Malicious PDF — malware analysis report

Static analysis result for SHA-256 d03c2f2a8a87d0e3…

MALICIOUS

PDF

85.0 KB Created: 2021-09-19 20:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 46f3349cbb3cf25a82e0d6fbdf0e401e SHA-1: fd622595546eda82effeaf55c06fba21fa0b4bd2 SHA-256: d03c2f2a8a87d0e3a9a5f3c761b90302b6737873964db03b4cf7ac5d3abd5073
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains malicious content. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests it's designed to redirect users to potentially harmful external sites.

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://dexgerm.com/data/file/userfiles/files/xivediniviniwos.pdf In PDF document text
    • https://congchunghadong.com/uploads/files/46903715878.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/60231552243.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/023d919cf32f11de8bf851516089f673/xusegomotoxusarabumapo.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/mutagetowuvadaxagukujena.pdfIn PDF document text
    • http://asqcert.net/files/files/ribevokanipiwu.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/nudata.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/ranakowikimomizinu.pdfIn PDF document text
    • http://uhorder.com/upload/files/54054791408.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/jivexufusinebodisobefuj.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/7684981784.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/48356903976.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/muzoleruwibozubasep.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c851f48437---vonofe.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/wutapogebujageb.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/k6rtihpqllpn2ujuo9fuqjs9n1/68484112341.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/sibosujibolemuwosim.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/lugojisamojaxikow.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2ff184703---sezali.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/47303298777.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/turerabusixefezilofugu.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/10698299123.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/powojofimapeguw.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/vinoforovajegijero.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=best+games+to+play+on+your+phonePDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/kiraguj.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_off0000e57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57E 18164 bytes
SHA-256: 98557112b0f461093c3320512910631927d4d2644495e825febb2b9110186c03
font_01_sfnt_off00011525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11525 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3C 10872 bytes
SHA-256: 8f354ec32854bc297b1e3e979902fba965e1d45d8c35070d92ff96ad2ae9c0dc

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