Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3bb915866d11a9d…

MALICIOUS

PDF

112.4 KB Created: 2021-06-28 17:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: fc4d7abaca22d8f6fd20d21418d7179e SHA-1: 786521dcaf7798db7a063a87f5dddbfa607646c9 SHA-256: d3bb915866d11a9d67011c79793ce46a4b33498741e84cc3435e7d7acd2e423a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9819

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 http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0f6c64c2f---84965292008.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b5c871b81---bixagifetopuzirekitoxolug.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/291d222ebe12bdae91aa6e30efebbfef/29725765307.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5984e8144---bowipiboxudeboforijimufa.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609661a9bebdc---11770392004.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857de2d5f88---27813499753.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e7a9caf20---sepajeberi.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/81827146249.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/f229c5837c258ced75223b831b780715/32347492522.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/sesilobal.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16092b8221319f---lazidamalabakaw.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/31785465320.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/vaio2m49vfo0i24ssp9rpq2bu2/72830280979.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/ac90ef55b328c8ed604015804ae2cd52/bivisilixavu.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/47116773593.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/cb16629f6ac02982bb65610fdf064db9/lesokulomul.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094c8386449d---jemilif.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/jimazajivanefebabanojower.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/zususojibitax.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd1aa789bf9---koxiforav.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff604961b6---vopegupomijuwinoj.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/bufigezabefowumizeganigem.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab91e627187---49368932288.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/sokosowu.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898d4c7644a---wutizerujerinewoxobufo.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160864f85ae455---vevilu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=what+is+the+monomer+of+a+nucleic+acid+calledPDF 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_off0001548f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1548F 17620 bytes
SHA-256: 823b06d6d5e7f19ab8ac3a414f27ffc2cd428a70c4d013f1aeb5c5a034fad1d8
font_01_sfnt_off000182ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182BA 10836 bytes
SHA-256: f00830e1b8eb5cd5cf6f448404d432242260c274aff65bf1c33cf50d95b2d596
font_02_sfnt_off00019b92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1