Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb86426a2e21545a…

MALICIOUS

PDF

78.0 KB Created: 2021-06-02 01:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b45ed92393a6d381a66e1ae9516f863 SHA-1: 7a9f6a634b24a9f93125fe123ce8ed141333b430 SHA-256: cb86426a2e21545a30258672b38563637d581356f72f3f5350ab5d6ec24f0eb6
154 Risk Score

Malware Insights

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

The PDF file contains multiple links to compromised websites, suggesting it is part of a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains a deceptive lure related to zodiac signs, aiming to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8751

Heuristics 5

  • 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
  • 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://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/97f5f7fe15cbaf5a3627b6b5474159d4/67144052601.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/999aea9fed0b0ce944479ed80f2cce5f/gewavelafudabajisef.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/08040c098d65661de06d9d4b666ce289/mutemi.pdf
    • https://agrilaui.com/userfiles/file/27113876065.pdf
    • https://arerp.kr/data/file/%5C/bumilikagamagonuwufaz.pdf
    • http://architects-desk.com/uploadsfile/baxusedur.pdf
    • https://bamfieldrental.com/userfiles/file/37080280825.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8315c25dca---vorinoxudexupisutemu.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160712737af1e6---zowoxovizimimunefigidaxok.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/6b590bb82cfebdb689388adac1298abc/sakid.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/1e844a01d06f37f400a0b8102af33aaa/65637021412.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/lf7i6n4j8vta6enuin0kf1c35q/wetugu.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e26a1eefcd---71352242078.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080e92bd45ea---basajuvudixalidetozub.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/lhoi30v491np3p7r9ekb1tc31b/46766735642.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/203351429b7c08668b45278755dd8343/fuvevun.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/d511290e53b5a7cc5aa3f108c04de0b1/xunumasijapubowibuwev.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=que+signo+del+zodiaco+es+17+de+diciembre
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eadf.bin
ac66ddecb1889e99694234647e4a1e19b6174440e696c9ee44c6cb9711419273		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEADF 3312 bytes
font_01_sfnt_off0000f6c0.bin
f23e07f9f4eaeca3db2f1ee92290c47b90c1b74c107c55720240b0ec5bb2e82a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C0 5644 bytes
font_02_sfnt_off000109eb.bin
81022f92c2abcbb70c377015213eddf0d4a43ab355a6c243786c932a47bc70d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109EB 13160 bytes

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