Malicious PDF — malware analysis report

Static analysis result for SHA-256 11303adcdeccea90…

MALICIOUS

PDF

106.6 KB Created: 2021-09-02 03:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 14491785aa992c121f035b0b58254f9b SHA-1: 72e5f0a9eaef4097119b92a2466718476a5fe5e6 SHA-256: 11303adcdeccea9068a3d4051ef820213a553c65bf0b69b2d3890c2a283e3b74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via embedded URLs. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://crewmak.ru/uplcv?utm_term=how+is+hell+described+in+paradise+lost PDF link annotation
    • http://zigzagontwerp.nl/sites/default/files/file/86156541119.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/1987994776.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb8be52b7c---demuxaxowosamamuni.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/ff20vfh47sboai67hibq5jbva8/watizo.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/fojapamomugatabaraj.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aca2265541f---refotajufeba.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/12518194790.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/80901575238.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/kepima.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/94713784527.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/24763363935.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/63207742535.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/31376299305.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bc31bd5295e---15996087560.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/simetupukidesimodo.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/wojagasedu.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074acbb7e3c7---89617948303.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/2a76b75b9281947c4ce7b18d6d3abd95/tukalubijuvowufatapipura.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160c13d1d0ad29---ritigajipegokirekimoxo.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/3pr5f6m93tas5djm3uaih24hl7/midim.pdfIn PDF document text
    • http://sharise.net/Uploadfiles/files/55770150065.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/92895564053.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/f29a6b3fd2b69e28d48e736cbf339c88/38212726284.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_off00013b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15383 10828 bytes
SHA-256: b14c1bac0cbd4586bd80fc7685a2dfd85314034d1893375cfb46d6e7933d887c
font_02_sfnt_off00016c34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C34 18692 bytes
SHA-256: 55333da710b1e12d045ec96aee4eab2f0c6b0705329b20375a7a473e439482b5

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