Malicious PDF — malware analysis report

Static analysis result for SHA-256 458e697e806f4467…

MALICIOUS

PDF

84.9 KB Created: 2021-09-15 07:30:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7854a9506fa47ddf7308df47509e8460 SHA-1: 5086fa05c9e5e48e082e8efae1974d7f9e0eee10 SHA-256: 458e697e806f446703179afcc84ec89a2defd9523dba2090a2d00da56b4fc367
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised or disposable domains. These links are likely intended to redirect users to phishing sites or 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 http://nfc-lampang.com/user_img/files/tureloxo.pdf In PDF document text
    • https://ctapigroup3.com/contents/files/zaxiwixigezinasajese.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/92787211950.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/wesavujuxuse.pdfIn PDF document text
    • http://p-energo.ru/content/file/17528251432.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/79896194027.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/sutedusuvimuki.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/lafowufiguxenedezopa.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/xitupojalenebulob.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/zikewofozejuvexafofum.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/61979178463.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/01f4ea01f15c8d4142575e81e2c07e0a/84096010141.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/tutawusekiniletulu.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411d512cb1a---nufilowuzusenubitox.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/69787794600.pdfIn PDF document text
    • http://www.slappedtogether.com/editoruploadfiles/file/11163262450.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/1679668476.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614138cb737e2---retetogibegusozadabotinax.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/vujapabakuv.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/sanemetevurowisi.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/36945940216.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/cd8c583522629b6bb2492f101f19b8af/40648942003.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/68560364803.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/logumokitefux.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/32559543099.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=probability+of+independent+events+worksheetPDF 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_off0000e339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE339 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4B 18528 bytes
SHA-256: 4cb25be3bfabbe35eddf1374c96bf938a16d2fa34c423306fdcc5d2c1d68d5d7
font_02_sfnt_off00012b92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B92 11092 bytes
SHA-256: 1b40bcef60ed860e908f9f407a17aca3edc460d1c4106835e6ba72708a445618