Malicious PDF — malware analysis report

Static analysis result for SHA-256 284dae4526cf6c60…

MALICIOUS

PDF

90.4 KB Created: 2021-09-03 06:27:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0b28554369d24e6a3157c91f845fde01 SHA-1: 7c6af872e417d357502b86a585210c783684d4da SHA-256: 284dae4526cf6c609157bbdfeefc23b61a7f4e00202db9fa6bd57a3d9318c3a4
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a link farm pointing to compromised WordPress upload storage suggests the document is designed to exploit vulnerabilities or redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the idea that the document is part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/1372646bc03789995d91893680a30a4c/sijosekomofegedefox.pdf In PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/0fd02a57bdc753352269c06f3c5100bf/53902357116.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/sirujudalogeriximof.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/de0b3e633ebd17f904ec1e3557d8315b/suzuwogobivi.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/vosot.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/qje2g943v9siqtq5p0luf5nou9/65529180575.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/21901477433.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/ruxekumagegaxutori.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/42084421462.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/3a4867f521b6c4fb04738c9976bd2ba7/xelesadomezewevuxutonidi.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/ffe7a0ebad964c8aeea3f9b4f23ba350/lefavofuzed.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/tukadekajip.pdfIn PDF document text
    • https://maria-galland.ru/files/file/kexebenogiritoxap.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/fanuz.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/25708752851.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/f2acc9843ec9d8df56273fb0807a9ba4/7039817650.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/85637015555.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8f25437e2---55694310826.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160f17b8c8a76c---97325022266.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/0aded72c43dbbd5fbdb38ba58d0c096b/19405188102.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/641410322.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/87721257661126b80c7156.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb59c6d220---luvumonilafawugesuti.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/32426454545.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/59235748159.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=resume+format+pdf+with+photoPDF 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_off0000fb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11385 10844 bytes
SHA-256: e80472d67cdfedf607af497649f6441a5c300781dcc02bc0fd91f9189941d6f8
font_02_sfnt_off00012c9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9F 18124 bytes
SHA-256: 6821b1160cb183e806c7ddbb0942369233faa0d93d0c129f699e9ab936c2d820

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