Malicious PDF — malware analysis report

Static analysis result for SHA-256 7afdb6ed87e47f59…

MALICIOUS

PDF

72.0 KB Created: 2021-09-18 13:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bf9eb95e03ab3e967683a680b5c0ba7c SHA-1: aaed2f32074e44f4f5c45b08e066e37329301dff SHA-256: 7afdb6ed87e47f598050b9eceb75282fe0fd1d089757d0262803635eec74729f
196 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and employs a social engineering lure to prompt the user to install a browser extension or update. While no scripts were directly extracted, the nature of the lure suggests potential for JavaScript execution or exploitation to achieve its malicious goals.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161314748f3d5e---98267404312.pdf In PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/wobuliletopixuniwazifafew.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pejulor.pdfIn PDF document text
    • https://tebra.si/userfiles/file/puvisixokafefunusuj.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/328952856.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/16643641411.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/82322259964.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/tezotinokusiwosugalu.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/47645076686.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a890f595dc---nasosoninomodup.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee6f31d735---rijatubolawebusolin.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/fatabajabupedabokivaba.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/gixujewogol.pdfIn PDF document text
    • http://sokole-tps.pl/userfiles/file/62904128429.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/dipidevifexedowewita.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/98975014954.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/5664867639.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161400f48847ec---gobefujexizefi.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021091001510773499.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/i0g4b2j81o552u2d5fe8qsfipv/wemezewalesulo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=copy+contacts+from+iphone+to+androidPDF 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_off0000b942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB942 10984 bytes
SHA-256: a39fbe70c91b4f8eca6ff7cce93ccb628c4ea96aee9898d2e6edf80d76e2e22d
font_01_sfnt_off0000d2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB3 15860 bytes
SHA-256: e58ab90c3270a92abbe801469d402daed791a872aa23916552b2ae309464504d

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