Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0c5647dbd428e27…

MALICIOUS

PDF

72.9 KB Created: 2021-09-26 19:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 96940fd6498efd38e39a1ed2989f3477 SHA-1: 32cb8cb65654926ed043de5a73e7464a976f70a5 SHA-256: c0c5647dbd428e2789513387d216373d1d858493b48c604bb1d885228cf9a253
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and an ML classifier. It functions as a link farm, with many embedded URLs pointing to various websites. Notably, some of these URLs lead to compromised CMS upload storage, suggesting an attempt to distribute further malicious content or host phishing pages. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://stefanourso.com/public/userfiles/file/suvumizapovowaditoba.pdf In PDF document text
    • http://aldo-ins.com/userfiles/file/95821652901.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/dufugexiwezanibo.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/kasudakekugubu.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614caf28e8885---pibufubezelebez.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/siwugozikorike.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/jakupapus.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161509c3928467---xasetane.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/lukobiwaxebuxu.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/todomasabomiwolik.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/4617917049.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/66092702964.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/jujabaragepuraraf.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/83700862416.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/gogepozo.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/86535264491.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/41150998295.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/jevadazu.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/firasutevefuvos.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/92895442108.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/goxutukik.pdfIn PDF document text
    • http://wernitznigg.at/files/59477921421.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6a7bb58f7---73928706906.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021092300223573499.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f40fef2433---14581780486.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/sanusowirura.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+do+a+three+way+call+on+androidPDF 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_off0000b76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB76B 10492 bytes
SHA-256: a0c3a2300a8918e81beec260f306efcac508f8b59b8016c8901a3daedf734101
font_01_sfnt_off0000cf2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2D 18632 bytes
SHA-256: 9d154c6b0428eb12ddcca8125b5926488826e05a3c020fb36e1422e56770131a
font_02_sfnt_off0000fd46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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