Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c8874e3760abaed…

MALICIOUS

PDF

80.7 KB Created: 2021-09-11 04:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 86db628b7bafb595cdf43a037d203812 SHA-1: 976e51cb0f52a78e7dc67857e96ce4b91718acb2 SHA-256: 0c8874e3760abaede81eae645ef468ed1060aca631c8063b5d07dc01300fe381
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://pixomot.ru/uplcv?utm_term=aristotle+metaphysics+pdf
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/zipikegeguxirizime.pdf
    • http://studiogiovannone.com/userfiles/files/patoxaj.pdf
    • http://ttc-investco.com/img/files/34985779516.pdf
    • https://telechips.com/ckfinder/userfiles/files/warir.pdf
    • http://zlzljc.com/uploadfile/file///2021090201485679.pdf
    • https://timminsrenovations.ca/file/vW78r5BYPGDkZX47.pdf
    • http://www.prodomasa.com/ckfinder/userfiles/files/96120094766.pdf
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/diwuwakovivefexa.pdf
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/27876940812.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613be46113b8f---27930885350.pdf
    • https://hoatuoi360.vn/uploads/files/56734894455.pdf
    • https://ta-taiwan.com/app/webroot/userfiles/files/3381953605.pdf
    • http://www.binghan.my/userfiles/file/kuzur.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd14439d1e---59546646803.pdf
    • http://absolutelyneon.com/userfiles/file/78481266386.pdf
    • http://livestocktool.com/d/files/zuwumokefedunalokefepixo.pdf
    • https://apskarota.org/userfiles/file/24027339307.pdf
    • https://wegofa.com/userfiles/file/melapeloguraduvunijozukiw.pdf
    • http://landia-print.com/pdir/file/betugeg.pdf
    • http://quantri.thaisonpalacehotel.com/upload/files/zikureganizamavul.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329f5bc5dd8---wugaf.pdf
    • https://healthmatters.me/userfiles/file/91695409821.pdf
    • http://naturestuff.nl/siteimages/file/16935969565.pdf
    • https://mcsfood.com/images/file/40206923202.pdf
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/jodati.pdf
    • 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_off0000d616.bin
7337f25ed6e0269a13be82f67bc2245ce8dff40dfa511ad81056bb7df5bb717a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD616 10876 bytes
font_01_sfnt_off0000ef43.bin
4fd95bc24f841e187c1ec58939fb2f49d4520bea5ea083e581494c751213ca4e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF43 18004 bytes
font_02_sfnt_off00011d60.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D60 16792 bytes