Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb356e21200de860…

MALICIOUS

PDF

92.6 KB Created: 2021-09-02 23:55:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bce5de11928c12069b3ce6c25938f965 SHA-1: bc975814eb3d0b1e92f42ad8e9a76f3426ed79b0 SHA-256: bb356e21200de860f6cc27dc2b4498cfbda39b4b45f94a1ff69026ea8f9c3efa
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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 http://mariautonoleggiomarsala.it/userfiles/files/50545284055.pdf In PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/bv0uubnkjmrre5th81f0i1s622/616356642.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/3lv5jleueeiaoqm214tib99u1k/73336026603.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084032608dc0---nerisapotoragewalu.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/79927198610.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/88043502596.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608798d568ec8---zedepiludogebepuvipitotes.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160afa6b2d765a---63934798285.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/7aa5fba5cfc5ca967cbd93e0bd54c2a4/juxuresumu.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ddb948b2b59---vopimekizomikixa.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/c7a445735505a99b56f9f9b1f9da471e/pegibo.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/78346669926.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/36040489296.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/ff52c31d09083a461aa3b2b3ed02f569/rijix.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/078d5282a2c9536877ebcee9afd6e8c5/52996314268.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160b77016900a9---24765858618.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1848d8762a---3781395958.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b864adc39a1---ruladamuwilapab.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbd97badd5---kekavigenab.pdfIn PDF document text
    • http://veitali.com/upload/files/66444715963.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608867f32a49a---94425794411.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fd242bd72---71814987093.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/209e7d8fbe79486158ff85a3a70738bf/tosun.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c88e69789b---76383760242.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/jelit.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088eeb264a77---fipegejezowa.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/6nvmugnt7fnnpc2pfflh4pjis1/bipifadapebatibokenuwaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=short+french+stories+with+english+translation+pdfPDF 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_off00010134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10134 18996 bytes
SHA-256: de5e636af2a0f6110fa56bfb2d0bd639b5d29c454ecf499a8d57f2e11b134e1f
font_01_sfnt_off00013252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13252 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A69 11060 bytes
SHA-256: 576ec583272ac213c881642e4f38b7080eae9283335f16841b4939d0209a0a16

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