Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c4e26782c71c989…

MALICIOUS

PDF

78.0 KB Created: 2021-09-18 06:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 460d44247ef1c939218bf7d59ddd43da SHA-1: 9b0c9e6c2958b693a1a3163e2287ab21122cddf1 SHA-256: 3c4e26782c71c989adb3ecbe068f0e1cf01f8f4363ef1f6aa47ffb55e6abb0e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=how+to+transfer+icloud+data+to+android+phone PDF link annotation
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/77707417271.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/6871182973.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/xubofedaligegatata.pdfIn PDF document text
    • http://natalieshuff.com/uploads/file/41521724034.pdfIn PDF document text
    • https://polnische-zaune.de/userfiles/file/vudakovaboxenebijure.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1614255926ac3c---53148072844.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d4fe15da9---kudabulawobejuvuxedos.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/90485974668.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/jatufobop.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/1310232084614305009dcf4.pdfIn PDF document text
    • http://goref.ru/files/file/famugexozu.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/nerirurivipi.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/31303843227.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/jotetuvumuxasexox.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/bemodiseveg.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/tebazuwagupajiten.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7a109496b---74953501259.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202109060045267992.pdfIn PDF document text
    • http://mikol-styl.cz/userfiles/file/bomalejibolawexigozexani.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/zopojososujiz.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/uhp0b4dnjbjl9aciv3nlndnann/jujujujufo.pdfIn PDF document text
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/vejaxosirebego.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/didake.pdfIn PDF document text
    • https://il-gusto.com/images/file/81244038649.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16142a76241df7---23940947310.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_off0000cb35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB35 17520 bytes
SHA-256: 1f159db933c30a5528ecb10130e59d5fc6a91cff1734e542237372c4e2c103b6
font_01_sfnt_off0000f8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DE 10892 bytes
SHA-256: bc3f7b75b04110131c28667486b544d4c0ec624c1763335659010e0f1aa0eae6

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