Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a6b63893edf6c5f…

MALICIOUS

PDF

77.5 KB Created: 2021-07-12 17:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1b85e4494d212bce7ee80ff5aadd4ddb SHA-1: 0836e882f27054337f7dec6eb29f1e8df80d3db3 SHA-256: 5a6b63893edf6c5f9cf2eefb8c381e2525273ab97d5b2910cb7f94891e29cb19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains. The presence of numerous unknown URLs suggests an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/q8te1cs2c86k5vksoqibbm51ff/mamitumatub.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/1f1fa5d5f9c8c9ede840d8836cf8e110/fujekoregikekeji.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813b94e83e6---17056171250.pdf
    • http://laduses.nl/image/file/5462483868.pdf
    • http://criminisiepartners.it/userfiles/files/26569980462.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a41ceb567e8---lubulegunidikozi.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1609a03aa91ca2---21170368604.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16089b6fe62cae---56564253264.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/f8604c3cad1734d2e36da387a2047def/70903021000.pdf
    • http://proxima-design.cz/files/file/wadajiwazogedokat.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/2c4ab2f9fdab95f2faa79acb0dd1e224/20786814685.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/jf5v20oeh5i5hk7ts3sp3fkl7l/31415944622.pdf
    • http://sunarfactory.com/userfiles/files/60479664300.pdf
    • http://wksystems.net/HotelEstimator/userfiles/file/bolugadovapenogarepo.pdf
    • https://pharmnet.cz/ckfiles/files/files/saduvidujalo.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c29d3a944---rigipogafulodewopajopadix.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160775cdcb0849---kuvukakajezurapone.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/0mjldfa79hta440anmeri0e310/55287585342.pdf
    • http://15889163.com/ckupload/files/25295241137.pdf
    • http://boothbayharborshipyard.com/userfiles/file/52993135540.pdf
    • http://planetamama.ru/files/file/24895747834.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8864b63878---rezenoviniteluparawiguj.pdf
    • https://my-natural-style.net/upload/files/letiba.pdf
    • https://aashianarealty.com/file/bubuw.pdf
    • https://netiko.ge/img/Data/file/kixejeda.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+copy+scanned+pdf+to+word
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cedb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDB 16792 bytes
font_01_sfnt_off0000e6f2.bin
e5be7ca2b6ff0a5f745bd672ddbbe8bdcac92370e9fd344c16bfced8eb2c0a3b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F2 10668 bytes
font_02_sfnt_off0000ff93.bin
dfec9ed6a6a5467f3568b86e8365ee3e535cd44771951539caa2c44bebceb256
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF93 15924 bytes