Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ad077d70dabb0d6…

MALICIOUS

PDF

78.0 KB Created: 2021-06-25 23:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 858f5feb586115c5aba4df4837315e92 SHA-1: 14d5ced58511c4777a89d33ac248ff27c9047a22 SHA-256: 8ad077d70dabb0d64f41722d947b9e767eb1676b7f5b1e5d3ad3a973126c781c
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which are hosted on domains identified as disposable or potentially compromised. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure suggests a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://suachuabaoduongmaynenkhi.com/img_quanganh/files/sezuwijudirit.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/i0a1lqmrvrrfivkjt9cd4p3mf7/gedomusefuroxosimuze.pdf
    • https://dnmpaint.com/sdcc/images/file/1102096344.pdf
    • http://scandirent-new.ru/uploads/assets/file/67191522795.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714427b0f79---semunamovowere.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cee731d2f---13512636497.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16099c2ef4c451---12006700123.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d5e4bc1aa---juwapiwitowuwepa.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ft9897945u89oepp51htukp5n7/letoditezaginigide.pdf
    • http://robertoantoniz.com/resources/original/file/zavavanoxafirolixogapawe.pdf
    • https://weeb.nu/userfiles/file/vukinojewen.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/7c8f53356a4652fc1d69d5fa09604cb4/53577509430.pdf
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/5d869ca530be2f204e06587820d47938/68732020186.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/a3f2902857675b4a4d0e853379930a8e/6711402862.pdf
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d717f37fc5---rotatozekomafogabota.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/vqv5gu6plubkjg7cv213lodt75/98390544281.pdf
    • https://alshamiltrading.com/alshamilfiles/file/74524934626.pdf
    • http://1960whs.com/clients/7/73/73384dfd0d582a2861cf356c55c3c578/File/25334868101.pdf
    • http://ketoanantamhcm.com/uploads/files/mujadaje.pdf
    • http://mabifitness.it/userfiles/files/13419163475.pdf
    • http://edwardlankin.com/clients/86087/File/10376000737.pdf
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/luguvasitorunipuwakur.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=mary+berry+shortbread+cookies
    • 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_off0000cdab.bin
1e1173f8bc99e209ebb7f4c248e39eb71d9312876c9d1c2f32db37f27b5a5337
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAB 17128 bytes
font_01_sfnt_off0000fa34.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA34 16792 bytes
font_02_sfnt_off0001124b.bin
983c9f306e76caa412675f482d48f03f5270f2e2ea785b572cf0d9b070a4c8ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x1124B 10656 bytes