Malicious PDF — malware analysis report

Static analysis result for SHA-256 752d6ef410c9a86b…

MALICIOUS

PDF

78.6 KB Created: 2021-09-07 00:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f5f2d3ce96a670ca24a300c9664eecab SHA-1: c3c13e92276b3cb0722d600b12feecbe7add0a09 SHA-256: 752d6ef410c9a86b4e5af2d9c735eccee1003530431d623f31a30b83056724b6
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf9c20a1b31---zixukuxifed.pdf In PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/fizitogukewefofaxelame.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/1d38ed2c5e40c04ef0e91a545a53ba78/tevegofone.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/lozijimomop.pdfIn PDF document text
    • http://alothongtin.com/upload/FCK/file/tumomisedovi.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/sorow.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/dokujobo.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/19030317560.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc614e504a---48869635734.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/pafalebazuk.pdfIn PDF document text
    • http://zzweien.com/d/files/xagirenota.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/137b39dc83d698dc742b28db53754dd5/gazejusibamiwimefep.pdfIn PDF document text
    • http://bluefield1966.com/clients/26642/File/bufelalaxukejegesir.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/f59de4ed6fdd2d298b0d94a86a7d95f3/86360806538.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9fe41ace6---8444694922.pdfIn PDF document text
    • http://cy2hand.com/userfiles/48105608867.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/50202352541.pdfIn PDF document text
    • https://mszukam.pl/dat//file/sokakotizusubejevofizobot.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/8eb975391175afd828bc85ce7ad3f4b2/jowari.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea0ad676fd---taxigefikutisuwo.pdfIn PDF document text
    • http://jouezadomicile.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/liwobora.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/icb41n6o112ie8rc15khqmerc1/rekalu.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/woxopunegadumen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=convertir+pdf+a+excel+gratis+completoPDF 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_off0000cae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FE 11164 bytes
SHA-256: 409b10df997f76993d823c148e2c9ae665d814aed74f2edf2d3024f21f2188f9
font_02_sfnt_off0000fcf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF3 18356 bytes
SHA-256: d8f5fd4f0ff9f8f2dad0d8ede2a987aa38863122ff803ec140bef5ea6e17a349

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