Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ec1d2fd7576d9fb…

MALICIOUS

PDF

93.5 KB Created: 2021-07-30 08:35:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: eeb0db22d2a5d33fdc475b918b051556 SHA-1: 8b8d1c6611033633a424fcdd483020d1c727434c SHA-256: 4ec1d2fd7576d9fb620ca96ea81c6dfae97f2f32f80287755cf93124dc6f9a4d
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Several heuristics point to the document being a link farm, with numerous URLs embedded within it, many hosted on compromised or disposable domains. These links likely lead to phishing sites or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://easyliveconstruction.com/ci/userfiles/files/68484230941.pdf In PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/7fbca3d5f7d0e4c2a7e3cc1b8abd1038/topezavitunukigotikopufex.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/47881621518.pdfIn PDF document text
    • http://suapaiatuipelehakefamily.com/clients/80707/File/botiri.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16097935fd0a01---82232327434.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/gurugosuta.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/6770070770.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/veganojexepemi.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/v7hvocr8u0lokfgsv5m48k6pg2/31293003286.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/nepikalilukomu.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/92044196504.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/turukod.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/59108722490.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/01acc7e0a4308b420c9d9b3a8553b497/tovovikisokananuj.pdfIn PDF document text
    • https://noddy.nu/images/file/65564890726.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/burovevofivowef.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2j9hl68q2s2a0li22ee4ldojj0/18738083265.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16083eb552e466---46918071685.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/63257597025.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a373fa9dd82---45062360507.pdfIn PDF document text
    • http://sneedfamilyct.com/clients/44919/File/vimitozowomorawokimu.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fca387dbdd---kumuregobozolowir.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/suzitafubefefokesilop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=sb+game+hacker+apk+no+rootPDF 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_off00010ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000122ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EC 17240 bytes
SHA-256: 05f684b9e5771fd09fe57d29c4ea8ee17603d09054e0afb517593ca4398e05c6
font_02_sfnt_off00014fa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FA9 10824 bytes
SHA-256: a61c6f54939a3e706cef8ea7da253c640c447a393fb95225a11791da28652a3e