Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8e59ada4c9b3587…

MALICIOUS

PDF

88.0 KB Created: 2021-07-30 17:34:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fa87fba2141208a1db91734e1e0a2283 SHA-1: 1f3b90834f98d455964cfd37f35a941cf05e2ccc SHA-256: b8e59ada4c9b3587e36a71052b4b03453c49b6ed94bf94648d33d1e35e20eed2
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure itself appears to be a link farm rather than containing readable content, further supporting its role as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://tantex.org/tantex/tantexuserfiles/file/fewufuzogepuvofosokirulug.pdf In PDF document text
    • https://amd-export.com/site/upload/file/buzedixesizufux.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9aba82492---bulitowupigibuletedeseda.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/a2ec9ba5f3c2e8fd675140e91a7a44f2/furanomiguwasower.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/d869c211a4f4971586af46de00b56878/lasobemusapap.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/78c43635696d730f101fdc441c63d683/51397584510.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/98e1cc4930f6d9b4ab26622312107143/77421037603.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/68886619897.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16087c642bb5bb---dinaxozozupilomorimakonid.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/ef8e8079ce0bc3e42440336147155541/wutitedikawazega.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd3f04e13a---beririkimakaginefize.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/bofajuf.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-4-30/20210430175024184207.pdfIn PDF document text
    • https://giovannicaputoboutique.com/file/61259178482.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/rilugegofezumoxepodarep.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/93094491226.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/85364757640.pdfIn PDF document text
    • http://scro.ru/pic/file/wiraredejurebonaj.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/hh33a4hn53mgbgnns8h5eum4fh/93835057017.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d29d0e102f---15225237759.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/8766784481.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22076bd622---nutupibitasi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+install+wiring+mess+in+my+summer+carPDF 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_off0000f501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF501 10864 bytes
SHA-256: af16c297920f2f1d51a642fe4168d33d085fbaf9c901d32a2ecea26cba214a85
font_01_sfnt_off00010e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E26 16588 bytes
SHA-256: 15a6b23afeeab0a6c647fba45a2af751c8497d16058efaff5dc19d997331977d
font_02_sfnt_off00013946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13946 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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