Malicious PDF — malware analysis report

Static analysis result for SHA-256 791d095fb44d8e7d…

MALICIOUS

PDF

80.9 KB Created: 2021-09-03 18:19:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: dbc692bfb934ab5d601fd5435aef7a2f SHA-1: 27ae5a100f92e2ac923885b28a93cbba12670cf2 SHA-256: 791d095fb44d8e7d3589b3f6f0f06bd16d47cd9334b3599e80c573a6e3a48514
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pistant.ru/uplcv?utm_term=converter+doc+em+pdf+gratuito PDF link annotation
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/roludoroxaza.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///84643331115.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/44757316354.pdfIn PDF document text
    • http://hangquangauto.com/files/towegazuturemirevativuf.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/2253220776.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/nininegorininuxitaxovu.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/q6l12a4dcbmi6te0207nv73771/29708954154.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/nawegugiz.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aad629114df---juzilavazivimujogexova.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/49277588775.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/59092373965.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/75001705982.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/59876a94b109147e2cc9531626db9c09/lufixozebatope.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16105d0640de3f---86738295869.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/db7jemgsflca2vaqts5qnoat26/76750077786.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/lajowivavifugov.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f1f8ec6c5ad---bajegew.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/movinuwonesu.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/voxigumorujumedefozepux.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/a95ba9f74355034a9e50c9b63859cf07/48500872181.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/xukawejesisebulezo.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/45895112522.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/8947965460.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_off0000d503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD503 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1A 10948 bytes
SHA-256: a53397445f2d6b50140f874b47cb73babb74a8e51796771ef387cb141884b716
font_02_sfnt_off0001064f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064F 18300 bytes
SHA-256: 79d03fd1a6e62c12c7f965db25297d294d86b31914590df05a98f4c11d74b39b

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