Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cfb3165b4eb090e…

MALICIOUS

PDF

78.9 KB Created: 2021-09-16 19:25:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: df5b62e730b49f4a36b642cc704ae42a SHA-1: 42d08359a3eb2a88051c8e9b737b0012552e6d8e SHA-256: 3cfb3165b4eb090ef79155cb82ed5d2dee7dc16f275dc8d93a39361d8720e98e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were extracted, the structure and URL patterns are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://www.propper-droppers.nl/files/file/litolajimetatovububunize.pdf In PDF document text
    • http://wonderful-foods.net/userfiles/file/47997908521.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/27903273524.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/73376302300.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/dagikupixofiburotasi.pdfIn PDF document text
    • http://jadeite.ru/images/file/53331303449.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/66296982241.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/tusexabijadilufol.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161309d0c84f39---lupiwopedute.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/93628518081.pdfIn PDF document text
    • http://abc-tel.ru/data/File/vimegobulobabovijas.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/jevepolivat.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/90881090990.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1631523754.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/74392661322.pdfIn PDF document text
    • https://udruga-invalida.hr/files/42678082133.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/10195876722.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/53493676488.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/pidiko.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/ruwugopivoloremejef.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/52721533768.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/78907689191.pdfIn PDF document text
    • http://chinatriage.com/ckfinder/userfiles/files/80297631330.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/161305a4f5acc9---pomitifurugozurutifes.pdfIn PDF document text
    • http://uteambio.com/upload/files/xukit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=bike+photo+background+editorPDF link annotation
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/85691873677.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_off0000ce84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69B 10964 bytes
SHA-256: be124e434995051fe2161e9d6140f603cc8cdfe15144eb6411cc1e5fe0025c7f
font_02_sfnt_off0000ff93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF93 18716 bytes
SHA-256: 6a0f5518ec06b0535e4e631714d600353700890de2bffa9f6dd4230fb84b959c

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