Malicious PDF — malware analysis report

Static analysis result for SHA-256 57d4da4039949d77…

MALICIOUS

PDF

81.5 KB Created: 2021-09-02 00:33:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 68682fdaf6a9f20170625662c19f50dd SHA-1: 6d14868a40301ddae30a8839e3b8afda5ac1a6a8 SHA-256: 57d4da4039949d7710f674d05be4245b74a4c4848369a384f1aa3994a0e5f708
156 Risk Score

Malware Insights

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

The file is a malicious PDF detected by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The primary attack pattern involves directing users to external URLs, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://oniceh.ru/uplcv?utm_term=how+long+does+cash+app+instant+transfer+take PDF link annotation
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c52c69b2142---puwidariliragitanegazo.pdfIn PDF document text
    • http://mutitar.com/user_img/files/nitozib.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/walixasedefoxaw.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160774a2998918---37575939236.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/fenubivafuvufiretevuro.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/0f00505b0a586a42d80751269358e9c7/82528205160.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/jd2nq562chdnm22mohnudagb1c/pawonosuw.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/31700311059.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/12371576590.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-8-14/20210814194224692753.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f33e19af3c1---76820993557.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/37ba9d7f823747c01ab2e0a9761d9912/piwusovuniposorimaw.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/vibisif.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/134134f2952d9430a4ccef2ae1a8120b/wefeboda.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd78a50cbb9---35830495843.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/52534335835.pdfIn PDF document text
    • http://foxadv.net/file/16400398008.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/ea3e370236c4fa3e012d88ce64e0d0f2/58797907929.pdfIn PDF document text
    • https://promise-land.com/upload/file/rewoxalozimapapuwefa.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/motuk.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/kenasowotejo.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160886b5e4818b---53384929648.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f11415f4d---zifavemulososibufogu.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/moronewitotabiva.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/3162138136.pdfIn PDF document text
    • 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_off0000da27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF239 16788 bytes
SHA-256: 698ba80a4a3cd7278e767d99ba56c029069fa006d7ba3266983956b7acf02ad2
font_02_sfnt_off00011d9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9D 11068 bytes
SHA-256: 80b191439e699f539d88abd38834003ba7f396e93e9da7d244dcdd524ec72043

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