Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e5ca187fe8b0964…

MALICIOUS

PDF

85.7 KB Created: 2021-06-27 06:22:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1463dd5e6f717f1566602ce5968c0882 SHA-1: 7007609e5df6345c2a3cecd51f1ccd5d2bec9de8 SHA-256: 9e5ca187fe8b096425b20aa5c7bcf54a404ed1c271190928c42ecc3ac1d4fe40
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a vehicle for the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/48811b8e1ee063cf796316ec7cf9b0ff/44128057647.pdf
    • http://henri-ruch.ch/doc_pub/file/rovubutin.pdf
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/2261901971.pdf
    • https://businessservicesuk.com/userfiles/file/joxirelewuger.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/t0ethd67krfcke9i40ml2a19rr/zafopinize.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2a7302c4e---xofibadotaxib.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b787ddfe7---89060935821.pdf
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/725def4880f19dc6363703ae9e064063/gilekudixalod.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b859480bd---kiraduniv.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/5bd1829250aafc7251f59013edd96391/kuworodokidug.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/37a7eff4ea1f7e35986fe6830348f76c/45990670554.pdf
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/b458e508042c5a6d341caf507fd02efb/44182195037.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8f6ab9e9c---liruwum.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ff1129b44---932538085.pdf
    • http://americanewbie.com/userfiles/file/luvefu.pdf
    • http://domholidays.com/userfiles/file/suzefarilojenurobupufip.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897b1575899---jizekuxuwakegexitibe.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609eeb2bb96ca---27492419731.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804411d74e2---bifuzavokukipanelimefikup.pdf
    • http://autoset66.ru/admin/ckfinder/userfiles/files/wagatal.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/b13ba8f92945350cec2e8abb86b9b70d/suwenogezawoval.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/44e9af9999ad608548d6f27989a03518/63329781829.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/f00ccf00a0deff87a26cc42d413424d4/31671361941.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=a+muscle+fascicle+is+a
    • 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_off0000f14c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF14C 16792 bytes
font_01_sfnt_off0001095e.bin
4cf3038570bdc83bb098ba6a654a15bb3ff85ffc041c8991446c53715f55972e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1095E 16124 bytes
font_02_sfnt_off00013318.bin
2879137f1dd094caf0782d355a815c2b5d768cc5ab3e2e79e63ed3d33d549a0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13318 10156 bytes

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