Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee7c55d7673940d0…

MALICIOUS

PDF

82.3 KB Created: 2021-09-18 16:26:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f4431f64068536e2c375796b3caf6258 SHA-1: 50256c03009b422001ffce95e5867cd0ce4b2b7e SHA-256: ee7c55d7673940d05871a8541dd8d73e859bddc84087135728b4e5323380097f
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to lead users to malicious sites. The presence of external URI heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://tmkb.org.tr/ckfinder/userfiles/files/mamijabitafarig.pdf In PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c7c2e14d5---54680772960.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/14838563052.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/23520384034.pdfIn PDF document text
    • https://ver9.sonikgps.com/ckfinder/userfiles/files/33682736294.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/dirixususekibewojudolex.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/zodevanowi.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/biwojesedadez.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16141202e939d3---15638764465.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/wulegofitepepo.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a064155d45---busijeja.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/xabowe.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/jovebug.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/kiwivafomixetulejubipa.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/xalege.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/sebas.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/7528368222.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/xusawobodojugatiramisitat.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/89250874144.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/lufudumovogebemejezepetuk.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/61fde53f5b023bd9a41df8989ab34c48/84337586231.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/jegapazapezatuwobuk.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614002f9584bc---39185261961.pdfIn PDF document text
    • http://standardamulet.com/files/files/kekagavobawiwetuv.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/muwovodisal.pdfIn PDF document text
    • https://rintrans.com/files/6601264832.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+find+flutter+sdk+pathPDF link annotation
    • 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_off0000daf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30F 10864 bytes
SHA-256: ef36c99ead3a4e374a5477304aaef65d252587b04f1b7aff91013efca6fb3f6c
font_02_sfnt_off00010c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C15 18380 bytes
SHA-256: ac234f4437631ce36be60f2e4157dc926cbeeb3f26987d60caba18bf46fe394f

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