Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba539665727006fc…

MALICIOUS

PDF

85.7 KB Created: 2021-09-12 01:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 215d7d800dd14e3fa9029d6c667b0ca0 SHA-1: 33368cad5b446aa5c37608903498a4844967feb8 SHA-256: ba539665727006fc6e38e8d358e938d50ac0743651ecae6b82c72202d2a1f1c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/5dc12425263e9dc3cf51a2e44f6b6a98/35508808583.pdf In PDF document text
    • http://unitez.net/images/newtech/files/60828664221.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210903184956.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/28097553241.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/66202060854.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/67007196676.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/kukejifujeta.pdfIn PDF document text
    • https://signos.larrialdiak.es/files/galeria/files/weriva.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16137100be8f30---rivuredivefiwanazotorovab.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/bokofizabunizoloj.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/jovekafo.pdfIn PDF document text
    • https://premiersuli.hu/files/files/fejobidarosukuxigu.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/4214044419.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/zilixawixebaripojupoga.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/lokomebizivof.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/3nja9mhnqmgtemvtbqg440lfu8/solifobowit.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/zamuxizalalubofunoz.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/wavabebevugo.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353fdb4ad0b---xadakazozamataxolumu.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161330e90decf4---kenovosigumamulisatifabuk.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/1b352217960fd557a21b686ea5847117/fofimilugonusuzafub.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/jutunumapedaneputus.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/xogexozonanu.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/rupup.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/42712179371.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/68880942982.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/darerelagatexelul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=samsung+s21+ultra+live+wallpaper+apkPDF 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_off0000e811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE811 11068 bytes
SHA-256: d16be5f83997131457d3aab8915f7bd43a64437b08c56a2f46721d1779c97c18
font_01_sfnt_off000101ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FE 18020 bytes
SHA-256: a188257b5eb8d5f80405675d0ecac6bec648163b03369d01745c29eb424c6e37

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