Malicious PDF — malware analysis report

Static analysis result for SHA-256 1667dcf90fdefc6e…

MALICIOUS

PDF

90.7 KB Created: 2021-07-06 20:21:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6b81d82ecafeb75cd79abe3ed63ed071 SHA-1: 72fb7e6bd3f08ab5106dc2654013c494640d6f52 SHA-256: 1667dcf90fdefc6ef6f48441d55e9025240891e320d2b4052c696653d10f9a34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm. ClamAV detected this as Pdf.Phishing.Trojan, and ML classification strongly suggests maliciousness. The document body is unreadable binary data, but the heuristics and URL analysis point to a phishing or SEO manipulation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/96d2636352b1c20c5f1b0f6fc0141e6d/riwadamojuzokedi.pdf
    • http://rjt1.org/upload/files/dajijugaranu.pdf
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/55646472908.pdf
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/gonarabokidipabanono.pdf
    • http://yangs-ns.com/ckfinder/userfiles/files/20210528145105.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/b9638f36ec900db9ebc2582f8e0a275e/96160273149.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b9558a18c---17781801325.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc0e24c7e90---dawofovovexumigidogupeka.pdf
    • http://aaaexpressac.com/userfiles/file/71288731279.pdf
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/13a515d41fcd83b5aabc85574cb142d9/duxasevotuwagadetize.pdf
    • http://garderoba.sk/images/_file/81527361317.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/i6d614jtnaeqs6hmt3tcn0pa8o/lobuvo.pdf
    • http://mazdooradda.com/userfiles/file/murag.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090d851ce836---59913715347.pdf
    • https://associazionedynamica.it/uploads/file/72373505709.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f295617f5---tuderabim.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/40f8901416a6933938033469a3c98495/57264651624.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/7bds0sf3q6v2d6m7mc47ecc253/36086009168.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/7a76909830f48b496358a0087dd20629/pekumabi.pdf
    • http://ekolojikweb.net/upld/userfiles/file/sezitovazutevogomobedoj.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16078fd9382cea---37556166075.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/f5f1d63df34bbe021a0ae131e1df60d1/balitudigunopopopa.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b6ddc1f2b---79553780031.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/17c3c2bfe1499b5b02643a89c6d5680e/xebebotunub.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5f962cc0d---66695417471.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+repair+a+enchanted+fishing+rod+in+minecraft
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc6d.bin
e304929f51bfda1d76726026a9b4a7e600a767412364cee875281ccd93b44cec
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6D 11096 bytes
font_01_sfnt_off000115eb.bin
3ba904fe671ee7e2a2345d58aaeb2186a0913ae26141052362efc4b9672b0672
pdf-font-stream PDF embedded font (sfnt) at offset 0x115EB 17892 bytes
font_02_sfnt_off000144f1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x144F1 16792 bytes