Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ad8bc0fc46f3d80…

MALICIOUS

PDF

85.5 KB Created: 2021-07-08 06:24:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 533465bcad3492b59d1efde8752eac0c SHA-1: 4cab085b8329cd9d9a83f7ac7b08b1bf27a6092c SHA-256: 1ad8bc0fc46f3d804fcd463c2ecb42ed0dac984748a9f2610a775dff86373dc8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files. This pattern suggests a link farm designed to obscure the ultimate destination and potentially distribute phishing content or malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d43323385---96984173713.pdf In PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/lefekadagagugelexabude.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/judijipa.pdfIn PDF document text
    • http://temple.mo/userfiles/file/77449987251.pdfIn PDF document text
    • http://ligonfamilyreunion.org/clients/9/9a/9a44987365eba454cd9b2deda39aa7c0/File/lekod.pdfIn PDF document text
    • http://oinworkshop.com/clients/6/6d/6d9161a7191ba42f41383a85782e2f4f/File/15344161513.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/razozevopifar.pdfIn PDF document text
    • http://christopherdallo.com/file/53343946954.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607638c9cd4d8---43452304575.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/migapimabopelovinoxem.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/nodobogulajukovozuvi.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/23457663976.pdfIn PDF document text
    • http://funperm.ru/content/file/kafovelasugewoviz.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/pixadebegulodageto.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d276828958---kuxalirud.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fe5020eb7---pixofexixi.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/32bd4c4523ad49ca1d98afe64a372645/xotegixupewenome.pdfIn PDF document text
    • http://bendhorseride.com/userfiles/file/79570417977.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/3012889e6662cbc31f0a85c5203b02d3/solewake.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/7ed9791434132396e63ffcbbda0b365e/60262946550.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/pazoluzaj.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/79917735033.pdfIn PDF document text
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/nixivosuzujulipu.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4d0b66f03---49416743638.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc94e60927---ditekivefo.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16087558ecd6a4---damoxezuzominuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+defrost+bread+fastPDF 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_off0000eec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DF 10320 bytes
SHA-256: a4c98e4fc860403e9bbf0642878f4c526646b1dab9f9aeed72e05ff6ef3e86c7
font_02_sfnt_off00011e4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4E 16492 bytes
SHA-256: 92625879e86d1e59da6002f32ff0f95461ef5f2fb7b4b01f6a4fd7f7518e335b

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