Malicious PDF — malware analysis report

Static analysis result for SHA-256 5060a4f76c47b498…

MALICIOUS

PDF

85.2 KB Created: 2021-08-08 11:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6b02e9fb25224752ca02f0cc651e97e8 SHA-1: 195c5882cb87bbd138388516a9ec15f7c080175b SHA-256: 5060a4f76c47b49842adb5adf56bb52dbdd45cae69676a4f8568532482f518b6
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file functions as a link farm, directing users to various compromised or disposable hosting sites, which is a common tactic for phishing or distributing further malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests an intent to host malicious content or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://czechdidgeridoo.com/admin/upload/file/46917379993.pdf In PDF document text
    • https://bushregenerators.biz/userfiles/files/77141120188.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd63e32a9e0---nesumabipu.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070cc9a2b624---mopukumiliritanuse.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090caae4239c---norobowifaxebuguro.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/6bab749bc2d873fdc691a6563396c5ca/mexomelizuwijikopo.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160abb03ccab87---kivonetofimokax.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/99e9a1dacfa8dfa9bef64b28334b2f34/14446705757.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/16520046166.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607855640f4a6---23519129767.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/96902310620.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/dekugukitomafagaxorata.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/nozojomosilane.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa37868d04---42137529670.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/7e1df9f9e53e86638fffef814b4f1e8c/nukulefawokimivebon.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/melejetubewekusemonajov.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/pixepeporoso.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b9879eb67c8---fipexulelusesojonab.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/7d075cf0ce0a4ad5fe5e1ecbeaed5b45/5666038658.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/87205474546.pdfIn PDF document text
    • https://paperland.bg/uploads/file/jasedoxiwowido.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/kelasarerikimo.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/94927776753.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/lozopozonumopigusalok.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa9a808093---24856576388.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=remove+netflix+account+from+samsung+smart+tvPDF 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_off0000e9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10200 16748 bytes
SHA-256: bd77fbdf5aea18a96295f1b65b585355d97d444c766acd9c06f262a5ca2c2151
font_02_sfnt_off00012db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB0 10992 bytes
SHA-256: 332e7e1c990e0c2d7cdd4ee4e5a6b996a652f1aedf3d75abdffd8b4fe2e65dda

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