Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c3f3ea4630f9b37…

MALICIOUS

PDF

73.1 KB Created: 2021-09-05 08:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: debbf53435d4989defc2f3d3cede6a9c SHA-1: 7190d2c378ae289e9b7ee2bc80f8c7cdfff24382 SHA-256: 4c3f3ea4630f9b37e38cebb63ee18524414743aa4833b42fb318b5a0e4ae0396
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/8aa5aa946d5d3a6089f70f13fc67d077/gawoxabibimopexelexarip.pdf
    • http://polyalpan.hu/_user/file/19096157092.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/j2qn0il9pqvqt46jumh5dgfah3/19722385386.pdf
    • https://avistravel.ro/userfiles/file/113495962.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4bb770c83---kebeluzurazibe.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/3aa0548096acf5556856bd061ed39708/51528193786.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608edf061e3fd---gefipi.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160824c3c25e6b---36027007831.pdf
    • http://phantasos.org/userfiles/file/sogetepudasi.pdf
    • http://le383.com/uploads/files/nusupekotusiperaloguw.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/v9g7f3clk37qt1ib3tp73q7kg4/31122942577.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/89c1a285bc84cee1f17fe98299d6088f/lizitojozejumogoxozedop.pdf
    • http://studiotecnicopetrillo.eu/userfiles/files/69281797726.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/oe3uo076jaqu4o0je81sis53re/74129723722.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf582bf276---vepuvidosiv.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fb20b8951---24521211033.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/b136d9ad304091e6125d4d060dbdb5e7/65752742389.pdf
    • http://www.bufolari.com/public/immagini/file/bawavumeroxetile.pdf
    • https://psychotherapie-coeppicus.ch/userfiles/files/monafiles.pdf
    • https://aronabritcan.com/userfiles/file/merifevijakugakanazijo.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608219cb3d214---97976488132.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608acf0804944---javogusebazuwit.pdf
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/53953458132.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=haier+fridge+hrf220tw+manual
    • 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_off0000bb41.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB41 16792 bytes
font_01_sfnt_off0000d353.bin
4708755bcdbb209d561e268633dbc09e357d77df72cb657e27a075ba866e3a75
pdf-font-stream PDF embedded font (sfnt) at offset 0xD353 16400 bytes
font_02_sfnt_off0000fd94.bin
d2fa938b30d205a7993c9b6c1c10d8d226c2e2cde7ebf283b91bfdf5b0d7ac04
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD94 10932 bytes