Malicious PDF — malware analysis report

Static analysis result for SHA-256 f197bbf8095db716…

MALICIOUS

PDF

81.3 KB Created: 2021-09-11 19:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 63d581b4fbd86d9b1fee6e3d3f9559a7 SHA-1: e02723a5dcf18696d6997baab91d80ad237fabb0 SHA-256: f197bbf8095db7168ca896530472883ad4f8037a13896f9ff926e511df41a3c5
112 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous URLs, many of which are hosted on compromised or disposable domains, suggesting a malicious intent to redirect users to harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicate a link farm designed to distribute malware. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=gta+5+mod+android+download PDF link annotation
    • http://akekaluck.com/ckfinder/userfiles/files/32336121591.pdfIn PDF document text
    • http://cjmfgxfollow.morefriendship.com/upload/files/1112606850.pdfIn PDF document text
    • http://ned.ru/uploads/files/1335789647.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/kagadapit.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/25352858481.pdfIn PDF document text
    • https://bor-diing.com/upload/files/xakarepujokifu.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311dd036a46---xibuderuzuxigexoniwudam.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/88772683969.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/tafolegakilajapi.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/menekokajodiziweba.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/74074450093.pdfIn PDF document text
    • http://serting.eu/userfiles/files/nonabomubirim.pdfIn PDF document text
    • http://regcureguide.com/files/files/34043896204.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/34324859884.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613067948fc68---44164884565.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/samisikezitefutopufi.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/36087977701.pdfIn PDF document text
    • https://ibericadearmerias.com/file/nebupigizana.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/mupepinux.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16139a8a08551b---pofofopikunagoruwumek.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/48964055619.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/53965431320.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/sazefuzoxumax.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_off0000d79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB1 10368 bytes
SHA-256: 2369ff293b7ee1cf060f38ded9e2d0d15c6b556a627c57e2fb3cf599bbdb5901
font_02_sfnt_off0001072b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072B 18700 bytes
SHA-256: abbcd2d3fac8bd6e674d6798395e8bcfba68e2235cae18dd4caffb094ebb4cde

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