Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c269af127a5a2b9…

MALICIOUS

PDF

76.8 KB Created: 2021-06-11 01:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: f80a71d2ea8b17077fbe7bcbb5f91100 SHA-1: ccdbfc76fa9cbc1fe5ca76de316e296e753e6d93 SHA-256: 9c269af127a5a2b9a2aca41d57b5831f94111e0155a76ca486d3f1c5b8f2bb7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to a variety of domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery through these links. The document body is heavily obfuscated and does not provide clear textual lures.

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://oniceh.ru/uplcv?utm_term=circe+book+chapter+summary PDF link annotation
    • http://intergeored.com/upload/File/degonutexamuwolu.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/dorofu.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/betiropiwukuw.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/2241b83bc15285492263fc4c03b5328d/vosarata.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/konawizosexes.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/jhhdtv16eualit78gjjvf24oev/jofakivenogepeketuvawot.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3428d81f64---zuxuwesexadedijodopale.pdfIn PDF document text
    • http://cdhsalumni.com/clients/28864/File/bewarafem.pdfIn PDF document text
    • https://eternalbliss.net/file/36727963722.pdfIn PDF document text
    • http://targdenunti.ro/userfiles/file/78396171230.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160884a38c5b62---sajunixazatuz.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/borabokupik.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d02b126c6---majakuwazedebide.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbcaf91b19---wuwajaxewutejewoze.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/956c6d6cd29419c0c4fcfdbf0116beac/86226728119.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/3jhmfom178017hdfl8r2oj4lvl/newibiti.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1f3173e86---lujesuduja.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_off0000f06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06B 5352 bytes
SHA-256: 8f46cd765a638952796bd4a98c55a1a41e52eec8d072030d43ac172460072e9d
font_01_sfnt_off00010274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10274 10628 bytes
SHA-256: 99d56fd416394f73ef660087516177e88289df53812078136216f47ea260006f