Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7332bc23891e60d…

MALICIOUS

PDF

76.6 KB Created: 2021-08-30 08:34:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 40a5661aeb2017a032c051743ff5a087 SHA-1: 66109571acae2f68590a018a07db9a6a9949077f SHA-256: d7332bc23891e60d2e6f704f7526a889cd5a58e16964798f37162361ccfef105
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and the presence of external URIs indicate it's likely used as a lure to drive traffic to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ketchas.ru/uplcv?utm_term=football+conditioning+workouts PDF link annotation
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ca1de3b93---wuwibos.pdfIn PDF document text
    • http://bjjiffy.com/upload/55931496162.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/t0med0ivlq0mv1dkph99s3c527/78071611969.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/545048053.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///retefajusuko.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160ac484439d72---pinisexep.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/dbf8ec7ca4fe7271057a78bd590cd921/11190398086.pdfIn PDF document text
    • https://olterus.com/contents//files/46568199494.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/58142681808.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161173180d70d6---nebukajuwuvat.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/kuruj.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/gusuwom.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/13554902469.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160821c02003b9---kagulelopuledudarufigevip.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/lopubik.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/nuzupol.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/dfc71e10ff51ccfa0dc45a19bcb833c8/5819011265.pdfIn PDF document text
    • http://vrtaspol.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/jeputatafixodinuferal.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/80486863543.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/3894044121.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/kerezewovefiramaduwasetip.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/77418496041.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/wibesadinakevarilexin.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/bajugapuveguvesosoxotaza.pdfIn PDF document text
    • 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_off0000c77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC77F 10808 bytes
SHA-256: 559d1eee96448fb797f00f6d548bf7435e5fac50bd450a52a571af11f76d6204
font_01_sfnt_off0000e062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE062 17156 bytes
SHA-256: 106856229bd7b5e8510dd807d5a575f05416a180e80b71a540662f450953662c
font_02_sfnt_off00010c25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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