Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0cdf1828e5b8710…

MALICIOUS

PDF

92.1 KB Created: 2021-09-22 12:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0212448703fa65c5f1f3ef20f403aef7 SHA-1: 7da54764823967c5b1b629f53c2650df9a135104 SHA-256: f0cdf1828e5b8710629f3f7eaa3fce5c6d2aba7a41c3fdf54fc4360dc958b2aa
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading a password-protected archive. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic strongly suggests this tactic. ClamAV detection and ML classification confirm the malicious nature of the file. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://crysiq.ru/uplcv?utm_term=el+amante+liberal+pdf PDF link annotation
    • https://mtydizayn.com/userfiles/file/46645640956.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/nijazajanerebumuv.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/bijudapozekemogegenoxigos.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f802590cf7---43439710556.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/2117166985.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/josifatelezapa.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/33211320860.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/1a4b3c7dd6e3a6daf8e1cbc37c3948de/36374457161.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/59359471730.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/5fc1c48d5e7f39e6776a88736ba45fbf/2698942650.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/gotekil.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/28469039291.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/61866802268.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/leludidikubeb.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138100862d09---naginekigejeposikubalawu.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/92595477388.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/98099684902.pdfIn PDF document text
    • https://loppisidjupdalen.se/images/uploaded/file/lirumojozura.pdfIn PDF document text
    • https://tcremich.lu/files/files/raxafomazubemajiwapibag.pdfIn PDF document text
    • http://safetruck.gr/images/file/kinakevupadufof.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/kududewesarazoxunimarudin.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/3b02b52675c235689fdf2e13cbcce758/duwedokizokarofuwalo.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb8ce17254---xanexobujoradibikupufe.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/gawagidusijejivuxo.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_off0000ffdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDF 10492 bytes
SHA-256: 9456ca68ff18ae1c323e51f44d4a25bc2d5990271ca065e264dda14cbd265448
font_01_sfnt_off0001175d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175D 19544 bytes
SHA-256: 0c1625399054872bfee942bccfa2949e76eb8c4a2ebd098d62081fa43ea0b506
font_02_sfnt_off0001497d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1497D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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