Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc69586a7ec326d…

MALICIOUS

PDF

87.3 KB Created: 2021-09-07 11:33:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9ea547e49ed69f6307875d851f290d34 SHA-1: 73a523e0a6d53798dc0c70b890a30ed64695403d SHA-256: 8fc69586a7ec326da6a5adc99c48a8bb37327cd3a899d4d6486f0b852c3109c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. It contains a link farm pointing to numerous URLs hosted on compromised WordPress sites and other disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics strongly suggest it is used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://krisoc.ru/uplcv?utm_term=les+collectivit%C3%A9s+territoriales+maroc+pdf PDF link annotation
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b59d2229d7---56175456218.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202108200642255642.pdfIn PDF document text
    • http://danburyhighclassof1961.com/clients/b/b4/b42d7d7907ff1a67dd6fd366dd3c6775/File/33166653929.pdfIn PDF document text
    • http://technoprofile.ru/userfiles/file/xesonuwupido.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/ed6b62acafc0aaf9a50ee504c0c43285/4855867862.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/93078592434.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/wofusabadafasop.pdfIn PDF document text
    • http://51-lq.com/userfiles/file///88407743266.pdfIn PDF document text
    • http://onlineexpert.in/userfiles/file/77083633343.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/92988523979.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/gipaz.pdfIn PDF document text
    • https://pendekaremas.com/contents//files/pewoze.pdfIn PDF document text
    • https://ahha.az/userfiles/file/27751042694.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/14897668326.pdfIn PDF document text
    • http://ktcz.eu/files/files/80877890493.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/bngqjeljo4p8ai6aev9epfcvgu/63208178130.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ed2e42707---72151109177.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/jinovir.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/91dd1e6cd5cb22cbaefda980e234a1a0/56758815612.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/wexowojovetet.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c925f21a---33332264768.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/74223152513.pdfIn PDF document text
    • http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/tubusumirakuguze.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/suxupitazawolowijisamato.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/amgm0ir7n4glagmuq3i1m4idac/gomugiropojav.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_off0000e460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE460 22092 bytes
SHA-256: b7b2916d575f6e5e34593f18367d77da1e93c1f7fadfd0397df0dcd28b484a52
font_01_sfnt_off00011c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C96 10856 bytes
SHA-256: 8561aa96a7b2f085ec20706b2042f8bc34fc4100584504bcb7e7185b0a2193f3
font_02_sfnt_off00013567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13567 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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