Malicious PDF — malware analysis report

Static analysis result for SHA-256 f42b3a6a6ea231dd…

MALICIOUS

PDF

88.3 KB Created: 2021-08-04 16:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: f10300a0ed04f2d74c3f5bb502642a45 SHA-1: e6df2c313d53f68b1ae3c2efc320d106c64aa25e SHA-256: f42b3a6a6ea231dd11fe1972d27625b8a2b1cddf3ca1d0dfb570208cbcef66ca
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. It contains numerous links pointing to compromised websites and link farms, suggesting a phishing or malware distribution attempt. The file's structure and the presence of external links indicate it's likely used as a lure to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pixomot.ru/uplcv?utm_term=o+grafico+da+fun%C3%A7%C3%A3o+quadratica+f%28x%29%3D3x2%2B5x-7 PDF link annotation
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607550e9c762c---dojadomaduko.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/79514059420.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/5c02o096k64b0mco3kfbj3nmdm/49208901291.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/62ac8e13382ba15e866dd06c761b4de3/dilakefujagozilis.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4abdd6b1b---ruworibezizepopika.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/33553598676.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/wosaneretodanagupifo.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16076a9f075752---92209599919.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d751109ad8---raguteliwejapojun.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/57690689042.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ad9e9b60e222d75e035eaa0d7d3cb051/zafibipusuxabobelofow.pdfIn PDF document text
    • https://resicolor.com/upload/files/sizodalise.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607404b25f59a---lupukivasebuzip.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/7g0c0qe9mo01n0t89eh54s9pr4/40468691537.pdfIn PDF document text
    • http://poetryforthespirit.com/clients/872464/File/31654951482.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/69133323467.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/3quml9pjpmhvoo8djbhht7jvj7/37655686668.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608774495fc3f---jidalek.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b57a3f3ea9a---wetowobulogim.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f2297ca42---18837200712.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607948085d8b3---64448021111.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/vomigojejujezemazuvom.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/xofusepipovepu.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_off0000ea3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3A 11856 bytes
SHA-256: 3f8d388fb15725afca08a3f6448f47142ba56fa4e04c48c756cb4220c0ae1cea
font_01_sfnt_off000105e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011df8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF8 20160 bytes
SHA-256: 80345b798c568bb9207b03a24b721b8e99a224bc6b3201d4cb0137980c55d890

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