Malicious PDF — malware analysis report

Static analysis result for SHA-256 195ec06ae0d690b1…

MALICIOUS

PDF

81.3 KB Created: 2021-09-17 14:17:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d8818fdaadb05963e1a5c890bd4007ef SHA-1: 8317dc82273cac11a533d35a38ed1c0f58a5938c SHA-256: 195ec06ae0d690b1a7c32a84f2906e4601a51dc2b6c2ee03cf647a2c5899f23d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to compromised websites and link farms. Heuristics indicate it's a link farm on disposable hosting, likely designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=is+mi+band+compatible+with+android PDF link annotation
    • http://suamanhinhlcd.net/userfiles/file/74916496955.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d6b12cc58---latusajudulof.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/99298042430.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/bevipixofive.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/23958792351.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/15485217323.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/91031413582.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fec0f9e3ed---miwomosapabi.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/49898609530.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/27933923918.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/roxewuzenamemupubiwu.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/podaguri.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/12739215355.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/36497733159.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/70987952137.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/dedukoxutazonobazisojezub.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/75887003537.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/sixifulelitazipidebozopu.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613910b2078ad---20417371053.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/pikibaxobapovovako.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/9625556161.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/dogatozonesijinuzunega.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/36321352146.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_off0000d5c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD9 18700 bytes
SHA-256: d8d0f1ef5477414295d51efff3e25ba0c244a97ee2ae6042c08affe84720ab5f
font_02_sfnt_off00011ede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDE 10956 bytes
SHA-256: bb0ec4eaf2e12c237d30b6c8ce2305b115c2622c6e373dfd232364ebc4ee55e8