Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a2bc5242e66123e…

MALICIOUS

PDF

78.6 KB Created: 2021-10-20 08:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d2037e6c87450cad7433f97d3008c884 SHA-1: 79eaad3c900ad4b070a90eadc5dbff94a7f884b1 SHA-256: 6a2bc5242e66123ed127fdd38881910ba0798a3702a6bb92d522218e88014804
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating a high probability of maliciousness. The file contains a link farm pointing to numerous unknown URLs hosted on compromised CMS uploads and disposable domains, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the presence of numerous links and the overall heuristic profile strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/14d2a2f1b5bef37932f63fe99f818bbb/2476314176.pdf In PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/zarozatuwa.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/ruminoteziziv.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/kamekofi.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/161585135dd055---98919756727.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/66187649932.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/13134862736.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/37315947725.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/zinubagawipibu.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/59301611583.pdfIn PDF document text
    • http://foodchemsino.com/d/files/44777813016.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/16012291076146f667ad3b1.pdfIn PDF document text
    • https://5udua.com/contents/files/rorikalabufowijulebapow.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/34996815387.pdfIn PDF document text
    • http://gewald.ru/content/Files/66632285350.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/mivigan.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1615be41530c17---87673549402.pdfIn PDF document text
    • http://badgerhillfarm.uk/belobuzovegobemurejon.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a94826b005---sodedoraxoxumelir.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/7vdu90b8bcj33jh500cjrsnru8/41416340951.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/20055711588.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/oscUj7J0Gjw/uplcv?utm_term=how+to+fix+a+dead+lead+acid+batteryPDF 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_off0000d2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AB 10628 bytes
SHA-256: 07aa9bcc8e67d4233494ad211f470ab90f2cdc42b879354dfc946c0c0488f177
font_01_sfnt_off0000eb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1F 16308 bytes
SHA-256: 168757899028694d2e9bbeb10196a1952223076aafc306f52b0461ca0917f867
font_02_sfnt_off0001152f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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