Malicious PDF — malware analysis report

Static analysis result for SHA-256 367b7ab85b268954…

MALICIOUS

PDF

88.9 KB Created: 2021-08-02 02:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4bc88088a69b86b0f637bd6787e86aa5 SHA-1: 37df6dae90507581b7cf867393ae06e041f69690 SHA-256: 367b7ab85b2689548144a2ef07c74d59de805a023c567cba2c54f925a9fc2b10
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm for SEO manipulation or to distribute further malware. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160add3bf5cdc7---66307915829.pdf In PDF document text
    • http://446888.top/userfiles/file/33614972648.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/28202185781.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607010495c9f0---38171014465.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/81000745621.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/67711563376.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/bebasopizajaxekezujasi.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/muxokevofowopowemidokane.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160af6b4d485c4---lijovexa.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/96450655598.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c79a49908c---darabuw.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/b9u96l0865422ncp4toq0qtfen/85317006160.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/lobugogatatalivodizoz.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acec225c757---pigobowiguvif.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/817931e1eefe6b928a07fcb9db7e9865/gazutifajekedogafudi.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/251337377521.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/peserezexosederamalu.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/13271348247.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/f0cd33fd0e604ec134270bba50ba8bc9/baxiwomewedolufepixowi.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba2d59335b---ramoburabavuf.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee57cb12b9---47563047651.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/f8d3827443e7b0d284bd314da4b748b5/36258845378.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210715_CDDD38B77F8579D4.pdfIn PDF document text
    • http://klefmarken.se/upload/file/90922807152.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/l1rn9gf3nlmjt70vu4ekf3vefs/15201940623.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2582e11d34---13686140291.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=physique+d%C3%A9finition+onde+m%C3%A9canique+progressivePDF 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_off0000f39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB6 11600 bytes
SHA-256: b0a160f102a901f68f8ea405a8762bf6f6bf879ab05e6b6f5d7e5b15c9f4f857
font_02_sfnt_off00012658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12658 17208 bytes
SHA-256: 37c160aa74528e0b033659f7beb04bc818d20930a699c5de7e6ae02d3b5fa88e

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