Malicious PDF — malware analysis report

Static analysis result for SHA-256 f08db99ee902e28e…

MALICIOUS

PDF

84.9 KB Created: 2021-09-10 14:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 684ffda93c70082d43564193bc6dbe8b SHA-1: bcde3165fa67081043389b658a54735e8cbe4977 SHA-256: f08db99ee902e28e0a7c4ef3cc6c75ce6937d5225adaf597c06fcdabdddbe1c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious sites. While no scripts were directly extracted, the nature of the embedded links and the heuristic firings indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=redmi+note+8+2021+launch+date+in+india PDF link annotation
    • http://bonezi.morefriendship.com/upload/files/40194175200.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/83847979189.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/25171917970.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c7pv9gp056u1qj5stoclkbmvo2/gidojemixojetudidajanobov.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/xorop.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/degufifimivodibu.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/18696314062.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109091306039114.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/kopadujup.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/41051193134.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/silakaj.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/wuxadijetijubovipuj.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/rutixavububitudawova.pdfIn PDF document text
    • http://imdmotors.com/uploadfile/file/2021090314013934.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/tojilajes.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/mikepixidafefovikomiwo.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/32861724509.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/bikezebolexujekasuzarusaj.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/30648047993.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130322145dc0---21509168686.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/69217536188.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/271ab6b689f48357d0d834e5b67d3cfd/luvenofiseketanowunepa.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/zemugaxegutumaxu.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/susixogomonotiputolakaja.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_off0000dd5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF571 11012 bytes
SHA-256: df2448080d7c2bea2bc73324ee9f917de10d5412fd8fac2a4400f5f5a8185146
font_02_sfnt_off00010eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEB 21064 bytes
SHA-256: 0902aa4e040bee5427216949b806b9972b94261d8091508a90c640358bb56b14

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