Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f8bdaac218b3f36…

MALICIOUS

PDF

86.4 KB Created: 2021-09-08 01:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1ccbe7f742697f7525ef885f2fbbf3f5 SHA-1: 371c44a9dd4199a53734c9fc0e2b834c016d700b SHA-256: 5f8bdaac218b3f36ce248a3e4d1034f1ed21c5ab6e8cf879c91b3a3ce4d65c96
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and a callback phishing lure, directing users to potentially compromised WordPress sites and external URLs. No scripts were extracted, but the PDF structure and embedded URLs suggest an attempt to trick users into contacting malicious actors under the guise of support or billing issues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://coretry.ru/uplcv?utm_term=gym+workout+exercise+chart+pdf PDF link annotation
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160901c14ce3ac---99189066604.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ee01614c785---58453759077.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16082033f7b4eb---wudedibud.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/lorosawi.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd4a78cc72---piguziku.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/damazetebe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6feff0f2f---41058596075.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54f7c574e5---25436970989.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/zokenaxo.pdfIn PDF document text
    • https://senhewood.com/d/files/mejaxomakubajapupezu.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/94263768581.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/6428599933.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/920e3bb2b7fee948963c0f30f772f067/vukatevuvogupekar.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607452a766927---musetekadiferotumam.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/pajevuloxaroxedud.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/dodalejexikanak.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/bekavexabulewadubi.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc347f40d8---74391240083.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714e37ac60a---laworevigusijoki.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/mibofixivesu.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/tadisujitapofagisi.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b01a18b0c---65527656988.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/12381975892.pdfIn PDF document text
    • https://begili.com/uploads/image/files/gufipidekos.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f5f36e0f82f---70113421280.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_off0000ea2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2F 11268 bytes
SHA-256: 29ab8c5b9dd5e48475159ac17fde7fc86ef5da7e4bf156e103feaf3dc51b2d6f
font_01_sfnt_off000104ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CE 18052 bytes
SHA-256: 75397ba250ef72013373c7caa068e474d31a7a0c07579bd50e69e099ff29a7b8
font_02_sfnt_off00013394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13394 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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