Malicious PDF — malware analysis report

Static analysis result for SHA-256 4719015c6283de19…

MALICIOUS

PDF

84.1 KB Created: 2021-09-18 17:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 612d05b6d88a62ef5aec3ec68d710e4c SHA-1: d099f22ec3cea847fc2eca6f32cc72748cfb2a2b SHA-256: 4719015c6283de192e92db49f9c3ff86e9d2c1a8e518d63e204ad580c24016cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://inwebjor.ru/uplcv?utm_term=pokemon+white+cloud+download PDF link annotation
    • http://jfhconsultancy.nl/userfiles/files/62624230753.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144284eb351a---medumokumuvusefixade.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/zaritizokomevutiduxeju.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411114c8784---72782966803.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/nixumumezarixudakaxaxa.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/giwenisularujinelafela.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/sizifu.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/29443204284.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/fiwugewepefusemuliguneja.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/6974bc23a57d441780e2af567cf7b585/34720904276.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/25230823872.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021091419163672.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/nujuwus.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/79495862902.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/dosoluzipizumizuledep.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/36648272381.pdfIn PDF document text
    • https://akconta.com/uploads/files/wimabikemunedamopazo.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/suzoxab.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72854028340.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/nemelutajefebuxizepitidat.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/63086347552.pdfIn PDF document text
    • http://atem.sciara.eu/public/upload/file/79500189633.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_off0000dea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA4 19808 bytes
SHA-256: 8f795c2882b7fd242e3d84f59c670ef8227a510e04d960d0f0125f4d7b28cd0a
font_01_sfnt_off0001126a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126A 10644 bytes
SHA-256: dae48353f0546351efd1584ecaf3e540fb00b50dcf4204cfe5719f1266965cb6
font_02_sfnt_off00012aa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1