Malicious PDF — malware analysis report

Static analysis result for SHA-256 5118dc29e661fb37…

MALICIOUS

PDF

89.2 KB Created: 2021-08-18 21:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2c5a1238bccb1a7cc2972a5f1ee7f9a0 SHA-1: 96541faffcec339b8276b20d7ea84312f002d178 SHA-256: 5118dc29e661fb378a99322340660918c16f710e7b22372289d6d0296bcb9f3e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF contains a large number of external URIs, many of which point to compromised CMS upload directories. This suggests the document is designed to act as a link farm, potentially leading users to phishing sites or malware downloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c085780c039---gidowobefosegovakisi.pdf In PDF document text
    • http://go-forum.cn/upload/files/veretimoripaf.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/c63f7f815ebc4bf23c5ecee61dbd200e/42793436893.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/rexorugalasikobagidiliki.pdfIn PDF document text
    • http://unsersohn.ch/images/file/zowizidutodemefagukaledo.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/972da7300973841256db0e5a3dce97ff/taxasomixixisiketixo.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/dujisulugagagota.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160913cb0d6548---muvewowufodub.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/16473653958.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/u0vpb7o0r62020mu90eji2c376/zupumom.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/5f35f48e4e97d3ff9dbca5d5c86cebc0/80398720087.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abfb86aa34f---devunaxubugasikufiluj.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/fonukizo.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/b1fe4388113289a0a1952ab8bc9852bb/42301728915.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/lilogimipe.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/45182660840.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16094582a9bb0f---18492743948.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e94b99e9c9b---54263957494.pdfIn PDF document text
    • https://baongochoa.com/upload/file/wolapisebenaregiwatisuj.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090c414433ed---82295411309.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/kafezinaguneduw.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cecad946702---12980701032.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sipevibefalevabuxomo.pdfIn PDF document text
    • https://laser123.com/geektic/files/3542936833.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/razatiligokam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=planet+earth+jungles+worksheet+answer+key+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF285 11208 bytes
SHA-256: d46e300fe59323024df50520da105c5fc58b2e323e32b6e5c8ce9cd7191f3631
font_01_sfnt_off00010cab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BD 20064 bytes
SHA-256: 784b480b63fd9e73fff0314f79d9c4b7313338b0acb823ca29b4cb66838afa9a