Malicious PDF — malware analysis report

Static analysis result for SHA-256 6818c4eec58b5590…

MALICIOUS

PDF

74.0 KB Created: 2021-09-15 21:03:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3c35bb4c52f9aded536f96e558e1afa1 SHA-1: e8ef407e811aaa127f850768d34e3954fc4a1ab2 SHA-256: 6818c4eec58b559051980792832a146ec73e27b9535448885eef4d44d956a8a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicative of a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest a phishing or malware distribution scheme. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://krisoc.ru/uplcv?utm_term=watch+hollywood+movies+online+for+free+full+movie+hd PDF link annotation
    • http://patrick-vallot.com/upload/files/naxebakike.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/genidasavudilulagisowo.pdfIn PDF document text
    • https://turkeyinsurance.info/images/file/zojeg.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/44597915200.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/gemalokujisegopetanenun.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/dugajaliwabujagoxod.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/72459942382.pdfIn PDF document text
    • http://synfarm.com/upload/files/38407301659.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/85615113571.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/161347970c924d---wofej.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/fovigomegimibizesarugedit.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/25af80cf60852ad118b5d931e579da8d/wowagelozefuwev.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/mafumub.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/ptc9t2b873djocm4v304gfqkf4/75074127123.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353ce85205f---23999909228.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/sv8tc7l4libg0djt6r7145aend/xerupobenodotovuji.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/tolefeveferuretoxiz.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/fewaxaxomi.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/wigoru.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/40134215061.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/6f35c75e35bfa6ba2043142dd9a0f8d1/13888927621.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/lajanududef.pdfIn PDF document text
    • https://claudiodituri.it/uploads/zozuxifosulaj.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_off0000bb9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B1 11100 bytes
SHA-256: f6f4957ee345bb2ca083278f544761795f55a61347d15d0a0ebb1dc07f4faf1c
font_02_sfnt_off0000ed7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7C 17300 bytes
SHA-256: 52ac9ed363ac13dba9210e2ddbcbbbd374f405907d41407adb6897173ad38230

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