Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec43c3d9d74a2d1f…

MALICIOUS

PDF

78.3 KB Created: 2021-08-24 15:20:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 19239a863891b4dd00790fc666d420df SHA-1: a92315be7fd98039b899612c259ab9453aa8c0c9 SHA-256: ec43c3d9d74a2d1f4c040d5d671facfe2769f34ef42fb6992ff69281d3a544e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the overall structure strongly suggest a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://oniceh.ru/uplcv?utm_term=drawing+a+contemporary+approach+6th+edition+pdf PDF link annotation
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/e7d7f23ec698137d76f696b03c6f7e35/16714942947.pdfIn PDF document text
    • http://nprofit.hk/userfiles/237753094.pdfIn PDF document text
    • http://elm3rad.com/file/jezumozilemosamuwa.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/39676761883.pdfIn PDF document text
    • http://isystem.hu/userfiles/file/94391190390.pdfIn PDF document text
    • http://gdgom.com/upload/file/210623235225323094w5xrgkb0mm8c.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/1673488392.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/jaum6fq36qtu7o37cvps0g883n/58428433558.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160742f75a9fee---tatezugi.pdfIn PDF document text
    • http://dienmaybaongoc.com/ckfinder/userfiles/files/desalovuved.pdfIn PDF document text
    • https://birudongker.com/contents//files/52032713197.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/sifirovujuxigobojadow.pdfIn PDF document text
    • https://raljob.com/userfiles/file/83774755900.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/jepuwibidufaju.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/c5f7d6e9c031d89256d0a13430432c94/taxuxugujaruji.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/1640231754.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c63f028e687---kogisepewixobetepidawew.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16105734a24a26---94931251641.pdfIn PDF document text
    • https://jagominum.com/contents//files/pedepubapowasuvimumu.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/fewavitafiduj.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/41f5bad9b36c8f2184e2e4ec4c048e8d/96362917434.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eba8f572ea---56265338756.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/37548236824.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/55503751923.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_off0000cc4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4F 11224 bytes
SHA-256: 4c0069861f537d846e3046082a82762dbe9574fec04e25e365df6bfa98321392
font_01_sfnt_off0000e64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64A 17272 bytes
SHA-256: 70f84096921d5d155789cded5527e50b7004687055485b9f595aea691df9fa7c
font_02_sfnt_off000112b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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