Malicious PDF — malware analysis report

Static analysis result for SHA-256 c311a38d56387870…

MALICIOUS

PDF

59.8 KB Created: 2021-06-20 01:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: ca36fbb45c485f2cf2a8d0f650645405 SHA-1: 3cd82d50cbfb5e293c77bef6fe5f08dc7793871e SHA-256: c311a38d5638787021b450f6444879dad0aff3d4130d1226a888b4228be33443
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to various websites, many of which appear to be compromised WordPress installations or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to redirect users to malicious content or phishing sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://huntic.ru/uplcv?utm_term=taro+ne+pucha+hajaro+se+sabse+pyara+kaun PDF link annotation
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/97583377227.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/juvif.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf444f06f8---8603253945.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160b23dafd649d---pafuvebun.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/0haja3poel7f8aaouenj1ne7d3/93449844623.pdfIn PDF document text
    • http://bennyhigh73.com/clients/3/33/33ce00c6a031cf3b17a3dcf69aaa7594/File/jisuropagakix.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801238ca2ef---38658476599.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/wizikevimobebusivakiseven.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/c6c097d4bb0270d6571d1556d143488d/suvokekutidobi.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/sumasosuxemof.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/72472994343.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/86446492358.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/ca93bbf891666e0abec1e19f0b49bc71/65988309949.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160746fde5573a---ladiwejakonoraxirawo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF35 5320 bytes
SHA-256: 651b01fdd9bc081aef07a3ef9ea31ad0220cced4d33aa51a8c6fac847d8a6bb7
font_01_sfnt_off0000c14d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC14D 9704 bytes
SHA-256: 2151ac2aa2cef015b936e778b2d2442e84b9600c21aa4705657a75c01521125f

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