Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ccf0f64707c0bc1…

MALICIOUS

PDF

71.8 KB Created: 2021-09-03 14:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 85394795b8b8642d1649d388779c7b12 SHA-1: dfe1d8ad2ab9f67ed30767feb873dc34a5bec88d SHA-256: 0ccf0f64707c0bc10ff2f912b367b18f68a158e75803e2e8c60288e84b82c349
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL distribution suggest it's designed to lure users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://bitree.ru/ckfinder/userfiles/files/tulotuwafulamiteno.pdf In PDF document text
    • http://marthomaiticherukole.com/userfiles/file/dilotosik.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-2/20210502064146819574.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c063e33b4b1---36959559481.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/62414348809.pdfIn PDF document text
    • http://esistore.be/userfiles/file/ramugewipalad.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/55990296929.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/d3fc2f9579b4664967c4323f8da29f8f/44209135896.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/38388212866.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210816002101_gzucv3.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/62965720330.pdfIn PDF document text
    • https://etadelloro.it/images/file/86922578352.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/2p8a9eessifkfk61iipbcevehh/bominokiki.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/73516363943.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/60337359185.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/cngd2999vifj52c6p8msj44lur/82452784593.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/2387a6159c867e13e635e9b0bd662aff/guwiturafebixezuvupojezur.pdfIn PDF document text
    • http://maisondequartierdespareuses.com/userfiles/file/sojemutinutipoji.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/wokavi.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/c81a9dfe704c189c46bbaa7284310cfd/65636167184.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/ridogafunadaref.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/d941c52203763fd989dca4810c96feb8/polabevatigudosarejo.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16087cc175c65a---netenexafiwopoduxuro.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/73944253151.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/79340624050.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/b1d61b4f669fdf522a966088e2623568/govetagopig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=caracteristicas+del+liderazgo+situacional+pdfPDF 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_off0000b9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D5 10984 bytes
SHA-256: ab69a985dabc2d4a97b5d04bf884112fc780be0de4aa05c98993043a16753c0a
font_01_sfnt_off0000d34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34B 15172 bytes
SHA-256: e0b84d38bd7f14150110529d13ccc39ffd38a50384f3c74fe1d6f5eb4c081108
font_02_sfnt_off0000f8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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