Malicious PDF — malware analysis report

Static analysis result for SHA-256 8be2a068566d53cf…

MALICIOUS

PDF

80.6 KB Created: 2021-10-07 22:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0f6ce15c9faec94ee4cf08b5b244f713 SHA-1: c830b3b105908d35856fe4cf3432abb42fcc07d2 SHA-256: 8be2a068566d53cf88bbbd0ec9034576e655bf3aecf4f75bcf6d7cecc130dfeb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which appear to be disposable or compromised hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this analysis. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cructi.ru/uplcv?utm_term=sda+fda+old+question+papers PDF link annotation
    • http://fulns.com/uploadfile/fckedit/file/1632315933KsmM.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/11742635210.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/mejefe.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/21395463456.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/48971756615.pdfIn PDF document text
    • http://pedraferro.com/files/files/luwudexi.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/651f63b06f33f48e9073479930ee2bbd/noxuvumu.pdfIn PDF document text
    • http://nguoiquangphianam.com/uploads/files/daweluwutixewozotevunofux.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/texekowotu.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/86908160717.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/mulidatolex.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1615d93fc47b96---bifoxubake.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/39597453108.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/4197030098.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/nabusubutabumufininus.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202110041827438005.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/dunusexone.pdfIn PDF document text
    • http://musorcentrum.around.hu/files/article/file/masumuv.pdfIn PDF document text
    • http://mps-india.com/userfiles/files/gokobanujoxule.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/kuzuvowulanudimeb.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/16351734821.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/ladevazoxax.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411460bcc06---11653984105.pdfIn PDF document text
    • http://www.tecnologycenter.com/admin/uploaded/fck/file/59982123270.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/40243391501.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_off0000d5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0C 17936 bytes
SHA-256: 0156e10772111cd573b6f2d2f33d8888056236c72ea07ca17697993bc45006ff
font_02_sfnt_off00011be8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE8 10812 bytes
SHA-256: e10927f74d59e4723d27ee1477cc00cece56d591c8d0f46cbbd9cdac74463636

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