Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3e8fc9a070d7767…

MALICIOUS

PDF

110.3 KB Created: 2021-07-31 04:27:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4a298988e4df31769d1b0df3fb2828de SHA-1: 2149707ba7ed34a374cb3ba815aa8f99e0710b0c SHA-256: e3e8fc9a070d7767c8804793fd87db86e2545a02382a2e392cc530eb8f2b3557
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the rationale is based on the heuristics and URL analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608808133f380---nufefejatetunasadifi.pdf In PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb58f800e0---paxexelogarubujur.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2ed1090ed---sumive.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/tafopufitatubumina.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812b73d4b5d---4044091014.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/8f46b8e947adb19efdeb7d2d829471c8/demagawekirajetotozojur.pdfIn PDF document text
    • https://themalc.org/files/file/75498042590.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/176c336b46acbb04f5f767a28ebdd0db/radavetisawome.pdfIn PDF document text
    • http://servmed.net/userfiles/file/gulaloripeli.pdfIn PDF document text
    • http://lyonsmcafeereunion.com/clients/a/ab/ab8eb7fa8d7cf94b91f67e7e346c80ed/File/22652463678.pdfIn PDF document text
    • https://samyenngochoang.com/wp-content/plugins/super-forms/uploads/php/files/i2adh462irpdplpiip2ao18c52/34468103340.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/814f2c540e4d585530ff0785e0587461/16690464111.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/rusawofafobobolodilano.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1e59a1259---fewaluvodesal.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/90339654420.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/ruvotub.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/80a905469a184880fb490b7d84a2a2f6/47239449720.pdfIn PDF document text
    • https://plasy.com/uploads/file/69590167755.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/69029444627.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/99fb17aeb399e2fef2b7314027a0a5f8/70465543966.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/sebufunonigu.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/katewixazaze.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/15693381224.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/a3be1c0e6f65a5e48fe2949ee6d5c725/71494399520.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/4078a69828608ad7c570c700bd331d8f/59965757242.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=soxhlet+extraction+lab+manualPDF 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_off00014c3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C3E 17808 bytes
SHA-256: 6e1c1ac82c0282af6fd90c992b44ba9f205cbc36b502fc0bf709a6003dbbf76b
font_01_sfnt_off00017aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AEE 10744 bytes
SHA-256: 8ca1310e2de85bcfeaa263d4c6c2589e966bc2c1f16384de9a330f18177b18e3
font_02_sfnt_off00019377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19377 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1