Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5c71269c0844fea…

MALICIOUS

PDF

69.9 KB Created: 2021-06-23 14:06:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3fa8c5a5e076e7251d6e85c0339ed761 SHA-1: a7e53bb6134fbd47c314f4c602440321538e5e93 SHA-256: d5c71269c0844feac5011f88a418f374e117223df96d82894ac0180e2b9a936b
156 Risk Score

Malware Insights

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

This PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains text related to saving web pages as PDF files, likely a lure to encourage users to click the embedded malicious links. The presence of multiple PDF link farm heuristics and a high ML classifier score further support its malicious nature.

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://queure.ru/uplcv?utm_term=save+web+pages+as+pdf+files PDF link annotation
    • http://africa-emergence2019.com/userfiles/file/rutixemu.pdfIn PDF document text
    • https://majubesar.info/contents//files/27616669611.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/l2nhvgsb1171vjushtf1kd1hvk/zenubaletagi.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1606d68447274b---80649168747.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/53522309300.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/42832230053.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/35431424935.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/71623452393.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/jomizikebokapo.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/hpgj7a59qmdu0us555ifqniio2/ladujeradujakijibo.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16076ead7a4b33---4938085544.pdfIn PDF document text
    • https://istanajp2.com/contents//files/vototezaloxawivabasibo.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/t6b91o50vnmhuno1vh10n7vkd6/96326714239.pdfIn PDF document text
    • http://austintownfitch1980.com/clients/879833/File/keduremifutezebiwikexin.pdfIn PDF document text
    • http://beverleyannes.net/home/beverley/public_html/ckfinder/userfiles/files/18232725472.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d84a6a944---xokonixebifofosezi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54B 5508 bytes
SHA-256: f961548eccf552a0f65e3103c54e2742bf4904926697343575d56a6619979bd0
font_01_sfnt_off0000e82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82A 10052 bytes
SHA-256: 7f00d82ae2cfe23e3ecae1c6ea44e4c111db96043bda18870d8075ec5504cb1f

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