Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c616cd9a977a01e…

MALICIOUS

PDF

83.5 KB Created: 2021-08-10 23:44:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d608e473765b36085b4a1a674311d829 SHA-1: dc383873608d25775ae2fe4a48c77bed624f2936 SHA-256: 2c616cd9a977a01ee0ddcb5135bededc38852bbb7d6c3c14d349456d0ea915c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple domains, several of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware distribution sites. The document body is unreadable, but the heuristics and URLs suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/jv62eo2phjgjv312brfe3a7a04/ramup.pdf In PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/matojiremigibomunivofod.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8946828477aec205821c3d76a015139d/47909902326.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/28983e57c6e669f7781c39a8a66350fb/27817127635.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/kolazabazaxofuxadexomeril.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/69943937428.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/0f1e3de9e1ccfb25bf7761c7e5d899f8/36557803907.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/99848653048.pdfIn PDF document text
    • http://pjteam.hu/uploads/62104308151.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c35dcba78---xevenipozaza.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/ea5d0af1c1540f0302365e47e9c20ad0/radoguw.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f388075ce50---nebaluxux.pdfIn PDF document text
    • http://22743333.com/userfiles/files/tiwesu.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc56eb6dcf---gupiminujut.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/96366815947.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/64090587283.pdfIn PDF document text
    • http://dhf-china.com/d/files/84393249145.pdfIn PDF document text
    • https://seitonsolutions.com/ci/files/32287205221.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be8ac0e9a8---70723312069.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/34569363053.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/guzumilixagavuzubejokow.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/wowadenowozuma.pdfIn PDF document text
    • http://skia22.ru/pic/file/99818592032.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=9.s%C4%B1n%C4%B1f+matematik+1.dereceden+denklemler+ve+e%C5%9Fitsizlikler+%C3%A7%C3%B6z%C3%BCml%C3%BC+sorularPDF 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_off0000d6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F0 12036 bytes
SHA-256: 35018c596d5c60a1be32643b6537e6523daddc7f2b1b913d63802bc021f71f19
font_01_sfnt_off0000f22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22A 19576 bytes
SHA-256: 880dd4abfdf7ada385d3b9bf508ce991f5cfee2db54132e5ca90ee25825f9bad
font_02_sfnt_off00012340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12340 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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