Malicious PDF — malware analysis report

Static analysis result for SHA-256 93b6e2467705ea38…

MALICIOUS

PDF

77.1 KB Created: 2021-09-05 08:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 42b917e590b5cabcd2c04f84f2ddbaf5 SHA-1: ea583f409936198cfec0aa6608f0d1168e5e6408 SHA-256: 93b6e2467705ea383e7319b5727e18e53ccaa62eef55ba376d905a1cd39cc26c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware delivery attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=mensuration+square+questions+pdf PDF link annotation
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/7d312acaeb359732998e007d6e29d3f7/75979666076.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/91910944174.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/24839899559.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/benaf.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/reroxemujapew.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/91606314629.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/mokimilonulupef.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1606feaa08ad54---vinaxesuduzibabozusubakeg.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/96425117215.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210817025957875.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/e1707e61492d41a508d2d203861dd0e3/duginizototol.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a40b58c9b---dagitigaruvujap.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/xerumide.pdfIn PDF document text
    • http://slpclassof67.com/clients/45391/File/dijif.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/silidemuxaruxeris.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/2407009168.pdfIn PDF document text
    • https://mobilityservices.it/file/suwazorumezi.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/86527605062.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/59786789077.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/69858188790.pdfIn PDF document text
    • https://adium.ru/userfiles/file/wepalejuwunutazibe.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///supevesonuve.pdfIn PDF document text
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/41419840173.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/66744016595.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_off0000c7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e00d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00D 17684 bytes
SHA-256: 866958766e2ffa26777a59a6aa7468418e5e2c197f63cd59c77f26c9f0f05f69
font_02_sfnt_off00010e1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1C 10684 bytes
SHA-256: 3b76608904421f8c11b8f5d5e9a6f6222c9ae5487c949c90f530f6b2e829a919

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