Malicious PDF — malware analysis report

Static analysis result for SHA-256 f54140ed3402aada…

MALICIOUS

PDF

72.5 KB Created: 2021-08-30 03:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3a0d36246e19d2fd7417bda446a82881 SHA-1: a8776adfc57223144c8d95226e859207fe1de950 SHA-256: f54140ed3402aada8d1558ae43603895b300c28d97b5c6817b5130377b685a66
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to compromised websites or sites hosted on disposable infrastructure, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and URL patterns are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://didaconcept.com/admin/fckeditor/file/41994271054.pdf In PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/72974696168.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612a05bd40ff8---27540996341.pdfIn PDF document text
    • http://szwygs.com/upload/73356075249.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/ecf97b96c4b02472ad74a261bf922689/gikunoparuvifagapexurepez.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/60t5cbsv13db4b73pqfa1nq5c5/65494466450.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/47677107952.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/9kip0thjro2v4cduaughf6dra0/bakexowipupeguvelibe.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/8db1a39bf178a6fb9de3f9002de0d409/xinefibug.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160823c9e3b860---97243103698.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f083699d0aa---71213158135.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/jowig.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/ravalubufuvuvuxuki.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/7991e648b8d8d93825450e39acdbaa40/54491411443.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/b4c0dcfed8c6607663643faa85c1eef6/30351793367.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/47391932871.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef4b565e9d---xixisurulejuvefifut.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/wafesezutasomodixob.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160b188f6ddc75---banuwotativupumoxevoxenev.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/74749385515.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/800da4e3f1d05828045a7bcd3767c6d9/30612479531.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=formula+for+tension+in+circular+motionPDF link annotation
    • 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_off0000ba1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA1C 10576 bytes
SHA-256: e024f4061ee5ee75588cd128d121dd9af44e03f4e34b0d894f5f427a1adea457
font_01_sfnt_off0000d23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23A 16440 bytes
SHA-256: 352fc06d6b55f00b07ef7a8904c41adb6fdd8eed96bc006a974c7b00dde591ba
font_02_sfnt_off0000fcbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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