Malicious PDF — malware analysis report

Static analysis result for SHA-256 f37ac3eb364cab88…

MALICIOUS

PDF

82.3 KB Created: 2021-09-16 17:08:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 968a02420c674d9badf1c98c1d3052a8 SHA-1: acaf6a80ff316ef94b358fb38a793acc76595e01 SHA-256: f37ac3eb364cab88c77cefdd4cc9c7fe7152a95c31c8c1499bb0f3e98d42b3f4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://terredellamagnagrecia.com/userfiles/files/lusufexumowakaju.pdf In PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614203532afcf---xukekodakakebolipovaz.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/nowajug.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/74445229468.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/28648284728.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/namotujarel.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/581ea30508db4ea220f37f137f67bdf8/37403595867.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/xipik.pdfIn PDF document text
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/vesof.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/tolidotirozositorulibax.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/makesiniz.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/61594758057.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/69999510087.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/87676903894.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/zatezajazabaruxid.pdfIn PDF document text
    • https://tckontrola.hr/files/5032637961.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/getusafogal.pdfIn PDF document text
    • https://leifs-auto.dk/images/file/mixinosodesununinemedim.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136db20b0771---jamifowepusuvajazedosatoz.pdfIn PDF document text
    • http://centrons.com/uploaded/file/30622707861343a4384679.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/nivokifupesinividezetum.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f3a882da9---xubedotaw.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/62fd1a7ccf0ff8ac189950edac8a86a0/kabexovomojifusisedojek.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/97554025247.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=wallpaper+hd+android+anime+one+piecePDF 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_off0000df35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF35 17436 bytes
SHA-256: 0003f8bc2e4a57c2aa9442660a9fe20a9daa4873e339e7a11fbb9f02b8cea707
font_01_sfnt_off00010c30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C30 10504 bytes
SHA-256: 2e6f67d26196f2fba521f1b897aad2de11bbf6865ab90b24581d44c02fada684
font_02_sfnt_off000123d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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