Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4ddcc8b58474221…

MALICIOUS

PDF

93.7 KB Created: 2021-07-04 07:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a55caef714aea52f1edf760f04ad8f8c SHA-1: 59ef577e81fc6103fdbe9f4409b9e08efc1c08fe SHA-256: f4ddcc8b58474221261afdf9cb09d54a6cadececd64735f260453fa7c79e543c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • 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.
  • 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://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a54cc911d13---karuvavoditozeruwago.pdf
    • https://gtselect.fr/ckfinder/userfiles/files/bilikiwumalekoxozu.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/8ilahglao5p3rogr7g7hrjsbo1/zogamidojugimisutapatamot.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3c45d00a2---31388949801.pdf
    • http://inlovehuahin.com/file_media/file_image/file/ninedilufetalijov.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/0cf0a737f8e312f0603e60bd686df70e/85799553139.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607403c65e353---rekipesukasawufusit.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160992d7483c8d---kasutemezavejaf.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608242dc29fb1---wurimobetegezojelipagevi.pdf
    • http://wagnerpc.com/userfiles/files/baxisevaribu.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2bd3e06cb---70459743564.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fa7625a21---rurizupejeduvomawokituvu.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e2f98153c---23492571304.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c853dac91f4---61572713567.pdf
    • https://toolsatool.com/userfiles/files/lizojaxubawakaj.pdf
    • https://thefencedocumentary.com/adminfiles/file/jopum.pdf
    • http://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/befolanun.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16080783d90a34---jemajuxatarinuraz.pdf
    • http://oreade-breche.fr/userfiles/file/88672436040.pdf
    • http://dailythang.com/userfiles/files/tavowivogesamisegamenugi.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d1beb230bb2---zolofovafimexot.pdf
    • http://sotel-perm.ru/site/file/labotulemoferi.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/61f67cfe591be6045c2118a294ab7587/vewakigodulupadofami.pdf
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/boriw.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c064137a77---jidejaniv.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=cognitive+ability+test+questions+and+answers+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106f6.bin
288529c3502e3470babdafa3add890e8635015fa1e7ca97955821f1e18adb516		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106F6 18160 bytes
font_01_sfnt_off000136ce.bin
9b503c1250c50ea3493cdd77cbbfa6c41bbe416ac8ec1cab25702f201908a0dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136CE 11356 bytes
font_02_sfnt_off0001510f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1510F 16792 bytes

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