Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4c7837cc85e54cb…

MALICIOUS

PDF

83.0 KB Created: 2021-09-21 07:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d7e50359c9f902a7eb680b7b70877e55 SHA-1: cb2c267ee76324810349bb735fadbd9f9935b176 SHA-256: d4c7837cc85e54cbd27ae689d8a7054f7a91ed0c2fb955ac752ef4ac3949a2d6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file contains embedded JavaScript, which is often used to redirect users to malicious websites. Multiple heuristics indicate the PDF is part of a link farm, with many URLs hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=applied+engineering+mathematics+pdf PDF link annotation
    • http://cancercareresearch.com/userfiles/file/50993974997.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/98132337336.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/lapum.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614138d78eaa8---65808904335.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/tevimuvozezorivapewiwuju.pdfIn PDF document text
    • http://reflita.lt/uploads/files/faseguxatajolelukenew.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/27152181044.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/640e9c8e19e9b34552d3d698933248a1/31892367458.pdfIn PDF document text
    • http://dobermanncz.eu/files/81471878647.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec5ce124a6---164506284.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ad8b73b14---66254866819.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/41105417415.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/xidirapemunivubov.pdfIn PDF document text
    • http://homeopathyhk.com/files/zudaguxumituje.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/vixibenozusazura.pdfIn PDF document text
    • https://fong-cai.com/upload/files/zisuvekigovimevu.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/50222407538.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/bivituvesizizowakivomezo.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/2a3k6olts0hvanpoks6ik27677/80285933774.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/46245136423.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/76726022787.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/17643755377.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/kekivali.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_off0000ddcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCD 18324 bytes
SHA-256: 1718f19a8d5b7ddc8f2fe75aab819b4f915dedcc66ee7451fffe47125cf9413f
font_01_sfnt_off00010d75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001258c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1258C 10928 bytes
SHA-256: 8f840a651d3b2a668fa0c31146b416b18708221ca24f4ab40e93fc30db77075b

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