Malicious PDF — malware analysis report

Static analysis result for SHA-256 3763863b7faab166…

MALICIOUS

PDF

76.5 KB Created: 2021-09-16 01:18:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2561d02c2d67dfa35394ea74ce5ebd09 SHA-1: cb304c7d63963a5a071b57bbf1eba18cfce2125a SHA-256: 3763863b7faab1666d1dfff299380c1e874f338c02504e67d4c569d44fab93ac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised websites, suggesting an attempt to redirect users to malicious content. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' specifically indicates that the links are hosted on compromised WordPress upload storage, reinforcing the malicious intent. The ML classifier and ClamAV detection further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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
  • 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 http://seidels-mineralienwelt.de/images/uploaded/file/zamimewabis.pdf In PDF document text
    • https://virker-ikke.dk/files/96123283728.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138401da8d72---siwenajitukikuf.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/novavugup.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/70002288411.pdfIn PDF document text
    • http://bdn10.cz/files/file/97922709927.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/lajabeniji.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/fuwujakavesu.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/razebomu.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/1866e7246b88d797ec34984a66ed3c00/xokaxifozamigowufa.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/voduluwiriwikoxi.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109072048439398.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/ee22054b6554dd7bcb49b013f7df5703/83402035260.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7e4581eca---93887460733.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/79047039695.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/68833355626.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/161319f0a43adb---wububukas.pdfIn PDF document text
    • http://freewest.at/39347746352.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/wawinabiwewoluzorak.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/kigobilupe.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/powogixovedeligodavabajut.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/mupupiworepuzeteraketeg.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/74935417974.pdfIn PDF document text
    • https://vendax.ro/files/file/50990684870.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/tovep.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/pusuvu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=binary+app+download+apkPDF 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_off0000c895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC895 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A7 17544 bytes
SHA-256: aa6c109077b77212cfb132520d16b3d95c4c79dcc443a2cfd0d5d4335291147a
font_02_sfnt_off00010d67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D67 10332 bytes
SHA-256: fbea7a1afcf125bd417a282644ba68a6e72820c8651e1cec05463da9f23d0f18