Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d60d0384b8bfaea…

MALICIOUS

PDF

85.7 KB Created: 2021-07-26 19:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f0604b310ed249852735455971e954e2 SHA-1: da653f5845c593a6ed11184704ff6386fcf113de SHA-256: 1d60d0384b8bfaea5ba5e82b504398d3cbafcb1ea70e10992bd9d2411e52f67d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories, likely serving as a distribution point for further malicious content. The presence of these compromised CMS upload links and the overall structure strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/1ke96bskg6em4a50jrnqoo6nn6/punatuguwe.pdf In PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a7c51ad895204fd6d4d0a52fd0a4071a/rinop.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/xusarerosa.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16078146763c72---pebapivasebeson.pdfIn PDF document text
    • http://thaide.org/userfiles/file/ragosi.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/28423187179.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/37470347517.pdfIn PDF document text
    • http://wawa757.com/uploads/files/kunekiwaxozufidogaxub.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/29306114631.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607660d714e3c---dipusugapubabigulug.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/47367936003.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/depa081sij5ni06i3mubdaeur7/birupegojulopera.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/icqpg349irse1kdk30o4g8u930/76417250290.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607940ca713e6---19838740910.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/jepubeto.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/badep.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/zujimigelaxugolenizumux.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/navewoxerurapofabaduji.pdfIn PDF document text
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/nitopuxapovanaz.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/31348202062.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e3038310e3a---xasuvizekilawexen.pdfIn PDF document text
    • http://slsnn.ru/content/files/kapizuji.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/1806144787.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+long+does+covid+mental+fog+lastPDF 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_off0000eb8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A6 10864 bytes
SHA-256: a71eee49e0df7db19a7ee29e3ceec45abf858cdf5c95412bf7a4f601eb2b695c
font_02_sfnt_off00011c90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C90 16884 bytes
SHA-256: 89d4b1d5824d3b2f4f079e800cf6521a7630963e7cad92bd2ceae382cb2247db

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