Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a78acf03756934…

MALICIOUS

PDF

65.2 KB Created: 2021-05-26 17:57:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1bd061ea56cf7587cf58638d373891bb SHA-1: ff6aea55eabddd937ffab77db729fef61374fac3 SHA-256: a7a78acf0375693435fbade57aabfb29282e935dc87f897f9979a84a8e256567
94 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content. The presence of numerous embedded URLs, many pointing to file uploads within common CMS plugins, suggests an attempt to host and distribute further malicious payloads. While no scripts were explicitly extracted, the PDF structure and embedded URIs strongly imply an attack pattern involving the delivery of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8201

Heuristics 3

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fe904e2c5be9d370ce8bd4a9dfd2f0bc/16253776844.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/b53840475d6d4ca85e576a89da4ea746/30464345647.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/a24cf0b35d7b05281d9635cbbbb5af12/60932535166.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9a1338d04---42417775650.pdf
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076be7b04aaa---komosog.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a6552e03c1c---47126252653.pdf
    • http://interel-rus.ru/test/sites/default/files/file/loxusagur.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16075aef248650---69063097284.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/127jfeb6em7obdsl4h3etfr9n0/nazimexegemuzezuvotoz.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077cf54b9452---nitulusiniletikewu.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16074d1c454ef3---4404121978.pdf
    • http://andlupa.com/userfiles/file/64951793631.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160969359a9b35---25596417843.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/3ff71250d8483ec6295a8136bf2c9dea/besuduvasunuwabedumuxedak.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=are+pitbulls+easy+to+house+train
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9b2.bin
6f8489d3ee94aa5d37b3895c4adaac33ba413d813adbd064ad1353cd02446082		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B2 5140 bytes

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