Malicious PDF — malware analysis report

Static analysis result for SHA-256 edec652fd8af59f4…

MALICIOUS

PDF

74.2 KB Created: 2021-05-06 19:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 69a892261eb072e7234b8996fc84137d SHA-1: d1a5fd10a7a3ad6b63eb39e71a8814633942b02b SHA-256: edec652fd8af59f4a03cb8494fb2284b1aa2b4ccf4f5dcd76b77a3e19dbbcfd2
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/g3jqhjjlervdqu2pua602qts7k/kadetanafimix.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/bf759614fe1e735acdd441d5833470e9/befenowakutib.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/51a74s60jhp5cef1s9higqoev4/73608420390.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/5135e751deb7973149d17e1603bdf0ef/bizesoravejerutodiboj.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/qvo429eedv0q1ad2f4ldp0v1mn/36551863813.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/04b9b3eeef81cdb1204d552fbc4281c6/46791837313.pdf
    • http://dzbnf.com/upload/file/%5C/sesoxu.pdf
    • http://simonide.org/userfiles/file/61084797375.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bec216493e---xedoxaze.pdf
    • http://cukiernia-waltar.pl/qcms/userfiles/file/sopibarobiwe.pdf
    • http://ahlhy.com/uploads/file/031451142760.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079864a4a660---85498222133.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb0f553fac---firetekezawerunulurafubo.pdf
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/dcb48bf06e04d4d3c1276a487ee6dcae/zuweloxa.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/b4ed45852071ba92900aaa21484b5d87/revesijipaxo.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160878cae95a33---15565089497.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/fg76gom21m87e595ss9c3rarb6/22422962034.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=transformar+kelvin+para+rankine
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5e6.bin
a07bbd7b24aa164eed2a4f5ac5117afe16349cdefe9de0dd4022c92377b0bcc3
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E6 4828 bytes
font_01_sfnt_off0000e62c.bin
b214ae1f0014830037a0eef55dc2aa58f5d0f032e89da75d7e537062d5c40649
pdf-font-stream PDF embedded font (sfnt) at offset 0xE62C 12316 bytes
font_02_sfnt_off00010c1d.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1D 4324 bytes