Malicious PDF — malware analysis report

Static analysis result for SHA-256 9478be281d527434…

MALICIOUS

PDF

78.1 KB Created: 2021-09-28 12:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f06b3bd3743765097d9b9811f63e9bdb SHA-1: 14be30cf7ef3f5feedbe42fcb93dd91cfa4c5a01 SHA-256: 9478be281d527434accd1ee1865b76d1ce64476aae1cf17d0caaa3aa7916c47d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues about its specific purpose beyond the link farm heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/feugt4dl2esd393casl9qfjqc6/34791223296.pdf In PDF document text
    • http://eprdel.cz/userfiles/file/radimikozupirezafuka.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1630742261.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/sotatezitos.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/forodutelugiju.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/51774662298.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/tudejeduzuxasenareja.pdfIn PDF document text
    • http://alefart.ru/admin/ckfinder/userfiles/files/37731712076.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613478618a6c9---58205894503.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/tufudakejuvowimega.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/43212924497.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/sodun.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210916040755_1058804308.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e0c94d02f5---silirugexotex.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161414e6f3f154---kifazorof.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/61844614769.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/161494e4f2257b---golavovilawesamis.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/xuluvubudaxevisotafi.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/kazodiluxukuxejepux.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/082fb2eed17ab04d724f204a4748e481/likotaliwojodoxez.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/61519538391.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/59012800698.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/3mdda14q9o3j8gl8bsvupjt174/57899040361.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/farurelumamojibukuvif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+make+a+live+background+on+iphone+11PDF 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_off0000c3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C2 20256 bytes
SHA-256: ede54941fde80d4328c20a0ae3fccd2d7947f386b1e90a2573e11b6e3a86a5a5
font_01_sfnt_off0000f862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF862 11320 bytes
SHA-256: dd83469e976a47e90ba560290b025209dd14b700f7f6f1620a1133a1731d4f8b
font_02_sfnt_off0001126a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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