Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b49ba612c0a3287…

MALICIOUS

PDF

84.2 KB Created: 2021-09-19 18:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: c3eff58fb4ba5734a29d7c1651f6ed9d SHA-1: 63465d72468d616d117debb375146bfd5b20775e SHA-256: 1b49ba612c0a328707132e3dd86555e8cba9f470bf807c50f60b15340ee40667
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains heuristics indicating a password-protected archive lure. The document body, though obfuscated, suggests it is generated by wkhtmltopdf, a tool often used to create PDFs from web content. The presence of numerous URLs pointing to compromised or disposable hosting, combined with the 'SE_PASSWORD_ARCHIVE_LURE' heuristic, strongly suggests a phishing or social engineering attack aimed at tricking users into downloading a password-protected payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://crysiq.ru/uplcv?utm_term=alerta+falso+de+v%C3%ADrus+durante+navega%C3%A7%C3%A3o+android PDF link annotation
    • https://comfort8889.com/upload/files/xajopogudixawidugi.pdfIn PDF document text
    • https://eurotig.ro/file/99916545903.pdfIn PDF document text
    • https://szpital-sulecin.pl/images/fckfiles/file/dofuvakeb.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/218fb1fe901bee44630197a4872e502b/zosejovubadisogevev.pdfIn PDF document text
    • http://hausdergesundheit.net/userfiles/files/fenomanuwiso.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/lanajiz.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/gusepo.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/jukiwap.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/rupopibure.pdfIn PDF document text
    • https://isosklo.cz/uploads/39082322203.pdfIn PDF document text
    • http://hasomedia.com/userfiles/file/sedabusewag.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4affad9fe---zekabapekos.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/cfaa868e4c63fee15cd7df00ecba2960/lafibobelekiduri.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/nugasivipifazobulumugifox.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/d142b9bb8ef5ff9b73f4a3c791b72d98/73331338926.pdfIn PDF document text
    • https://cubic.is/userfiles/file/64289423064.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/55726232405.pdfIn PDF document text
    • http://entrackintl.com/uploads/87045435399.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/839954cca7080f0a72dd583626c3e072/2676193315.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/wutubagasidekubovej.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/11474997601.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/b4u3l6q2usfoa2ri0leps6c8bo/8159144963.pdfIn PDF document text
    • https://computerzone.pk/file/guwano.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///28142368311.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_off0000dec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC5 19156 bytes
SHA-256: a40034e0d235b3505d39a3d63f81715dfc0e4febbce17eb13fd00a669ca2f255
font_01_sfnt_off00010e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001266f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266F 11204 bytes
SHA-256: f6739e9e58f89fb98845b032afeb5376261c83395a729d9073f4e54a02900411

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