Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c0cdf5ceb9e7891…

MALICIOUS

PDF

85.1 KB Created: 2021-08-08 05:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 96a5a6e7a3d1c4e5fc5c16a0fb8620f3 SHA-1: 9b57ffdc82ccf3758be7925cd6d1bffe08bed14d SHA-256: 2c0cdf5ceb9e7891dd7140f617d37014fcdb079030fbaf15351ee55659440779
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to WordPress upload directories on various domains, suggesting a link farm designed to distribute malicious content or redirect users to phishing sites. The presence of these links and the overall detection by security tools strongly indicate a malicious intent.

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 http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16091c25071c54---8710238491.pdf In PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160831b79b9890---zufewusoxiduselopukuwo.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/90817044890.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/3dorn3bi4p9ukhkqunvjmlgim6/9866780573.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/banomokelewukovudupor.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/85025873085.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608146a88c49c---favemodotejuretivigotupes.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/50124534599.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/gelakivivarukipofu.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/fuzizobonan.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/sagaguxeguro.pdfIn PDF document text
    • https://ahha.az/userfiles/file/jixezukewikibatukidi.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/kaverotelaligorimila.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f2187a1b7---98756221314.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084b01ad8e0c---20300049039.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/jegesimera.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcfce5500e---gewokewilixomun.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/vepepatig.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/81871121808.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/92015755468.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2npnto8uo0gmibe7kc9af91206/vinikesatuzajijixil.pdfIn PDF document text
    • http://20thhelicoptersquadronreunion.com/clients/71358/File/78484262556.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/regebetezanilowaro.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/kowemus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+auto+update+appsPDF 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_off0000eaa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BE 10220 bytes
SHA-256: d56608fc2fdb32c5d7bb92fd60375e13b131db3dd61189a9b586d7db25ed78bc
font_02_sfnt_off000119dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DD 17244 bytes
SHA-256: 2cff5c5eedbd4fff96e1a0db74d40a9cef03f52be4e6ce10672887b76e9d7b0b

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