Malicious PDF — malware analysis report

Static analysis result for SHA-256 91bc7a76c68a03bc…

MALICIOUS

PDF

83.8 KB Created: 2021-07-07 18:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1b08b8976537eac721f043c687340ef2 SHA-1: ccaf21ffcfd826e65e8d1c7f07749c71341d73af SHA-256: 91bc7a76c68a03bcff092cd093ba305f8bd08fbf6e3e15d81813a7d3f4a0ec7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. The embedded URLs suggest an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4ef6623e3---67211784472.pdf
    • http://bluefield1966.com/clients/26642/File/86684062354.pdf
    • http://the100voicesofgospel.de/fichiers/newsletter/file/74088102439.pdf
    • http://kotolantopeni.cz/file/taruveveb.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/6f8dc49d47cc8e8ee5b6bdf2b125b669/nisudamanasagetagudojure.pdf
    • https://vishalahospitality.com/ckfinder/userfiles/files/goguvaseputaxikediwowalik.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/caaea0822475c4937221cbf7a7154f17/70789725122.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/6286968082fa1124d58ce3bc85ce57dc/22792212451.pdf
    • http://alpha-th.com/userfiles/file/savox.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/5rfk3ubqltqeov5dj1sssmbe37/52168983092.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/f79fb108659db84764276e0b1ef59fc8/maworo.pdf
    • http://coxfamilyreunions.com/clients/5/56/566bc9ad745482f371977770c3e6b383/File/99860484156.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//34292014070.pdf
    • https://tortugafilms.ca/adminfiles/file/dugexer.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989a499412f---rusuxukibek.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ec368faea---87083728042.pdf
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/28065668431.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/ca2bee6c3cbad2ace78b262bd74aa203/mudaxuxi.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62d37b3d6d---82226223873.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/584589b4f9ac8f758e55f56815ca5c3b/18485590623.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092106707781---fixuwujefasezixugeker.pdf
    • http://crescentcarpets.com/userfiles/file/defisesugug.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=borrowed+features+of+indian+constitution+from+other+countries+pdf
    • https://bit.ly/33Lp6L5
    • 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_off0000e45e.bin
838e360b66991d430e5ff7e8ccce940a0e95b5c3fdb51712e0e01ee5d4dc03b2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE45E 16708 bytes
font_01_sfnt_off00010fb1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB1 16792 bytes
font_02_sfnt_off000127c8.bin
5074df46aaf09712b96ad50c79ec19548b93a892643fd7b87c8b7f3d12cc8549
pdf-font-stream PDF embedded font (sfnt) at offset 0x127C8 11076 bytes