Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca83e4aa1afd008d…

MALICIOUS

PDF

116.3 KB Created: 2021-07-20 22:37:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 66f1422bf743a1cb07003f67c862ba3f SHA-1: 8b9d59ff79050ac61f0ae8aa03f23144a7adad6f SHA-256: ca83e4aa1afd008d828e8164b128bbe05f11756269a9d5cdb37ba2a00f6f9dc2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to domains that appear to be compromised or disposable, suggesting a link farm designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such domains for distribution. While no scripts were explicitly extracted, the nature of the embedded URLs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://nelly-design.ru/upload/files/23028088874.pdf In PDF document text
    • http://m2m2design.com/userfiles/59808238431.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/66662801639.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160870c81257c2---mitupaj.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16078d43589ee1---541628224.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d8bac634e---88887171714.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/e89ff0cc7b6f6458a230d22284c5b3f6/5162490371.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160abc7290c9ca---67874240397.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/7119178b3bfc00d318354d8530b0c92c/72448012427.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/fegafatumedojegiwomew.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/54627748902.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0726b18567---35477211697.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/vuritezetenibawogukuxala.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/rezewiwosumatemowedutim.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d705039819---xifebuterixuju.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab038079ea---dapepajejuri.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/gijorifolugawi.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/paforunuvapuwujozixaxaze.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e90e87f091b---pugimozigovomo.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/1s4b0sdcisnvdn9gqdqd0rqge9/pofugupolisajixarag.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/edtc3h080b64csfih8bmchetv7/16104458756.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210604025430.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/83935537983.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c94a4fa1f7a---3008862809.pdfIn PDF document text
    • http://cityhighclassof77.com/clients/9/9e/9ea685038b5a197d2022a69b8c6b162a/File/laxiwojukidelu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=question+answer+of+globalisation+and+the+indian+economyPDF 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_off00016477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16477 11424 bytes
SHA-256: 168e20517c71fd27abd0a614a782413e0e6810c6208178a69321e1c86134692f
font_01_sfnt_off00017f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F3B 16884 bytes
SHA-256: dc069deb251012ff4d5b5a6aae0244fa8a6fb8fe7427487eb343c863ccb4fac5
font_02_sfnt_off0001ab47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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