Malicious PDF — malware analysis report

Static analysis result for SHA-256 a96430d543c2b265…

MALICIOUS

PDF

76.3 KB Created: 2021-09-20 19:37:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 72ef6da5ef618f5eaf96eb8b6d08ff3f SHA-1: e6031a779b37b0aca64bb5bba1ceff4740b4cb3d SHA-256: a96430d543c2b26537ebd22859aa51c4d754d1bdaac4b56fbbfc70a55c067926
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://cross-winds.in/upload/contents/images/images/sewexub.pdf In PDF document text
    • http://michelschuurmans.nl/images/uploads/file/wejusebopon.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/65406104740.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139197fe6d66---gitivabekijixanozidekab.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/76355239546.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/20999287588.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/labafejodasasodomon.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/rikate.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5e1a82679---bipatewemexumusug.pdfIn PDF document text
    • https://posh.hr/files/7833906851.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/75249476965.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/vetazefut.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/83261899189.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/nuvubanerozagote.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f13ced9e4c---79254061099.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/95211760735.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/95839575192.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea554db61a---59487806241.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5fb1eafa7---pexitipopazabugogokupoxo.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/luxipagori.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/tuxoxumebakujoperega.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/nojelalakumijape.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/22320474850.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/namanedizusonidujewifa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=infinite+health+in+gta+san+andreasPDF 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_off0000c90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC90F 16800 bytes
SHA-256: b66f8434f1eed800b3e28f8b6224d5044f3eb3a0a052c89faa3974466d489539
font_01_sfnt_off0000f455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF455 10464 bytes
SHA-256: 13f8b847562edb3dc534575bfa57a25617a7cdabaa9c831e82bf68a6bb832c52
font_02_sfnt_off00010bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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