Malicious PDF — malware analysis report

Static analysis result for SHA-256 20a847052b920e02…

MALICIOUS

PDF

83.7 KB Created: 2021-09-11 21:31:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 84d53b7179f21917e20b061c3a17f7ef SHA-1: 74f61ab213ff86072420c77bc563751eee09b605 SHA-256: 20a847052b920e022033812b38aa89f6c909ee7b8c3b8953c95d74632a8e7b96
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The presence of external URIs and the overall structure suggest an attempt to exploit users through deceptive links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://riverla.vn/uploads/userfiles/file/4037974597.pdf In PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aed248c698---99795196980.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/85907466891.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/lufoverubokikeseze.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/ed9780aeb1310a17e340786227381208/zifuvu.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/74463217137.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/44e431509e5ae9fdec41ea819c4388c1/kosubunekinavezitudiwusap.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/55589861677.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/57475387347.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3421c4a8f---33115661565.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/nl1t6tm1hu30holfegn5224c5l/parenojenusutupuwizi.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16134138e202fd---82336089618.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/26839387979.pdfIn PDF document text
    • http://craft-personal.de/userfiles/file/71812169555.pdfIn PDF document text
    • http://zerosquareonline.com/file/82916523924.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/sosijatorixusavaxezubamo.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/nijawepubepan.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/99897185604.pdfIn PDF document text
    • https://safecampus.in/cmsCart/upload/file/datal.pdfIn PDF document text
    • http://irfanmakina.com/depo/sayfaresim/file/jukivogajubaginoso.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/xizobizevexugigipajibifub.pdfIn PDF document text
    • http://floramarble.com/uploads/fagogofumijub.pdfIn PDF document text
    • http://intertravel.hu/_user/file/71781219536.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/27467015945.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=apk+free+tricks+snack+videoPDF 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_off0000def9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF9 10704 bytes
SHA-256: f29301d7902f3767b13da2bb4a0d193704c028b83643731874733917dbb1f021
font_01_sfnt_off0000f7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C1 18756 bytes
SHA-256: 9585e472952704f3f0021b753210316eefd1dd695e5b60a2bae26ce41b6db00d
font_02_sfnt_off0001291e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1