Malicious PDF — malware analysis report

Static analysis result for SHA-256 87ab02e3085d9a02…

MALICIOUS

PDF

78.6 KB Created: 2021-06-14 14:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 82757ff5bb5a4270d95aff9ae4f7b9c9 SHA-1: 313186e354e796ec5696306b94be0149b8c9536f SHA-256: 87ab02e3085d9a023ffcab7af6aa5baea77e4c2a0c82eba2591ae3629e9bce07
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to compromised websites, many of which are hosted on disposable domains or use URL redirection techniques, indicating a phishing or malicious content distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The document body, though heavily obfuscated, contains a string that appears to be a search query, reinforcing the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://irlanc.ru/uplcv?utm_term=ap+classroom+unit+1+progress+check+answers PDF link annotation
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160acc8ab8471e---73157390305.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/4rliv0be24dnboerv03t6t0uc7/nemukabozaxagofijozumag.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caf6529635---73407761458.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/rutagi.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/4981046896.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/jupozulezipuwuwulifotazu.pdfIn PDF document text
    • http://cjatkinson.com/userimages/8187101951.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/379ae7de5ad73b2e35583b958e89c6b9/muripijitukidud.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/pufomal.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/1rtbai9o1mgpuj92ppbrq0jj33/zizatigami.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088339773265---mowedimapijifuwebipaludod.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/250aecabd29ccead0a3cdfeb0029278a/vobifizu.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_off0000f0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DA 5544 bytes
SHA-256: 88c77033252b51ac78cec4bf4f76409605044635630ffff9beaf225bf49d5e36
font_01_sfnt_off000103a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A0 12376 bytes
SHA-256: 7d5eaaf89b9ef10f033e770adef97d762ecb47cba4294c872b33facaeff5e128

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