Malicious PDF — malware analysis report

Static analysis result for SHA-256 eac26809075eab42…

MALICIOUS

PDF

85.5 KB Created: 2021-09-01 14:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: f7fd3565717b28cf8c93c1110ff2c260 SHA-1: 656f6538d6fcde78a401e58eabe8c79d4477ea1b SHA-256: eac26809075eab424c013ca60640fe245f5a5eecfc70e273a2e4c58241cb6d2c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple disposable hosting domains, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://studiopiergentili.it/userfiles/files/13955118408.pdf In PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d222dea859---dolin.pdfIn PDF document text
    • http://sapaelitehotel.com/webroot/img/files/joxerekezolewamesisemuve.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/1160973321.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160efd5c1000d5---wipawisomu.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f3c1757db---90699153176.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/16052422362.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/xegurutizasem.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/zaxazazajabozavisedewun.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0ed17f569---xilakujulemofiso.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/7j1vppqfoqb82rs0ldkd656p39/34677162740.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/zepaxozivovibaxez.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/tarogijiluweserud.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106210104.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160850cec878b0---80874017195.pdfIn PDF document text
    • http://autoservizimensi.it/images/fck/file/lizaxevogisalilexikinoka.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/xenavewuwisedizoza.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609831cdad2f2---jadabizobufuwetadidekofor.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bfccbc182ad---zuwoxemezepozoderu.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9bc3bb461---foxefulix.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/lv1fk1a1po583f0pnbs7a2tcgo/notexiwesel.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/ul8tu5ft7v1jh148rd8j798885/majobage.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/15497489516.pdfIn PDF document text
    • http://hoigolfbinhthuan.com/users/files/kakitowizot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=cfot+exam+questions+and+answers+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_off0000e853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE853 11076 bytes
SHA-256: af081545124676e5b6e33bd5115b0e25bb0afedf1937696fadeb09e89bc0f9e2
font_01_sfnt_off00010204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10204 17872 bytes
SHA-256: d605d38cc4cebc91419a399523c061d4ac7ee67b57cada91e91288d3f7c3be91
font_02_sfnt_off000130b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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