Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a114a8a523c8a56…

MALICIOUS

PDF

83.5 KB Created: 2021-09-11 21:48:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 652127dee0ebb26f8984c24065e634cd SHA-1: bac40ddadaa4a276afc3a4b237a7c12105b893ce SHA-256: 8a114a8a523c8a56204a36022b2ec036a586e1b25971c9b18d9fd417c6af621b
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. The PDF contains numerous embedded URLs, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious or phishing content. The `utm_term` parameter in some URLs indicates a potential phishing or scam lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://infrive.ru/uplcv?utm_term=in+the+house+2012+watch+online PDF link annotation
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613513ebe834a---27569430358.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/94305215877.pdfIn PDF document text
    • https://kueapem.com/contents/files/30024820850.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/95229676779.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/973a0a0b7b80b7ed0ae36e6e56841d8b/rotowabibirajofukuli.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/54302660934.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/sivaganasipuwas.pdfIn PDF document text
    • http://jaqalsports.com/files/file/22924600385.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/c5e0f459fc51517d4eff35748c317f1c/fugatiwimoxapagine.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/zosekukelurukuneb.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/binukavefowadixasawewado.pdfIn PDF document text
    • https://istanajp2.com/contents/files/fizileget.pdfIn PDF document text
    • https://onecre.com/images/content/files/57321080505.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/21211972366139dcf779828.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132727854870---puvobomip.pdfIn PDF document text
    • http://onlinevay.com/upload/files/xurapukex.pdfIn PDF document text
    • https://sainaudit.mn/File/10054111038.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/36418219289.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/60930881195.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/lokovusuwesetisebefes.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/61782861867.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/c8757fab862791ee70d25431995f9ecd/molij.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/fotagivivopuripiriz.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/69165882270.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613289fa1b3b3---xifemutabu.pdfIn PDF document text
    • https://lapdonline.org/file/25166517275.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_off0000e120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE120 18012 bytes
SHA-256: aee211c8c28aafeb1548964981f787b26d73495ad4add9e7a1e6c937ca20ee83
font_01_sfnt_off00010fa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BE 10660 bytes
SHA-256: f4ef420805e70c4e8e10a4c9db89245479816c79cf6dde9dd0d6f2d430cd39a0

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