Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4593296e7c12857…

MALICIOUS

PDF

71.8 KB Created: 2021-09-27 03:33:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a4e484914324fa0c222e24df6dc6eaa0 SHA-1: 62e3c017422e6a3171a7dae87c55ea52a31d2bd8 SHA-256: d4593296e7c12857e1b99acdd493b3924c6e53b70df92bc73f6ec90b7f724aa3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or are part of a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the embedded URLs and the 'link farm' heuristic indicates a likely intent to lead users to phishing sites or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://shipsupply.ru/userfiles/files/xugijamasisiv.pdf In PDF document text
    • http://devitohomesorlando.com/userfiles/files/tirode.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/mefosanenibamikanug.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/gofeseferazas.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/kodovigogewigarog.pdfIn PDF document text
    • http://rayanchem.com/d/files/76316295525.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/navukopizutazaj.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/wezoxexanapegobunatas.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/44618649622.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-16/images/files/wokamibu.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/luraponiji.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe75196594---ravobajasesiwere.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1bcdd93d0---91340475847.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/xufoganamifa.pdfIn PDF document text
    • http://isotech.si/uporabnik/file/maruxezobevegole.pdfIn PDF document text
    • https://www.de5dollarsdigitizing.com/ckeditor-ckfinder-integration/uploads/files/subuvibizusikobilin.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/lumuselafesezetisimebuw.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/57938330396.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/65498019660.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/vepapa.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///89879124481.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/66039665923.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/mogozedewofuk.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161465ed562568---budesozepatafoxa.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/wigujegabudolob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=odia+keyboard+for+androidPDF 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_off0000b3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A1 10408 bytes
SHA-256: de15726c516d7d3a8196f5b44cb5f7a111b5126c951eaac112f496215ac601c4
font_01_sfnt_off0000cb48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35A 18192 bytes
SHA-256: 589d633ca88d2105796e8801a168a2b8fd0d4fc5c43a44bc45fcc5635f9e2332

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