Malicious PDF — malware analysis report

Static analysis result for SHA-256 41e11f449b48f963…

MALICIOUS

PDF

94.1 KB Created: 2021-09-23 06:25:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9b688b543e7131e300203a928cdc3ba7 SHA-1: 9f4eecf1855b39776eab23721cd4b895b9a455bf SHA-256: 41e11f449b48f96396eb8065cfc2cf574729bd70cab45d6587ee7372218df01b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple external URLs, including compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=fast+and+furious+full+movie+watch+online PDF link annotation
    • http://urbancollab.com/userfiles/Proj_Name/files/53629789603.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/jafov.pdfIn PDF document text
    • http://all-premium.com/user_file/files/23509326215.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/milatavexenejujiminosew.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135cef0eedce---sironavunoro.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/83147712593.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210914_B7FD46A6C4E71AE8.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613ebd7fc061f---soxilesolarivusegoboxove.pdfIn PDF document text
    • http://naviway.su/upload/files/11874146387.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/xalak.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///49391596499.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/kotaj.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/puburudumu.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/fedes.pdfIn PDF document text
    • http://lordwood.ru/images/file/70678452922.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/55510567986.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/17950386414.pdfIn PDF document text
    • http://ruihuitax.com/files/file/fisumirowinodomujuvowolo.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/8144122638.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/92652514777.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339ddc83b96---83337170725.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/27075242850.pdfIn PDF document text
    • https://trainova.com/userfiles/file/masulasawedopawe.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/js7577a9ep2ckk8m4l0rjnr2e6/gefoxusi.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_off000104ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EC 19928 bytes
SHA-256: c58cb5d43de2436b61b7877401834b6a2cbd9cb6953af1a628ce58641c0f9185
font_01_sfnt_off00013927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13927 10972 bytes
SHA-256: 9b07e231bbac2ee1defe4d6681889540c7f06f6270d33fc1a5a3cc97ec9167b2
font_02_sfnt_off00015277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15277 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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