Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5be5a6c8efab533…

MALICIOUS

PDF

83.8 KB Created: 2021-09-09 09:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 89c0eb866907323f8335e7870b672747 SHA-1: e7ff5f277a82a054842ba7ca093773305a43a4ab SHA-256: e5be5a6c8efab53354d074deeba16fb349e92339fbe5f5d2fd809568f789ceec
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The presence of a 'link farm' heuristic suggests the document's primary purpose is to redirect users to these external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=papercraft+pdf+free PDF link annotation
    • http://jacsonsfurniture.com/userfiles/file/luwuve.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/161321447d2c01---58792263673.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/41355582358.pdfIn PDF document text
    • http://beijingteye.com/upload/files/49898132629.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/mipamopabuwawujifirofip.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/bazaxabakivakos.pdfIn PDF document text
    • https://petala.gr/userfiles/file/fegurove.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/69435170529.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613998adf102b---33493830905.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/092e2d27bec30f0844426c1a8293a555/48864221563.pdfIn PDF document text
    • http://firstcuwire.com/file_media/file_image/file/72593628523.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1613098c51827b---61550251401.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/sonuxuwenixogake.pdfIn PDF document text
    • http://th-hl.com///upload/files/doduresovevimo.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/fafizogedelisoninalum.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/bodirefilerope.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/59073316672.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/87006485262.pdfIn PDF document text
    • https://techlan.pl/files/file/kugipejorixujibivof.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/biruwuzusukakogujinemidik.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/kizejelofusulodo.pdfIn PDF document text
    • https://wineuniverse.us/userfiles/file/buzoxivapet.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c637050ab---wunanibepupanofuf.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613205a2ab7c2---lejufopugamubaz.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_off0000dfa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA5 10084 bytes
SHA-256: 332f93edb71d256f72912f74548c1cb505698517d64d94d131df2861205dd0cb
font_01_sfnt_off0000f63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63D 19540 bytes
SHA-256: c821ee1de42e093629779af02475c5325915f59957a2fa24b5bc29e454c856c3
font_02_sfnt_off000129b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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