Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7949b881dec57bc…

MALICIOUS

PDF

100.7 KB Created: 2021-06-20 14:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 6a683ff090d6ed94d2cb1ca76050c870 SHA-1: e8fdd668db5186a6cebf155a165ecc67d0b99d5c SHA-256: a7949b881dec57bcb0b2968e9ed62442fff5ad4eb6abdf2aec3d4bb035fd7d2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The heuristic firings indicate this PDF is part of a link farm designed to deceive users searching for specific content, such as 'tokyo ghoul manga pdf download english'. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://philabc.ru/uplcv?utm_term=tokyo+ghoul+manga+pdf+download+english PDF link annotation
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/41fb50cb5cd640f2f9417f190e72c374/bibixisejiwatamevi.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/71341580705.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/eb5ebc0qc301m5chc07fsjb4q3/28410195493.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/medebud.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160794c4556f83---4875973190.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077b2dd4180e---satabugesaxikuriv.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/19eb2f897f15a2856a379c45e8ef39a9/lopetizex.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210522010640.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32a4247526---bimosetevejinet.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/gikuvonidetigabowa.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607b554d8f437---3700996848.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb18de2d41---tewirojilatazeganigoki.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/23175266492.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000ffc4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFFC4 22948 bytes
SHA-256: f73726023a35cd2dde888e41e67d22d9ee62630ee629f9df7ac0e57af370aee0
font_01_sfnt_off000148ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148EE 5568 bytes
SHA-256: ac1a07432f921fa1f9e9687763f0113c46aed75cf26ac5d3cb98656e56054ca4
font_02_sfnt_off00015bd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BD9 12100 bytes
SHA-256: 3f345a32698f8d2300b3ba17779dd7a6708501840730ecf6130a8dfe9275bd09

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