Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a21ab5437a3295…

MALICIOUS

PDF

136.8 KB Created: 2021-06-29 08:41:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 3adad3f4726c593f60954b101345ab86 SHA-1: b66b81df6055a32bb67242c2323dcc00f23b5e84 SHA-256: 87a21ab5437a3295a60c848989d81b9ff0dcd384cb8737e20ed034020168ecec
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to domains associated with compromised WordPress uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9781

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 https://twr1115.net/files/fckeditor/file/9556583145.pdf In PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be31d74a8bd---kisuzuli.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16085d7ddbd9e9---guwegadogovumidowe.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a308c7303b3---nateto.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/6422df5337bf7ea69f69f3104d9efefc/mokazawiborigimalusu.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/24488071227.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/c08563b40ad0ebe61f23dbb0569163e6/regolijomeferisepikani.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/432fc74e3905c792fce1e0ce5e597f6b/wojosewoli.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/jowibepojaxif.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac84ec6078c---muxitoful.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609ee38a9c323---94379727844.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/voraj.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f2676b2ae---84123751337.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce7dc0d3029---69475783731.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/vogubabolujuvufut.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/63206168190.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/28/file/20210528_014403_156.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54b83d5cfd---70576216484.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ceaae2222186056e0c8e156b74577418/87180225305.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3280ba9fd---fakidok.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/movidukilo.pdfIn PDF document text
    • https://actorconseil.com/files/file/64111946455.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/99095312199.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=what+is+singapore%27s+national+languagePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A531 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001bd48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD48 10656 bytes
SHA-256: a07726deb31a2e2b60a4e0be58aa3719ab6d5fcb0f13a048ac4c21ee730556bf
font_02_sfnt_off0001d5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D5B1 19112 bytes
SHA-256: 0801835d31c90a4346c1770d69dee95b0492dca92fdc1909f85f9b6a65f0190b
font_03_sfnt_off00020775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20775 3508 bytes
SHA-256: 68645baef37782b8e0ee81cf06781be983e7a8dfec99522eacd7cf76c18b5520

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