Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4fcab337177f093…

MALICIOUS

PDF

78.6 KB Created: 2021-09-24 05:50:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6711289316e1e5c97bc6b5100fdcca4b SHA-1: e887e33354ec1ebee08c922e3c4bc5f16da11ba9 SHA-256: e4fcab337177f093b34dd28a25a7a87c92ca45bf3deeb0ab7f3d5631a8320598
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to distribute malware or phish users. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://pixomot.ru/uplcv?utm_term=cara+download+buku+di+google+book+gratis+di+android
    • http://cerezolorente.com/files/cerezolorente/_repo/file/gamemutafisam.pdf
    • http://baozhaopharma.com/upload/files/864693995.pdf
    • http://jaqalsports.com/files/file/48242944608.pdf
    • http://tythb.com/uploadfile/files/lutafade.pdf
    • https://paramourpourbebe.bettygagne.ca/userfiles/file/somoxisuxurasebuzusavodot.pdf
    • http://p-itos.net/admin/userfile/image/file/senodugixesabowibavuxu.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408e6d1d357---84270214573.pdf
    • http://afghansolar.com/userfiles/file/52419571585.pdf
    • http://mispuntossaga.com/campannas/file/10582563902.pdf
    • https://www.hkha.org/ckfinder/userfiles/files/niwejagaboxifisoluselukom.pdf
    • http://rpsbchamber.org/editorData/file/8265965823.pdf
    • http://stalmont.eu/userfiles/file/6385771620.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137778625d25---mozonifejabuxaxozov.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/5af9b07c5ed8dfdf0f6b250358ac7a47/67946707790.pdf
    • https://egyptsuntours.com/userfiles/files/5286942490.pdf
    • https://ferdavagnar.is/images/fck/file/30992344912.pdf
    • https://atarentacarburdur.com/userfiles/file/favadupeta.pdf
    • http://swotaweb.com/img/upload/file/7714316374.pdf
    • http://studiomilano.eu/userfiles/files/todadodiretade.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161400c95d52fb---16451272201.pdf
    • http://se-ty.com/uploads/userfiles/file/fiwebozek.pdf
    • https://dhrc.in/userfiles/file/xudojuvezefasigatazimoluf.pdf
    • https://visualmotion.nl/uploads/file/vewivodeligamiwelotizof.pdf
    • http://udmvdpo.ru/images/files/44588295183.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd5b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5B 16792 bytes
font_01_sfnt_off0000e56d.bin
a36c2fb7c68ccdf00f7628276e4a03ac68afdbe3ca4830f1f73063ee5ceab325
pdf-font-stream PDF embedded font (sfnt) at offset 0xE56D 17528 bytes
font_02_sfnt_off00011325.bin
8d81718692c8dcfbdb0a9f4de0d18c92ef18725d2702c6de59ef6c30373d9cd1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11325 10872 bytes