Malicious PDF — malware analysis report

Static analysis result for SHA-256 50dca86a9961708f…

MALICIOUS

PDF

145.9 KB Created: 2021-06-25 17:42:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2704dc992df8dc9e2ef40f8e193c3e0b SHA-1: 13fd4c8d0c47f5cd1f43fa85d43a8170a72433c5 SHA-256: 50dca86a9961708fb6983562667170d2af37588ab0377d80c357103ac066c784
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 it is used to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lead users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

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://crewmak.ru/uplcv?utm_term=manual+for+the+ways+of+coping+questionnaire
    • https://luyenthitoeic.info/userfiles/file/fewamubifakatupisebixeruv.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/it0taqmj22p4a8u353np3a69jo/69324057490.pdf
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/40hee78o61n7i7qde7vr8b7697/83024176920.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/609ad8bb637127c0d876b7c08daa569d/6139520959.pdf
    • http://df-foundry.net/d/files/salufemozidi.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c19335b2fc---88301666200.pdf
    • https://nikoljski.com/ckfinder/userfiles/files/57186690553.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a15cd5b6f24---gugalevidilegazibi.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/08e6800a4988bdfd214938309a13b9f3/71563249100.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f09f9a823---dipeweribusi.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8dfb8f90c---12521320776.pdf
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/3657c56eaf354f8dee6fef4246ba1d84/tewewupakujuvilokukotozus.pdf
    • http://ogbchurch.com/clients/880797/File/78212016975.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/2e2fe43a80e6d0015fbd6372b6e88018/zubufujise.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084e40a2ebe8---96045665094.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/klrhrauddfis8lkip7a0p2d3hs/fufinukado.pdf
    • http://challendor.com/fckeditor/upload/file/21629671053.pdf
    • http://sluchatka-shop.cz/files/upload/files/8182670378.pdf
    • https://m-isc.com/userfiles/file/40104058411.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160afa6b62a8aa---rekag.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e5994e55d---92933351118.pdf
    • http://vasvaripalmuzeum.hu/upload/file/60165683135.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2299eba03---gimufefevepo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001da7b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1DA7B 16792 bytes
font_01_sfnt_off0001f292.bin
cd5d6a70bb6742931fb97f8c6c59926fe1bcd907c8079a8a51151544180a55ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x1F292 11196 bytes
font_02_sfnt_off00020c7e.bin
1427732487aef5bb80862fe4e85110aadcc33c096da5758a7c6a64cbe206d15b
pdf-font-stream PDF embedded font (sfnt) at offset 0x20C7E 17236 bytes