Malicious PDF — malware analysis report

Static analysis result for SHA-256 7428604e4a7374de…

MALICIOUS

PDF

98.5 KB Created: 2021-06-28 01:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9db86880232a6163cff228a795482df2 SHA-1: 1e3206a13c5b1b9ed8e51f4e8d4b593466971fc3 SHA-256: 7428604e4a7374def9739b509b99f6cbe9fab286056aadd2eac8a0309929b13c
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories. These links likely serve as a distribution mechanism for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9802

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://coretry.ru/uplcv?utm_term=dua+for+stomach+pain+in+english
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/855f6abd6767e5598f988ab7d1d3abcd/48732707653.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f41fde4329---sezewafipesagudimolep.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a74986b05a0---70766152907.pdf
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/48404495281.pdf
    • http://kimdaiphatsteel.com/Images_upload/files/26791179090.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd8cd5467d---61150087227.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a5bbc6fad---xubojupuwitadakufogas.pdf
    • https://angelsstaff.com/uploads/file/bodabesirujef.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca554c398d---zojeretajugoxaro.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4b808efa8---dukuka.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ade0ae6aa3---63595425382.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af699ccbdeb---gitufodugixefaxexilireg.pdf
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/e85a2f03003988246a09ff991430ea02/dodufafi.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4a1d3f92d---kikazuxupafudotalerax.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609847466d048---38488622049.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609241f68af2f---75066007169.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16082d26694a31---paxijez.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c2705070f---vewulabufovemivamelerexob.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/05b191fc4748b75379ad19cd8f10f4be/51431460491.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3136535da---97443241109.pdf
    • https://istocdukkan.com/userfiles/files/91619151811.pdf
    • http://www.clc-engineering.com/siteuploads/editorimg/file/88215634745.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160924eafdfdd5---zazavilumu.pdf
    • http://ankamet.com/userfiles/file/kukamafil.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/cbaa5350759ad2497b12ea572a807c31/13937944852.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a687ea4e5da---64624771237.pdf
    • http://www.gamylai.vn/uploads/files/bakugapozofukubenodas.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_off00011d27.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D27 16792 bytes
font_01_sfnt_off0001353e.bin
e4e2754e1f3f702c9c3c4fb2293e307fd269bf984d448674e864e3895a1f8798		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1353E 11028 bytes
font_02_sfnt_off00014ebd.bin
2171748bcd8c5bffd0026da99554c36694101b8f03ac3107ac7258aab21e5254		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14EBD 17112 bytes

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