Malicious PDF — malware analysis report

Static analysis result for SHA-256 df97fa18cfe0df8c…

MALICIOUS

PDF

96.1 KB Created: 2021-06-24 08:18:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 994caa7e88f886878948e547bcf2a7ba SHA-1: 74fdf7bd36685d597efb45b53f861673c7925713 SHA-256: df97fa18cfe0df8c95d6ba0e547aabc5539feb92587c0480c37d9df3e4cbc9fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript 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 hosted on compromised CMS platforms, suggesting it's part of a link farm designed to distribute malware or lead to phishing pages. The document body, though heavily obfuscated, appears to be a lure related to UPSC exam papers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://synerhu.ru/uplcv?utm_term=upsc+mains+previous+year+question+papers+with+answers PDF link annotation
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/620f916de4b5a151654418ee191b1f5f/ravodidiwelipinadid.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/42101725514.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb7cbdbf72---gedilexujamuwewib.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/15731011274.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f3ff3ca90---zutewiropami.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/60589165228.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/f59a99aa15b914a562677eee8cf7e9d6/rukorawizitedebibovaze.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a41431ea469---wetekuwix.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/71744470495.pdfIn PDF document text
    • http://firegallery.ru/img/upload/39746527725.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099282ba649e---33518671357.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/minupudinesudugobawojiwon.pdfIn PDF document text
    • http://k1a.ru/images/files/file/nemojexivujadi.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/tolupopinajipiwemali.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/7769149931.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000136f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F0 5512 bytes
SHA-256: ca7324fb6c97f5cc9f9419ef0e637481b2893ade68c78cc59a19f89bb10f7643
font_01_sfnt_off0001499d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1499D 11768 bytes
SHA-256: 99ebc7dea77e5bf81aebcaeb5a2813cc4effc289affdfc8bf631b5524d1de882

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