Malicious PDF — malware analysis report

Static analysis result for SHA-256 13f08054d9d2e6d9…

MALICIOUS

PDF

69.8 KB Created: 2021-09-07 08:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7be67bf0dc25f03d6349338ae6d2b4ff SHA-1: 21700e689fef0ab42eaba82f20cc12ed53c5dccb SHA-256: 13f08054d9d2e6d9f04ce8a633fe0bbfa352eccf17d8d34a748b2c979636e055
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://synerhu.ru/uplcv?utm_term=exercicios+de+matematica+analise+combinatoria+pdf PDF link annotation
    • http://laboratoriologos.it/userfiles/files/34946417057.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/32196527482.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b63728698f---56658461916.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/pipube.pdfIn PDF document text
    • https://mfdesign.hu/files/file/vovuzigojerovudeno.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/gvevbqoop188emj57fsuaqmkm6/poxowoz.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/togivam.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e92319c846---51531049479.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/91596130849.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/pibejawevuneb.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/59341401470.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/nulazinedego.pdfIn PDF document text
    • http://easy-sleep24.de/shop/images/editorfiles/file/35176192920.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/99190372364.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/jekonitugu.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/42882656748.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/moxitibitibajilo.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16074b0d45262d---janexakemiruf.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/voderazawugo.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2586be0a56---63188705161.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/ruvutusigewa.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/24853866460.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_off0000b22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB22F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA41 14836 bytes
SHA-256: 1373501838acd2a966241d5b7364ff703f40777717ca731d73add70e53909fd5
font_02_sfnt_off0000efb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB9 11004 bytes
SHA-256: 6c2752dbf584fb6e01e5662c259a0f689b6d15cf4a3c219e4398e75d4754a82d

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