Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4357a5d2418b55f…

MALICIOUS

PDF

95.2 KB Created: 2021-07-17 02:30:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 95d0637c4f84e3750f75383cf1ef3f15 SHA-1: e625b17467ca821c50fcd0feb985758b05af7ba0 SHA-256: f4357a5d2418b55f1af8ea8878f2217c9ba766ea4254a5be2aaf7dae4c09e08f
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm and contained numerous URLs pointing to compromised CMS upload directories. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The document body was unreadable, but the presence of many links to potentially malicious sites indicates an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/ee2bc8c0f4215eca1620ab0bbfabc56d/jejofufonuk.pdf In PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da82b9b2e0---49416147461.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4ae365b61---pukuxasolutewisuve.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/11576197166.pdfIn PDF document text
    • http://fitviewer.de/files/file/duvenus.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/tujekokogitakimibelejo.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f8c11ade4---757039387.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608712b16582f---86491706726.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbc7bac291---60918771940.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/45168442742.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/64821820438.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/efd8cdb04133d04b7eeb8843bf2002d5/vupufevafa.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/tl9uc5bqd6i0vaft6skk379ta5/gezab.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/3daacc978b8b28354cee92e4bcd12669/lagotevonukewug.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/dosigalafofelobeliluziru.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/mibirave.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/58373213499.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/q1h0408vu2oukg7jc5g7j1m4cd/22384827305.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf867cccf6---80838202379.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/cab444b4e644879fd30b74a5253d3223/54043142763.pdfIn PDF document text
    • http://webhenevents.com/clients/868374/File/dimijuzelotipo.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/bixod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+get+more+apex+tokensPDF 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_off00011051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11051 17252 bytes
SHA-256: fee2f585afec79e3d5060ba7a2dd938d91e833f772712bb58812f6d24a76ea08
font_01_sfnt_off00013d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D7B 10728 bytes
SHA-256: 34aba1486adf3f72d793ac0b4909cf1968c00a55f8a37ae49028b61dc3e48200
font_02_sfnt_off00015635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15635 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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