Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8b25d8d16e756b7…

MALICIOUS

PDF

84.5 KB Created: 2021-06-30 00:26:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 82ed1c3dbeaf0df780ff9c0095af4a7a SHA-1: 48f681fcd0a62603d291c49e931019167919d233 SHA-256: c8b25d8d16e756b735e89821c083464504039dbd95d69d85fb18321fa608b9ed
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 and an ML classifier indicating a high probability of maliciousness. The file functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/b69jchcrbj9vjjr4p7d07vpm0j/24066993088.pdf In PDF document text
    • http://onishi-kyosendo.jp/archive/9855337338.pdfIn PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/89115007761.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/12519406304.pdfIn PDF document text
    • http://jp-cable.com/d/files/8602035656.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/79cdb1e909f8dd9683a747cd2edad324/migefamolepoza.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9428cf3cb---81524509835.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/595653b3548aa8058254938be0f11977/fejetewufukuvodefizupi.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/f4194cebdd9605d3526994460d8f8e58/42746335013.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/73880171499.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/ad21efd943b6ed1549a520dd277479cc/24679928895.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609a047dac9f8---52549550637.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/05650ae70a16b6b37a99b171128281e0/mamonezamazuzuluwegijuru.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/nugenovi.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/08v4sh253tn11skcm7mgo5cc2g/dexanapijefirunen.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/nerupajob.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098052c7fd31---musoxaduvabowewodaku.pdfIn PDF document text
    • http://stroi-sistema.ru/img/puxadavoz.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/mirodowo.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5cd96685a---3803673022.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a82d25312---66318110941.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/sanujobuwikefaxolujivu.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5bb600b43---videnojeni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=apa+format+paper+abstractPDF 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_off0000e815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE815 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001002c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002C 10520 bytes
SHA-256: 9aff771fd0cc0f584af84fb614e7d669ee95091b7de939ad224e865252275fd8
font_02_sfnt_off000117ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FF 17524 bytes
SHA-256: 0ef7ed183f0fb9d0e673552dfbfa81e0966553035b92028487f91ffcbf07e71f

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