Malicious PDF — malware analysis report

Static analysis result for SHA-256 396a6d846467adb8…

MALICIOUS

PDF

84.7 KB Created: 2021-09-03 05:05:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dfd3b15276dfaab40c67b4f55d74ee6e SHA-1: 755b9961e7ca7f7c733dfb501f0cf98817503e8a SHA-256: 396a6d846467adb809e2d289ee3eb905108cb89b5c6a8e0a85841560ca24e545
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam context, further supported by the ML classifier and ClamAV detection. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents that may leverage embedded JavaScript for redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=livro+budismo+psicologia+do+autoconhecimento+pdf PDF link annotation
    • http://ceroki.com/image/files/56731105628.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/gilirakijenavudazetija.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3f20cdb4d---dijudutodirizikuzana.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160747fdf7d87d---78229072372.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/davidafupegabudowazo.pdfIn PDF document text
    • http://www.siposferenc.hu/html/vidikubukojelubig.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d2f67bc735c---lenupaxidumabozuzix.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/feramabexipikezufut.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16102b1301c045---gexaroribapibenunakuda.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d41cd8f9d---4911737451.pdfIn PDF document text
    • http://siembra.me/uploads/files/74902285655.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/b3a3bed61da749f0952c33831a04363d/55179012877.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083cdbf794af---jakewosa.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd547f3c5e---fuborezamopidafikelabu.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16114a1365c8bd---33588518577.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/94331142917.pdfIn PDF document text
    • https://frontlinetherapist.com/wp-content/plugins/super-forms/uploads/php/files/347424c0bdafb9ed7c30c134280eefa9/2480265477.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/62453053758.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/41676140065.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/wamire.pdfIn PDF document text
    • https://baongochoa.com/upload/file/vadolubamugububa.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b836df141b0---zosabinew.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/porl3nb1a772s0r17qvkvi8ob7/luvisabeg.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/nikiwowadubi.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/kabuwadawovevi.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_off0000dd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6D 20564 bytes
SHA-256: f82eefafa849df4b299b6acdd7daeaeb1070af2f3f841c0aee0db927b0dfcf84
font_01_sfnt_off00011055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11055 11332 bytes
SHA-256: d2c42d9144a0f53eb2707e316a03f52002418c008de3c6e8118a1dd4e91748c1
font_02_sfnt_off00012a63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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