Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddfa19a5fdefe1c7…

MALICIOUS

PDF

176.2 KB Created: 2021-07-28 13:35:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9b476ad24d187994605240c8520532ae SHA-1: c867ab1fe416b64fa10c198b83e90e1c047fd41f SHA-256: ddfa19a5fdefe1c76eb06f0aa03579fda65b7e9e16b70e75dfa7d0fb679c3e65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicative of a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e176111209a---87754260937.pdf In PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b294ae5935---pudeg.pdfIn PDF document text
    • http://adbuffalony.com/uploads/files/wiwojagomo.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a702532ad70---55905369919.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/55265791555.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/10644582243.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/46112052474.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/suxusuguxevo.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/livofapinipu.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/f272d9a80ac841cbf5a03cc6240f39d8/4934472669.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/sakipilarid.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073bcfed1470---jizuwowipi.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f99b43363b---mideguwin.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5fe696e53e---korifirikisakururemetu.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/kojuze.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/nobikunozewisoxalafekakuk.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/97251f1ec20005888bb46895d87fe3be/vosuli.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d241d0e02---33061408052.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/v3jg6it22g4g1m8qfrt64h6g87/92293340215.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/35888281777.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/6765460378.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/xesivajid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=what+is+the+pass+rate+for+the+cpc+examPDF 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_off00024e95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24E95 10692 bytes
SHA-256: 3c96b9864a31dbfb94df67871958deb013be5cb6a282bc3269f8e3658d522af0
font_01_sfnt_off0002672c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2672C 18464 bytes
SHA-256: 068af0e1369c89edce8dce19b60c82eceaae5485b5370819f18d740e6c14abb0
font_02_sfnt_off0002984f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2984F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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