Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbedf90caa6237ea…

MALICIOUS

PDF

100.3 KB Created: 2021-05-15 17:04:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1e50faf970768119a7092bd3143c750 SHA-1: 2773abc76db87868b846119e20fd2ba0d66bf71c SHA-256: cbedf90caa6237ea9b70861f193059f63acbf5af22562ef52f2e0747afe980ac
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's a phishing lure related to an Australian visitor visa form. Multiple URLs point to compromised WordPress sites hosting PDF files, suggesting a phishing campaign or a distribution point for further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an attempt to trick users into downloading and opening malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c13d259299---84720635325.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/aced26be082487f81fc8368a1c5858cb/1508294227.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/7tq4afm7d8qs18paajdpj0rhth/37279613146.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16093f6fdb7cb7---16599586705.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081be34e02c1---69261452529.pdf
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/bodidatataribotewusanali.pdf
    • http://phantasos.org/userfiles/file/54575438870.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/f41f1c2ed194f397f63324a370976d17/jirevelebasasep.pdf
    • https://atlastoursntravels.com/userfiles/file/16494520997.pdf
    • http://szrealty.net/uploadpic/2021-5/file/2021050918305473499.pdf
    • https://damiel.eu/userfiles/file/68039286514.pdf
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/23e7697e8d929fe3266d5ba112d815e8/zegenibukujarisuvutegozo.pdf
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/f7ad2e61cd710e1cc75175db5a3feb60/9719602719.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/fcdcaf15c2a19ea3a6bc22bdc8719e46/vemivunagi.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070962039661---xidisovimexu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=australian+visitor+visa+form+1149
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014b1a.bin
c43e70794ab8793ea828d6c9e6687ca83965683c4835020a590aeb094b676bee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14B1A 5260 bytes
font_01_sfnt_off00015cf7.bin
ff605d7ed63348b3875ed8a1c516f201352f52560b61b766b5f1bb20f6867e2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15CF7 11196 bytes

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