Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b759c9ca7eeb6c9…

MALICIOUS

PDF

92.5 KB Created: 2021-09-01 05:59:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9a639efe4dca300ba4c4475467398b3f SHA-1: 917bcd4c2bfc4b8aa4e9b38154e285fb8362bc6e SHA-256: 6b759c9ca7eeb6c9349d793c5cfdc3ceb327116e733e53405de260739870af36
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a link farm or phishing lure. The primary attack pattern involves directing users to potentially malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://huntic.ru/uplcv?utm_term=worksheets+on+nouns+pronouns+and+adjectives PDF link annotation
    • https://lesartsdansmonjardin.com/userfiles/file/20210807212317.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/fdfic0ps16l3ibjh92rvek0hi5/741070867.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19243607814.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/pababilo.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a9b36e60a---xurezexedoju.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/juroneb.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/xumut.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4df26e3e5---kigoxodak.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/en2de5c01a71kqj8gmkdvhvn0j/pasitis.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddb226e59b---gawisipuronofonagoxe.pdfIn PDF document text
    • http://yuhongzg.com/d/files/76585322198.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/rikadanup.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///34025679340.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/vamurigifinagok.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/29799406298.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf90e82c31b---welon.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/a591b155f4c15bb6c8ec3f22d743e856/zosugufojet.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160790f97798a2---xuwiferiwosifoxubobiba.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/57995567224.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b904f6ebf4---vetumobepofi.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/36586313181.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a383cf798a4---38316309511.pdfIn PDF document text
    • https://groupburuemas2.com/contents//files/wejaj.pdfIn PDF document text
    • http://takeacode.com/user/d41d8cd98f00b204e9800998ecf8427e/file/15067179493.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_off000104c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C6 17576 bytes
SHA-256: ad4d17c50f2d6aca84b82df9c71e97c050b6c92d0d3f65156a7e7847031c2f14
font_01_sfnt_off000131f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A0E 10944 bytes
SHA-256: 6685e727852696135a15008bdc180ea6f6465c39c55528a397f80ba06150ddc7

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