Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f39916795e0dcf…

MALICIOUS

PDF

99.5 KB Created: 2021-09-07 09:10:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4b724b3921cf98dbbee8adf914b0c98e SHA-1: ba41448313729731f60189fa42ec53c90e650a32 SHA-256: 85f39916795e0dcfdac670659d8bbcc659026979bb22727108d4df05e3f26804
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm or phishing lure. The primary attack pattern involves directing users to external URLs, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://queure.ru/uplcv?utm_term=cesar+roberto+bitencourt+direito+penal+pdf PDF link annotation
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/49d0n0onqbmt2chfn5cglk4ab1/27896314320.pdfIn PDF document text
    • http://pacemakerpressintl.com/uploads/assets/file/pazifazozota.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7eb669198e6ef26a7e11dc536ddc524a/gifopug.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/gibupozoful.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/89446433989.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/oxanefaf.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608da5f1bfcf6---kabimifo.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/83591399791.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/7147693805.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/55309697056.pdfIn PDF document text
    • http://yorktownhs1987.com/clients/57482/File/22754254793.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/vosadexexuderu.pdfIn PDF document text
    • http://kinogigant.com/sadm_files/77373576062.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081084512e9f---mugomu.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3aca7e8cf9---danetawikigaxibudow.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/8cb741b8c4f9f4b6e82e59786ff5d668/vabibezunawe.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/jinbjt70k9rt1h2d8uot8rnkdf/16183680227.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/5103bb5bf841480e2fe88d1391717bd4/70334907176.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/dc5f5b52ff7f867f1670abe6b1798074/fubuwabimativof.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/9797222883.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/15051545902.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/62255621472.pdfIn PDF document text
    • http://covinahigh1980.com/clients/1/14/147ee80f0cf2e08ca1b5067d21485a43/File/xulepijefopodejaloda.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_off000119c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C3 10884 bytes
SHA-256: a14e9d9b3b580972fd9d7d317a8fd96ee5bbf1f21c325da9612c5cfdc37ecc4f
font_01_sfnt_off000132d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014aea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AEA 20264 bytes
SHA-256: a73b45854dd6447ccddd1130fb126636a22aec5afc84c883c52e3aa56b5814e8

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