Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ff1143e66ee991…

MALICIOUS

PDF

88.5 KB Created: 2021-09-03 18:36:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0fa00564fefa00c180f4de005551c702 SHA-1: c15ade80944f1724f18d188d8a52e22a4540e013 SHA-256: 21ff1143e66ee991ccd7dd0b41a3c358cf1aad055f5ee820b63b9759ed16d833
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. These links are likely used for phishing or to distribute further malware, aligning with the characteristics of a malicious PDF document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://medvor.ru/uplcv?utm_term=light+and+shadow+drawing+pdf PDF link annotation
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/1cr4dlb80s9kllo4q3brbn6um0/21644642905.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/42632232320.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/76745555348.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/vevadalopidanigemoxexutev.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/pidezedakoxar.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69986366982.pdfIn PDF document text
    • http://jouezadomicile.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/toguvunijota.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160905a3d2626e---83046820447.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b265a0e62b---momenafukalor.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed3a6014aa---minarovewadawuzalakip.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/fijufufamolonapizibix.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/raxefepifuzazepolu.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210704112612_j0wmb9.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff1cedaa0f---nolubefoxuboti.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e60c77b570c---60151738330.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/mapokipokinibapubin.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/64268602851.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/vekilebama.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e72c561d2---fibijawifapivepugoxake.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/efe7183c0cfdf0e2b501be6112e2debd/sawetuvodukem.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/soxitevibize.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/84956883413.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_off0000f8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F6 16912 bytes
SHA-256: 664b2cb9fdd1e18e52b44d60dcf5df384b34e6080ffcc27c7799da0a7416da00
font_01_sfnt_off000124ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013cc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC3 10644 bytes
SHA-256: d84e8218071d2f832af31e03844057124abdd8e1f129c041ac3c84c4ed2652bd

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