Malicious PDF — malware analysis report

Static analysis result for SHA-256 209d839302aaf31b…

MALICIOUS

PDF

92.6 KB Created: 2021-09-16 09:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ed636a6ef1b4790418751e3d6fd44245 SHA-1: 922d1a429a77582a828f39cb1a0a4df85f47cb4c SHA-256: 209d839302aaf31b0509c2cb31770a22f4c77d6a04987766dc30198444f31453
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are flagged as compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF documents designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://zeci.nl/im/image/sujajewuwozifulikele.pdf In PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/rifizavunuwow.pdfIn PDF document text
    • http://wych123.com/upload/files/ragido.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/79772606982.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/seboxufo.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/dabizaf.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/bugozetaxezumobabemoxi.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59086545671.pdfIn PDF document text
    • https://xebecdesign.com/xebec/userfiles/file/16313456100.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/16075169495.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/nuwavu.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613de2cd3c62c---rafozimitefadexojekalede.pdfIn PDF document text
    • http://praguetransfer.com/files/file/10188696192.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/53694823195.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/69362956114.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/30905386863.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d2630dfd4---2100261193.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/simamu.pdfIn PDF document text
    • https://dortmundpools.com/contents/files/zunobamokenixibot.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/69457007055.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/gosefikesuxaf.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/7gadnjvg4sfjo7bti6ot2hjnqm/tunuvi.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/97658918547.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/zoraxakem.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/zavawirewozubetixuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=gaming+video+editor+for+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_off000106cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CC 17708 bytes
SHA-256: 80c90e971046e7bd871410b189fdedd70f9ba44b2311ce7f3f7018c8a2e5e55b
font_01_sfnt_off000134e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E5 10588 bytes
SHA-256: c4fac133295a90e2bfc843ac42a4ba6b9eaffd88a58ae860f1a342820a5b0608
font_02_sfnt_off00014ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1