Malicious PDF — malware analysis report

Static analysis result for SHA-256 e86b10b719d42226…

MALICIOUS

PDF

62.0 KB Created: 2021-06-25 02:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 6c57bf9ec071a9338728a6d29d39761b SHA-1: 0697270d8747851c30492c389b8605d3eea9a744 SHA-256: e86b10b719d42226bdeb3eaab479570eef8df8e720d5198b97f25c5f293df586
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting it functions as a link farm. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://chcial.ru/uplcv?utm_term=the+stranger+film+camus PDF link annotation
    • http://www.klccpa.com/userfiles/file/In PDF document text
    • https://bdcomunicazione.it/file/gasutojikujujadisifiv.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a579a3cc6---19242791021.pdfIn PDF document text
    • http://sixtyguildersresearch.com/admin/photos/file/domir.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc665c913f2---34809696418.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/68579553902.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/43619933618.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/mupozofemujotekunelor.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/1babb24209b5ee184f6ca1c72fd6fb2b/vavomexufefalaxexibobub.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/legisekebukagevegibaxati.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adebb71b08b---vujupurusijefigabumada.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/32844b67697b81cdb98fcdd9e353e329/16610015213.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/7prldvbbovog6ukujqjk74vd73/21461877437.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_off0000b4b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4B8 5244 bytes
SHA-256: e39c59b6805e3b6306d38ccb12c59b80a76251c8a83148863053ac9026b4d701
font_01_sfnt_off0000c666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC666 10904 bytes
SHA-256: afe2a4b2976ff7cc45f1526e7ca3b9b66b66442e9a8a11a5bf38399e3533e354

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