950c66db551987dc5664150d33eb5cb8537e17cc
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA8 10564 bytes
font_02_sfnt_off000113aa.bin
5c10f91d7172472ba2079aa454a4de9fd57acfdc42c9b8fddd899d088eaf88c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x113AA 18332 bytes