Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f748349d7d82ad7…

MALICIOUS

PDF

88.1 KB Created: 2021-07-07 18:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7edb6f5982cb5a53b9df1d60707a9f04 SHA-1: a411df8e1937483ca21d6fe36403a315d7960ed0 SHA-256: 4f748349d7d82ad7e09420263440a528a225215c337ee8ed947f9315a927f5e7
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content. The document body is unreadable, but the heuristics indicate a clear intent to redirect users to external, potentially harmful, web resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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=government+by+the+consent+of+the+governed+is+called PDF link annotation
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sedagudopapexaretesotupo.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/e7ed63e6d77bcbe20e9c5c759a4d62e7/fuzixewogiretip.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/lenoja.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/46493998355.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87f85da2c0---69728777951.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/bcf951448c0bde983d1736a3a526b42b/juleteminatimulitezixa.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/15783072959.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/61106357938.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/katupiludoragudiper.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/4f65c14a56bc1b971b6bb5287b98e2ed/pakilumotezisafiwekov.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a5f7035eb---46498606955.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/76911071383.pdfIn PDF document text
    • http://advicetao.eu/pictures/file/27343284421.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16082e3605a6e7---sewalenuropupulen.pdfIn PDF document text
    • http://esejsc.com/upload/files/2438115993.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f46d24b98---77862169933.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/8oq2h4gmu221d8nlcgcf6gteji/sojodidomesovik.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/35071451202.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d8f08764f---3136282740.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a52831af9c9---43358038499.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076942a09b33---tusemuxejifaduwel.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb35247edc---50427142383.pdfIn PDF document text
    • http://fittbike.hu/files/file/pesovikutazulod.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_off0000f34c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5E 17376 bytes
SHA-256: bcbd7ac3395377df70fa6239370639f344bda6a64adafa5261c8b97027a15875
font_02_sfnt_off00013855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13855 11280 bytes
SHA-256: 8b9d719593fd042cab2b777a57662c28ce48b8a987fe2d9210b40e77a069164e

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