Malicious PDF — malware analysis report

Static analysis result for SHA-256 16c10e28e122fd22…

MALICIOUS

PDF

79.7 KB Created: 2021-09-18 12:37:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f2243e1915d75484b2dc2eb2373635a0 SHA-1: 5604c8366cd58c1dc67be5899b53645fe2d43f3f SHA-256: 16c10e28e122fd2213d9c894c032763154a2953190fdd8f67da64338ecf75406
154 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution lure. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6331

Heuristics 5

  • 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
  • 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://mclandpin.com/calisma2/files/uploads/mokurolamo.pdf In PDF document text
    • http://peneleos.pl/userfiles/file/19469515921.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16140274675b68---48678873552.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/kavetagetomosedezom.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/86589761531.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/91580326678.pdfIn PDF document text
    • http://cocoal.com/uploads/file/62001850024.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/wudenedesapupova.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/gofezibakorumiwemakoparu.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/87496914015.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614557f1d1898---wudikigenadijuwuwil.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe6e9ed527---xasovugasimozaforaxoluz.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/zubugedetozipoxifupojonox.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/96448720717.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109080521529663.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fafe07fbe8---gavizu.pdfIn PDF document text
    • http://sfalojistik.com/userfiles/file/79758133580.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210911_E22AAC9A592E244D.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/66038831319.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/sixasibuvoxufoxoxelepe.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/33740679629.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/vuseju.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/rawelotoramilorub.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/pasovukabufodunubumiditul.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/mugozozaxexutuvas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=new+movies+sites+2020PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001080b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080B 17440 bytes
SHA-256: 152a3bd77ef6da3b7a9437ccfc4a6df1503dc232b880de635556125478877325

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