Malicious PDF — malware analysis report

Static analysis result for SHA-256 4992b5ba20baa000…

MALICIOUS

PDF

83.3 KB Created: 2021-09-22 17:48:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d43b71328ad8a280d47d78b8f31e1a68 SHA-1: fedfc28e2085ea7719e51d0ad82f12bb6f56fa51 SHA-256: 4992b5ba20baa0006c4b39ce18b831930e32906f9dbef0337dd3067c5e33d435
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to various PDF files, some hosted on compromised CMS upload storage. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, consistent with callback phishing or tech-support scams. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oklogistic.lv/upload/file/71836687611.pdf In PDF document text
    • http://qazaqbanki.kz/data/content/files/19513788089.pdfIn PDF document text
    • http://isystem.hu/userfiles/file/telizirilerubenemedapiw.pdfIn PDF document text
    • http://iwort.de/userfiles/file/74123374048.pdfIn PDF document text
    • https://digireg.si/upload/66522750798.pdfIn PDF document text
    • http://lagunarent.lt/ckfinder/userfiles/files/didisixosunizulokezaf.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16134ebbf42c68---71713144282.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/86751988040.pdfIn PDF document text
    • http://veszpremkosar.hu/_user/file/51282667784.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/patosefesokan.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/86i6ve5c87m66dpofi695drq26/2394372669.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/87406742478.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/83575899415.pdfIn PDF document text
    • https://isosklo.cz/uploads/71120632630.pdfIn PDF document text
    • http://rfychina.com/upfiles/files/16321924565386.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/52493558086.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613199ff64cec---nadivekiso.pdfIn PDF document text
    • http://wwstationery.com/files/file/71722242510.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/zazadiwisivuvofosoj.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/pbrku49ds4g8fg1v08esfqmth0/totipa.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109160552021822.pdfIn PDF document text
    • https://lederstuhl-shop.de/ckfinder/userfiles/files/nojibidogubibonumobiba.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/40890530324.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+do+you+turn+off+android+phonePDF 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_off0000dfff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF811 18128 bytes
SHA-256: b1c27e300aa768f45ee8f4f3d5f0725ccacc07ee881dd4d3da0be10435bb9ba5
font_02_sfnt_off00012779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12779 10672 bytes
SHA-256: 6cfdd9d2d4b0afd0b447aed235d0c95cb5966b787a2f071bf59ddaa8a3cb1e8d

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