Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d179e03ae9df928…

MALICIOUS

PDF

85.9 KB Created: 2021-09-16 11:12:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eea27abeb5f30907f36d172333d6173e SHA-1: 419c3c6a4467f8d343ef4d3a8f563e737e5341db SHA-256: 4d179e03ae9df9287d4dcbb7c32712967fc984a9f33770d2f515e140033fe2cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs pointing to disposable hosting and compromised CMS upload storage, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://jatransfer.com/userfiles/file/pevijolidoxili.pdf In PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/ziduboforimaposomo.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/lanafixu.pdfIn PDF document text
    • https://codecs.ro/images/file/59189434102.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16133180512ed7---29352845796.pdfIn PDF document text
    • https://onecre.com/images/content/files/movulawezawolomu.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/zisojaremovafud.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/begurupelategi.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/56314587107.pdfIn PDF document text
    • http://khonggianxua.samdigroup.vn/app/webroot/upload/files/26178594940.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/zapevepodorot.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/ruxija.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/46467927816.pdfIn PDF document text
    • http://fitviewer.com/files/file/lufegevolanab.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e68776ffe---jadabobesinefewu.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/53291183907.pdfIn PDF document text
    • http://canissapiens.com/images/uploads/file/soxosagetimupopaton.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613816f54aa32---16549038066.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/bajifedumilujenonofunupuj.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/kojijutufasixepoxan.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139215f87040---70700395557.pdfIn PDF document text
    • http://jlssj.com/qianzi/upfile/case_editor/file/mudoferobimimo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=animation+video+app+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_off0000ed01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10518 10492 bytes
SHA-256: 73be884858e83a1094c65c38b4709d75cb9e6402a5d5b747b567aee82e827025
font_02_sfnt_off00011cec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEC 17332 bytes
SHA-256: 20933638eeec6e311bc0fb11febf4cc9422b2f33fcb26c3a203b5dd05655f475