Malicious PDF — malware analysis report

Static analysis result for SHA-256 b56a35d9f69486e3…

MALICIOUS

PDF

71.4 KB Created: 2021-09-05 18:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ce3836882702503a4215c2c47db8eab4 SHA-1: def91b31bc5480a590cf1b6a17640db090d136ea SHA-256: b56a35d9f69486e32c55f7afe716b0729af19144f91c89d2650e0e8f808c22d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://thecrayfamily.com/clients/36408/File/48035482970.pdf In PDF document text
    • https://fcimoveis.com/imgs/file/zepurat.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/43665649602.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/loxinijizurebobafozud.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/0c7fc98687f603a0edb05bbf8eb49547/4177015981.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/mutofapupanikuwu.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/nafiniba.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/besewapoj.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/20418914614.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d573206a66e---56087095985.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/2cu55pk0n6hd2rfdkjkgl90bji/13690984030.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/rapulanitepopoxujafid.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e22c34561e0---pasewa.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/a17916b4ffc4f3402b32cee9d8446258/pododalu.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/weloledutik.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/38985622118.pdfIn PDF document text
    • https://migger.dk/userimages/file/wifobaliwogu.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c025dfdf9---8144217547.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/44699544472.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/77850595001.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/7da6667780d08c2b2e1aae4a0cb2ca65/38929231673.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/lapelowegevobarukewalos.pdfIn PDF document text
    • http://compsult.net/userfiles/file/95162542765.pdfIn PDF document text
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/movapibobegi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=10+day+green+smoothie+cleanse+recipes+pdfPDF link annotation
    • 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_off0000b365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB365 11256 bytes
SHA-256: 5d7a7a63b22d496c881fa9ca44d66ece3be546b2d05759b0890a5ffaa53b844c
font_01_sfnt_off0000cd69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57B 17484 bytes
SHA-256: e7f36eb8d34dcbb4cf42c468334d227bae83afa77b04d8947d189d8700692470

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