Malicious PDF — malware analysis report

Static analysis result for SHA-256 48524347c40db998…

MALICIOUS

PDF

89.5 KB Created: 2021-09-08 01:23:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 591fbd631678d9c7c566374f42d6a6a4 SHA-1: ae6fd5696d883d11d14819f6b0f222c7904f067f SHA-256: 48524347c40db998dd2e99008ad4c3b211e39297bcfa9d60dad9cf290b385e49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate the document's primary purpose is to drive traffic to potentially malicious external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://inwebjor.ru/uplcv?utm_term=summary+writing+exercises+for+high+school+students+pdf PDF link annotation
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/d81d543834c13d5a3ca62d97d453fd05/9825673960.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/24269841645.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/57325355373.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d50c1926b1e---zadupekusuz.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210820_123549.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160982b393309c---jororitojetelogi.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/30616862587.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/41622869136.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a5de080d53b---5710168214.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ed8eb41805f---wufunaxika.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/9673f43095c5637851b623e7b8e26abd/vidabukukokevifuxaviwuxo.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/55886133988.pdfIn PDF document text
    • http://cmtsport.com/pliki/68077449730.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/10936794463.pdfIn PDF document text
    • http://compsult.net/userfiles/file/66461317735.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/dcd7ca2944000194f8fe7f7862f8d089/88230254783.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/70527744907.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/nenaziduranolasuvenu.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a953e6596---84580257555.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/cfa8629f086a7e5a7409bbc14722df11/sobaledetarolifojodun.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/87644567368.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/30661201407.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/zurudomipumubovunixa.pdfIn PDF document text
    • http://phs1961.com/clients/2/29/29da8dc1278d8f1c58a3d16208bcb4e7/File/59011260287.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8687470038---bosizajemebanovuromojeta.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_off0000f509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF509 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D20 11544 bytes
SHA-256: 6ecc15fb87bb27aa05f6285a156365ef091e3cd002edb2b39fbad95c4e29057d
font_02_sfnt_off00012826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12826 18464 bytes
SHA-256: feb2c32dbbd098cbb55ca0608ae88335d122dbb67b3f0a2934095c44cf51856e

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