Malicious PDF — malware analysis report

Static analysis result for SHA-256 713a3973ee6b2f13…

MALICIOUS

PDF

135.9 KB Created: 2021-06-25 14:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b35abae50d7642fd65d4b6faff2ca0de SHA-1: d85cb44cc704293a36e2aa32ad9206e1e1b3077b SHA-256: 713a3973ee6b2f13e335d5ba439fae40c46e6e7306d559ed7ce06d5772ee165c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious content or phishing pages. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high number of links on disposable hosting, suggesting an attempt to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/f17275f5c70ab416e79663ff0fe35c12/5480465425.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160985a402c46d---1647500127.pdf
    • https://store-connector.com/_upload_bilder/_filemanager/file/79002889205.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608dba56ef556---watifetabo.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16098e0ec718d4---87057386432.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b4f98ff81---vuwulan.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a3381332a36---tabunakodif.pdf
    • http://albatrossmrn.com/konadnew/userfiles/file/23986195362.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f11ca17b5---wosonijiwutub.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/43a341a8b3f4031a5a9f6d7a91c8eddb/90346920891.pdf
    • http://thankschicken.com/uploads/files/luxijulemoruwu.pdf
    • http://forglass.sk/userfiles/file/68975175005.pdf
    • https://alternativecarrepair.com/userfiles/file/92606927920.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d272c74638---96974221717.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe1d6c8f6e---xegubowewavosaxavadazu.pdf
    • http://nhhs78.org/clients/63854/File/nikapo.pdf
    • https://mmszke.hu/files/file/67058679483.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=bba+in+hospital+and+healthcare+management
    • 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_off0001b051.bin
c322a3ac72de27571806f498fd51a4a95cc27a3928272366ac36cc2394d1885a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B051 18528 bytes
font_01_sfnt_off0001e08c.bin
fb3f73577bef0cfcb2c2b83941323d20ea2bb12258fb485822a5788194f4c315		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E08C 11152 bytes
font_02_sfnt_off0001fa02.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1FA02 16792 bytes

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