Malicious PDF — malware analysis report

Static analysis result for SHA-256 721f519d18811fb3…

MALICIOUS

PDF

90.6 KB Created: 2021-08-04 02:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b7015f3cc6cdd5f16b6f386ede42b584 SHA-1: e53608299d7b40895dbfbe7aaf43f420b062addb SHA-256: 721f519d18811fb3e57c53288e4696b95bc0f4acd56f3febe9f1273a7a7bd588
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to redirect users to malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly supports its malicious nature. The presence of embedded URLs and the nature of the link farms suggest an attempt to distribute phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/ub1f79kp5ourgrhlojmfoe7rcf/durelu.pdf In PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/4aprq684l6759va1m26hvsho7m/43000032487.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/peratakarerusirerisu.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/45661449175.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/42686460232.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/lerapefazo.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a8889650a70---mujuvuwimotube.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/7714e57367f27b204be95588e85612d3/mufuxa.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f563a12d1af---xugigaretulotixixegizo.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cabac61559---fonip.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16078d73b55055---70659981252.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839ffe7969f---2928579147.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/c9956e5ad30087fa0291c34b8ec74474/84048847280.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f89e4375b1d---tuxivokozomibosamugaju.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/musili.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/f6d03p9o56bob7t41l989i3g47/nodukivimada.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/30392757732.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a4c477e2f---roxagakesorowuz.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f16feda2c7---ralegezadikebiba.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/q24q9iff1hmbubapljsciqi0h2/sexijasafikarezaf.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8e6b1385e---muxezeji.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210706071921965.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a5c0cb894---57784525004.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=what+is+survival+for+the+fittestPDF 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_off0000fd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD98 17220 bytes
SHA-256: e0994c9949685f703f6c50c04eaab898cd427d932a25cf760c2d2c37e0a9fa77
font_01_sfnt_off00012a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14265 10364 bytes
SHA-256: aca32c2af6312ec85a078f4b201f461252a527f7e05362f46de0bf277609047a

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