Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9c5e1cedda53c43…

MALICIOUS

PDF

74.7 KB Created: 2021-09-06 09:25:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5ae6e5e66c98f9bfcdef7ee2a7b4b2e8 SHA-1: a1f61f59c5984c0760786ffb84ef2d7bf293f4e9 SHA-256: b9c5e1cedda53c43705ab54bafe70045372168de32bf401d7fd24ab31d3e7fc8
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to websites that appear to be part of a link farm, with some hosted on compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to direct users to phishing or malware-hosting sites. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://nuovartea.eu/userfiles/files/semorevimakuxotatilivuf.pdf In PDF document text
    • http://kwong-cheong.com/userfiles/25732133257.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf8df27d243---vukemekaxivimavepafo.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/29807738743.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/pefoke.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/54419676071.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/90537719952.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/85405993012.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/5fd06e0795f7381a6b97a3ad051f18d9/diporenajez.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/26426149264.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/fubes.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/37444150413.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16126fb0155858---buvuwelag.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/vagepudasevoxewesokevap.pdfIn PDF document text
    • https://businesslife.com/content/files/28758388871.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/g9pnurbneu8vhr7vblmebvt5g0/94074306185.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1e1806b63f---faragexizoxamemekupokik.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/90495160191.pdfIn PDF document text
    • http://waberry1969.com/clients/877040/File/zozozobitanagorutufimip.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/490272b8495ae4ff71ded1a2bda3f33c/7512313059.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/2f92cc9ffb20b8c5564406a61b8e18ce/22201650678.pdfIn PDF document text
    • http://netpost.vn/upload/userfiles/files/43687505244.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/50a894cb29aa337847c8db9c361e0d8f/2781252533.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=pdf+book+downloader+appPDF 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_off0000c327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC327 10452 bytes
SHA-256: d638863427685321a34055e5165d32a65fd633c5035ef3c4aa715491c9fd24e2
font_01_sfnt_off0000dad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EA 16660 bytes
SHA-256: a0f71a19ef2e9898c5f607a1976542e4e85f040ec86a80b2bfdf4ceab7da85b7