Malicious PDF — malware analysis report

Static analysis result for SHA-256 97bc5c70b41499c6…

MALICIOUS

PDF

85.5 KB Created: 2021-09-21 01:20:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f9bf6b249e79fcf436be486b23dd2139 SHA-1: 143f0630e99a3a8c5fde9d3b00c71628b4919fb6 SHA-256: 97bc5c70b41499c698d8fbb36525ecb875b6d065f29d866c5d18f016b6b79992
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to lure users to external sites. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=iphone+xs+max+bd+price+2020 PDF link annotation
    • http://nyitotthetvege.kastelyszallodak.hu/userfiles/files/71031787327.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/ditumozojabitenagurobosug.pdfIn PDF document text
    • http://risme.vn/files/87730585099.pdfIn PDF document text
    • https://loctra.net/userfiles/file/nojisozuvejo.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/rinunisugos.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137f366d171f---43843647297.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/12281994764.pdfIn PDF document text
    • http://strap.sk/uploads/files/5688206523.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/fedofi.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210914143318.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/jixofumosuvorajopob.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/6b583cdaee80b36377c9d189f7e41d75/fosawosatewikuxuduja.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210917153818.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/68633343351.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94120995135.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/87773372587.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/wivak.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///53130131116.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad1b49a358---jusokeruxoruwolakarumo.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/161425e29ca075---35046998428.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/29093090749.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/3c2de1dffb81de085e97979c87edbdb4/12204791644.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/panivubupelixafemiwar.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/vixufajijusokives.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_off0000e65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65A 18452 bytes
SHA-256: cb439092ebccc8e7f369e37c2cbc108abbfd8fe6ac05680aade5fa7b5b4e8466
font_01_sfnt_off0001167d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167D 11068 bytes
SHA-256: 9102c0b7e7250c80711fe554f787df219362f13d4fd40c1604a7d7b891e7890b
font_02_sfnt_off00012fe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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