Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc1466618935d450…

MALICIOUS

PDF

84.1 KB Created: 2021-09-20 22:12:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2693ee140d665bb96833f552e3fe41cd SHA-1: eb33276dfce9092092cb9451f77dcbeb516a018f SHA-256: fc1466618935d450616653ac2d840fbb594acd886ffba84ab04fd697351679f7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this phishing or malware distribution intent. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://medvor.ru/uplcv?utm_term=how+can+i+stop+ads+from+appearing+on+my+phone PDF link annotation
    • https://hijaulumut.com/contents/files/pevixekare.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/0fe1ad23279f7c970dcbe4c6968f0517/8794884248.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/65386852731.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/bozakurefakafogexolasol.pdfIn PDF document text
    • http://hla.vn/upload/files/79913408272.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/xutimozegifesanoti.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/natowarojajunelilode.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/fafimaluxajar.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/zijudokuxarutelidibinezu.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/15677842805.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/ueqkhi787dkbgqbsmd7l7pdkuv/67740122961.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/xaxemapopib.pdfIn PDF document text
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/gufazadus.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/tapagobebisudoza.pdfIn PDF document text
    • https://vonia.mikludava.lt/images/files/xapopujotagilavo.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/wibajozefewevufovoxubawe.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/48959792407.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16146b561e7e38---xafururezalol.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/xowetamuxu.pdfIn PDF document text
    • http://amandamaitland.com/images/file/67242550054.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/kuzogokus.pdfIn PDF document text
    • https://solturism.ro/images/file/fozubujisedixalo.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_off0000dc7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF494 11212 bytes
SHA-256: 5f0d0f502ba7aa6a8df53cec52fbb9b112f4278e28a69254f5418409bd632355
font_02_sfnt_off00010e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E81 19840 bytes
SHA-256: de5a0b1c3beffaf716dfab2834984f004bb1f7fbe09dcbebac5a16144cfe2784