Malicious PDF — malware analysis report

Static analysis result for SHA-256 d236c0025405a304…

MALICIOUS

PDF

79.4 KB Created: 2021-09-07 08:04:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9eaec326ba874c6319764bbb22c94875 SHA-1: 0a7723237210f19a95cdb248c9065357d1601810 SHA-256: d236c0025405a30440540a9fd36934cadb90db0cc59da8fc2356ef6457e54be2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Numerous external URIs were extracted, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The document body was unreadable, but the heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://infrive.ru/uplcv?utm_term=scaldabiberon+digitale+chicco+istruzioni+pdf PDF link annotation
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083be211f8e4---pulafikisu.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/jumukulirejibaxipesoku.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/6a0fede72d2e32d8d057f32f15a2f128/mukep.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160923580b1f19---larixolijubawef.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/38984128186.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/9b6431a3b7edb853acbd858600ff792e/5407614992.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/96380573743.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/zefinejunipikizefu.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/07om8i59suj4ja541iqm65muto/basotogazigedoledizigixe.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/zaritiridovoloxis.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/90124527750.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123535e3d421---64492938555.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608025b909fb3---73228226601.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/07/file/202107061150018390.pdfIn PDF document text
    • https://stvorki.ru/files/file/viboxazafawedixukikov.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/59136526329.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/c3e0806723fee30d0e152708de178f00/17792841653.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/kowatoregal.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/fovawodevuni.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/38076826651.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/85492424388.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a36389b6b60---vekawedizomofukovezutesi.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/2f1323ae2a8781ca29f4c3af146219c3/71725848562.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/q9gamk7ptes5ss6j9u38i79hus/lutesurudebukegewabunop.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_off0000d1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C9 11272 bytes
SHA-256: a789f01ccfac83042444ea31a241d0970f50304a843680ef354fc9fa947ae1ff
font_01_sfnt_off0000ebbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D0 16908 bytes
SHA-256: 715a2e98c4983966ba2a31f8a961ea8fa104a24df58441e38fd576f270180727