Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1fa4983bc50aca9…

MALICIOUS

PDF

76.4 KB Created: 2021-10-02 00:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 31636e0ab061d305beb3b23d9f42853a SHA-1: f1404980e6a74869cc026294f2d33f6218b29b25 SHA-256: d1fa4983bc50aca96745b2fef67c26fb6243dd29f3e8d87384fd84ae4ab83f2e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to numerous disposable domains and compromised WordPress sites, likely intended to host phishing content or further malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the final destination and leverage potentially trusted domains. No scripts were extracted, but the overall structure suggests a phishing or credential harvesting campaign.

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://allytemp.ru/uplcv?utm_term=configuracion+correo+cantv+android PDF link annotation
    • http://veganogle.es/uploads/ckfinder/files/65757781407.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/9d3eafa2a8b5138a1cb09a503a04688f/87297816890.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/vezokelesonigotusizeresig.pdfIn PDF document text
    • https://zoldlaptop.hu/ckfinder/userfiles/files/pamazatelujutobefosuba.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/zekowerofitefijorij.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/fenezadulafadokelawutuz.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/19708387592.pdfIn PDF document text
    • https://pspgenuine.com/ci/userfiles/files/32651119851.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/daxitinapokosakex.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615383907e5b4---lubofavofeselir.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/muxozawovajif.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/6785267525.pdfIn PDF document text
    • http://hibertek.com/image/files/20210906_111715.pdfIn PDF document text
    • http://midospa.com/upload/files/53893893493.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/sesikesajilazi.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/wajoridanunutufaxu.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210912193733.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/pekuboviniki.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/kefetolopitez.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/muwolimixugulu.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362bfc53ca2---ranewufepotemetupesatoda.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/90139472022.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/43848079167.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/vofinuj.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_off0000bf33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF33 20092 bytes
SHA-256: 3ba5804bcebfaa98518f7d9a8841a233d96cea9579aac65d701f33c0a7d78ba8
font_01_sfnt_off0000f31c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31C 10636 bytes
SHA-256: 2694921e780f9622b05f98dd32216218e9836441ac23fee13c5af4b890e88495
font_02_sfnt_off00010b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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