Malicious PDF — malware analysis report

Static analysis result for SHA-256 fadd28d8f0171570…

MALICIOUS

PDF

81.2 KB Created: 2021-08-15 09:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3dd937ebe17f22028630b1f9859b41ee SHA-1: 2999a5461b1c8748e85e404690310ef4edff71f2 SHA-256: fadd28d8f01715701c45788d1f9b0b284f39b40ab4b88c26079fb43501f8f257
156 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, likely intended to lure users to phishing sites or download further malware. The presence of external URIs and link farm heuristics strongly suggests a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=sharps+flats+and+naturals+half+steps+and+whole+steps+worksheet+answers PDF link annotation
    • http://vankouwenenmastop.nl/UserFiles/file/zojem.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/jpp5pnefjigol9m118ekf659f4/kojowekidaxibapuzo.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/duzavimutovimafow.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/55865865413.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/6a2a22ca9a60c6951822046b6cf61423/sozesalor.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ej20kjqjeq4dje1k40fsc8amur/ziwoz.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8ba5a2d4f---vavuzipasif.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/a04ab3aedcbcaf258e22cb1214ccb0fd/kavuzevojemikoforekavidu.pdfIn PDF document text
    • https://triyoga-tv.ru/userfiles/file/jowupekovurezoredax.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/leau5btftv5hpg7fru5ku2vra4/79677300089.pdfIn PDF document text
    • http://mileschapelcme.org/clients/9/9b/9b85db73e8c1d5ae3bc18b6db4f26039/File/65794135132.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/5162970866.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/11821633511.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c6da8b9ee---10170685620.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/janoxituk.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/39694170847.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/nixabajuxujok.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090ab8d8b71a---88537062623.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/45565265570.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/getiwuxutedam.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077a68f7dd63---37764904189.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160833b9eb4fb1---43302835847.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/zizezosidekix.pdfIn PDF document text
    • https://csodamalom.hu/files/files/2837348994.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_off0000da97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA97 16700 bytes
SHA-256: 2c3a6a28501ef1a28ec1180778f36a4dd1414f70800cd2d8d5959f185e99597b
font_01_sfnt_off000105cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011de6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE6 10856 bytes
SHA-256: af6c6dd456dd3a492f1897dc36cf6ba7b6326b475c36ebd9bdf56cdfe259fa46

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