Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cf5129e68a94918…

MALICIOUS

PDF

82.1 KB Created: 2021-09-08 04:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: a5677516b00e46fc1f1d75475bc9c65c SHA-1: 7aaf9a52b213b80698eaae7503f28308bb38b98b SHA-256: 0cf5129e68a949188e1fe65cf9f30c243fc4f55ebbee99ac9304badd302c2948
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://talaa-obour.com/webmisr/uploadwebmisr/file/bapobagit.pdf In PDF document text
    • https://aep-tc.com/cache/fck_files/file/tisutuwemefuxuwuxixokagaz.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/dda0e67113dd40ea301d7c793608a71a/57091937317.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/87946572027.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/rirudokalomaburazegume.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/c74c804114ae1f10cfb4b5b0b2dd66b0/79889810476.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/71965709496.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/42176739971.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e65599c7c5d---mutewokonowan.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/59865440c80da318df5fb0744542696b/8921486621.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/libuku.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/411ec65243867f4ddc4d46c3d6a3175a/fifamud.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/61762576395.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/67438237351.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c34b1f251d9---lujitadip.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/81075676831.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/7279193758.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/90827399173.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/43038899074.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afcbf1b4f3f---pefamulezupuvenipijakedag.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/63569141335.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/xikijofewepipuvuxadegug.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/tezen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=affairscloud+current+affairs+pdf+downloadPDF 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_off0000dac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC7 10780 bytes
SHA-256: 51ada307357ecf8ace437e89ccfe55b0ba10cef4b3692df6708b87325ce9fc88
font_01_sfnt_off0000f3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CA 18148 bytes
SHA-256: a01f2701553befcb6c94cc0cebdb938e71f2efb5d8208c9eb901557f2bacbe2f
font_02_sfnt_off00012291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12291 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1