Malicious PDF — malware analysis report

Static analysis result for SHA-256 6101e6973b98f815…

MALICIOUS

PDF

87.7 KB Created: 2021-06-08 04:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7efda8797d1d58d39deddb62fae2a6c8 SHA-1: a5a07bfbdbb047a8c84e26b0401248e64eef105a SHA-256: 6101e6973b98f8151f7c6a95d2d2278e93e7d9cb3ca7af758896ca4882253078
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document uses a lure of 'makkar ielts academic reading book pdf free download 2021' to entice users. It contains a link farm with numerous URLs pointing to compromised WordPress installations, suggesting an attempt to distribute malicious files or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9619

Heuristics 5

  • 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
  • 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://inwebjor.ru/uplcv?utm_term=makkar+ielts+academic+reading+book+pdf+free+download+2021
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a37918bee---xaropagoder.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/04e87f6b2fa7c55c16eb417ae106ca0d/ruvugakar.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/931446350827ad0fbdc4971b5e7243d1/80188548623.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/3e658ae71fd7dee47d8ac690b8717643/37150779350.pdf
    • http://kemenyseprosiklos.hu/upload/file/fatuxojuta.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1609245cf93a96---197700952.pdf
    • https://a2designbg.com/userfiles/file/solidofelarita.pdf
    • https://ascinfratech.com/clientprojects/trading/file/67189455330.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a4cbf3817---80376934296.pdf
    • https://soudurelauziere.com/upload/editor/file/66980358773.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16089f7528c50d---deloda.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/2ef65ccec5cebac444415f05f19379d3/93141551401.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/52772250a5ba7285213910dcbbddf754/xafajatideze.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1607e79f401b0d---91273268772.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1f4a50486---74279276944.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609855cdb8131---gegumedana.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d611132d7d---37873573517.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013296.bin
26b7cc2dd01e9ee4bef7d423c6c3350d5b00bfc4669e6a5719949fb596dc0996		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13296 6104 bytes

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