Malicious PDF — malware analysis report

Static analysis result for SHA-256 402d0be49ba63b53…

MALICIOUS

PDF

84.8 KB Created: 2021-06-28 02:33:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 420a544f7fe3a43bc3a29c5ded32007e SHA-1: 5e3863c0aa7145c12296e71851348790ad8bdeda SHA-256: 402d0be49ba63b5300267952e883a740e432a992a6ade9be967fa4b0163671d1
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised WordPress installations or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/330180fa1d98264d11ad709c832ce065/39105313489.pdf
    • http://bogelaipigeon.com/upload/file/vogumivob.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/18b970238a5f4ca0a79201756641a1bf/56204643487.pdf
    • https://hasekei.jp/userfiles/file/sudesifobukumifuwenip.pdf
    • http://www.aqsclimited.com/EditorImages/file/24047475744.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/vck4aivsednrmitaugubmmofs2/bemotidor.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae4cd2480d---vumepego.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/61fbd41550a16aa966b993082c405035/tilolamufezivaz.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a89791c535d---bofilofegagafoxudagepulo.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c6c25453e---jirurulelefugugotebijopal.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dbbd4dc81---bivusesidexomu.pdf
    • https://aluminiosarla.com/userfiles_arla/files/40127794765.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160abe6a6e6120---gupibevorixolojoliwaf.pdf
    • https://stallion-international.com/userfiles/file/mutomamuwidolikuvesaketoj.pdf
    • http://arkystudio.eu/userfiles/files/82750318959.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/icqpg349irse1kdk30o4g8u930/76417250290.pdf
    • https://planet-for-events.de/userfiles/file/59823312115.pdf
    • http://adhdesign.de/userContent/files/20210623142604-zomopuza.pdf
    • http://rasmesafar.net/basefile/basefiles/1180417376.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d69093cd46---limipi.pdf
    • https://sabagdasarov.ru/upload/file/39284801157.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b956c48ffe7---tavogisowakikuxiledan.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/6d2a92ac43f4ea407895824c34e39264/9996545701.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=best+free+fire+screen+recorder
    • 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_off0000e9b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B5 16792 bytes
font_01_sfnt_off000101c7.bin
c18335b70db5b431b82f8a9f37c3752572cb35bb9f83c031ca4fda3df1f81448
pdf-font-stream PDF embedded font (sfnt) at offset 0x101C7 17376 bytes
font_02_sfnt_off00012ecb.bin
d9216aa69f2275ad89ff3d932ffacaa8ce2cee67c040f2300ad279b6474aab72
pdf-font-stream PDF embedded font (sfnt) at offset 0x12ECB 10312 bytes