Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd8631c828e8b8ce…

MALICIOUS

PDF

70.5 KB Created: 2021-09-17 11:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 75b6967b4ac0a1abf7e0e13fb6043feb SHA-1: 78e5e17c1d19d0f65de4ad479d04175a27a6080b SHA-256: fd8631c828e8b8cecafb4e4524a7666c00cdfeff9fd34c7e3b136488a43679a9
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous embedded URLs that point to various domains, some of which are hosted on compromised CMS uploads. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement with these phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://s8radziejowice-paszkow.pl/userfiles/file/40711457702.pdf In PDF document text
    • https://tallerescarrion.com/uploads/file/pininude.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/24805846909.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310dfbafef6---71378574956.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161331bdecbab8---77211592236.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/80900111712.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/1172050990.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/66957391136.pdfIn PDF document text
    • http://albergocavour.com/userfiles/files/noluvulizakakejititoda.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/1134bf15d351b36097310da7ffcedcba/papesatawu.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/82272880961.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/78257313010.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/22278258381.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210902080348.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff804ab466---66942508567.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/mukebalofatoxi.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161374d2d10d7d---76016584204.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/retopajoba.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/73479513214.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/rojixa.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/3280417632.pdfIn PDF document text
    • http://workontext.ru/media/file/81255557751.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/ludumelog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=calculator+lock+premium+mod+apkPDF 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_off0000b3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B0 10628 bytes
SHA-256: 868296b3577559c6bed89f219710290f0ae81eb53866dfa9b2685ca476315983
font_01_sfnt_off0000cc0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41D 15924 bytes
SHA-256: a42e53e9174546751a5648f0d03bebe6e719ea4e4bbd2404909d057ef4d66bdc