Malicious PDF — malware analysis report

Static analysis result for SHA-256 71f3cefddfccb44b…

MALICIOUS

PDF

81.3 KB Created: 2021-06-12 08:21:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 8585b5649fa3cd08cccbc763b975a109 SHA-1: 01f01267844d862b9b73a1f9f057c379384552e0 SHA-256: 71f3cefddfccb44b4083ffdfa5155415e52febb6bb2c877645deda8ec6a61c36
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous external URIs and links to compromised WordPress upload storage, indicating it functions as a link farm. The embedded content, though heavily obfuscated, suggests the document's purpose is to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://irlanc.ru/uplcv?utm_term=nmap+live+host+discovery PDF link annotation
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d174d8e21c---vutudewujojuvowik.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/61776885929.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/rvjq1nfrqco80o8i8iqiuclr92/44114642288.pdfIn PDF document text
    • http://jarosi.hu/files/file/81850577818.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/40544155396.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160840fe12184d---numuga.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/27033481645.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/vawavitenigudipifilowu.pdfIn PDF document text
    • https://agermag.ro/mm/file/1027456398.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/b08d1959012c67e87bce6ef04875ce81/80287919041.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/kikitefopubebixisuli.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/85718539414.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/48863632059.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b39ce8a7ba9---6921311050.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/8575e7db98024a48d724f2e584668517/fowasafugebapep.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3a10cef89---97495845099.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/dutaratepalijetebodino.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file/%5C/kumifewovi.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_off0000fe12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE12 5444 bytes
SHA-256: 1ec677a4138365ebb26da42fb87f321f90904bf422b83f6a952ea2cc2ac69b31
font_01_sfnt_off00011074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11074 11856 bytes
SHA-256: fa8be9fadf1e4874c50c52e8b7e487bff3640d0b4faf8f513c760a5992ae5b59