Malicious PDF — malware analysis report

Static analysis result for SHA-256 c41b00869edec677…

MALICIOUS

PDF

79.8 KB Created: 2021-09-16 22:04:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8279648d1603c45f8ed49ad3882bc22f SHA-1: 0424b0ebe69d5c33f423b1fa79901803bb5d69d5 SHA-256: c41b00869edec677c0d829ca04061b996713c6879cef2c58d2a5cad3fa0e4dc3
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous links, many of which point to disposable hosting or compromised CMS uploads, suggesting a phishing or malware delivery attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded links likely serve to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=aimbot+for+arsenal+2021 PDF link annotation
    • http://ambulatorioveterinariocigliano.com/userfiles/files/robezunenisufazefeb.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/kozafotiwome.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/zojusonamunovoxibokedo.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/levuratunivenulem.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/rilalezikigizolovadu.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/23504753841.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/vudevo.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/92976809929.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ea1d1ad19---gerusuja.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/pubeboronevoxadam.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b41ad7e5f1---34144769572.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612feaf2172c5---rejobomel.pdfIn PDF document text
    • https://comfort8889.com/upload/files/fajoluj.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/xilizazibemimovejalav.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/cf0d0026ca426e8b4014dc06d0359c3f/viledusibixu.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/vorosodo.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f384412fa3---9770140756.pdfIn PDF document text
    • http://ewtch.com/upload/files/rifapo.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/4705166244.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/gogekutefatomomuwibazubom.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/wosejuvamof.pdfIn 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://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_off0000d04c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04C 18848 bytes
SHA-256: 2ef3f2230fd5d3a7c51de1c6a90dd2a70002b07a3b38ad4164abb5711c6e9a61
font_01_sfnt_off000100b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CD 10792 bytes
SHA-256: ac4a125d0490243969f126df0056b4d669f6932178a78bec87946581bdf1c783

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