Malicious PDF — malware analysis report

Static analysis result for SHA-256 731c08ee0e2a1b86…

MALICIOUS

PDF

81.2 KB Created: 2021-09-07 10:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: db7b71bfafa3977d017e2b64b40c9657 SHA-1: 634d1f1dc0fad012bf1cd102044f465e1fa57b49 SHA-256: 731c08ee0e2a1b86b3a011b73f5cd3840a772dbeb61747a5c9a04b5bfd65a4f9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan delivery attempt. The document contains a link farm pointing to various PDF files hosted on disposable domains, likely intended to obscure the true malicious destination. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document's purpose is to trick users into downloading a password-protected archive, a common tactic to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://self119.net/upload/userfiles/2021/07/files/210723105825.pdf In PDF document text
    • http://kuppersbusch.hu/userfiles/files/zimiwakubasurilowoviwomu.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/xigefotoxuvuxa.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e5182767e0---51051804747.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/20861379870.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a94067216ac---49273043135.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/mexag.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/37790512817.pdfIn PDF document text
    • http://gotween.com/userfiles/file///maxuvokivasidaxige.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/45493725076.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160727f039880b---tuwikisarowifu.pdfIn PDF document text
    • http://meta-min.com/files/bepafosorokido.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gabopeneboseloneseno.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/76942924416.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/99198383661.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/b46sav38k0guf5qvou2hf1l160/leteramapuwidebemitisan.pdfIn PDF document text
    • http://whscardinals1963.com/clients/9/9e/9e5fab02d16e7113a74bdd4e7828f974/File/sasas.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f2bf82245---49699724126.pdfIn PDF document text
    • https://bem-sa.com/img/file/razejesamajivarivosaje.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1606f09d7657b0---13933639577.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/94782096702.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/redimovexufusoguguputode.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/dapede.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/t7k3n41gereus8dp18a010lf8c/3620536572.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/3961508645.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=kljucevi+moci+pdfPDF 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_off0000d9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AA 17572 bytes
SHA-256: 248f5196d2624f45aefe00889645f1881ebc735b97837c424071225fc9176366
font_01_sfnt_off00010723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10723 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3A 10436 bytes
SHA-256: c887935dd24c2f17cada16c86bf0b73bc6684169e074294a7a98489984c66f10

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