Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1d0ab4ed7f60242…

MALICIOUS

PDF

91.5 KB Created: 2021-07-13 10:07:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8a18559931227db498129b1c5baf408a SHA-1: 51507c2fbc6c527836ad5c84c7367f1176418802 SHA-256: a1d0ab4ed7f60242e4e143bd6e3b568ac9c573128031c814c29de93a9a5f9ebb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload directories and other potentially malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to phishing or malware hosting sites, aligning with T1566.001 (Spearphishing Attachment) as a likely initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

Heuristics 6

  • 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.
  • 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://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/02ccf1afb3d4a61dd93e30bc5f6de238/18633368366.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16099c950a4300---17268934165.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1608153d9183b4---12652480828.pdf
    • http://appletechsolutions.com/userfiles/file/vusiledoxam.pdf
    • https://tort-art.ru/userfiles/file/26840775774.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160b65d2807edc---13060478846.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/1dfad7c2389b58edf8970067f57aa12f/taxemukeminuforu.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/5fdfdc8127df43a8ee30d9a79557fcad/46907146109.pdf
    • https://jambukuning.com/contents//files/21779527750.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/1a818030a72fa86cb0a5a160e1edc331/90982475173.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b07babec483---zizomusudanikitudagamin.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/bf72abac41a96888664acc304314a25a/bolixudan.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/415aaf8c3bbd4b1a9dd0faf311b5d223/dusixewujoluzamotos.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16094bece40ba3---nigonelagivutatub.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96bcbe05ef---gipapevedijaziwunopunelon.pdf
    • http://plncse.hu/php_data/file/34312137673.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/lgp48g7gmkie67v6f76fral8ja/3755680785.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/3a8b52a2f3802f7c6cceddcb88cffc25/40590669728.pdf
    • http://ngor2-3.com/file_media/file_image/file/kavizixu.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3b278ac29---34716254789.pdf
    • http://sl-light.ru/design/img/upload/file/bureleludiwukurekogira.pdf
    • https://ajansnigde.com/resimler/files/lunidemazu.pdf
    • https://gyandeepjkss.org/userfiles/file/15239527771.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086670880db3---66805478113.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8cff686134---92600968129.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=andrew+carnegie+foundation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001044f.bin
a515e20352093d010259eaaee21f59fa046fbfb03b8d597b87d7b3d908f9527a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1044F 10604 bytes
font_01_sfnt_off00011c8c.bin
33ba0cde452494a0f11fd2979b3cafb449eeb099acb7d250dd9485b28ff3353b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8C 16892 bytes
font_02_sfnt_off0001488c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1488C 16792 bytes

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