Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cbe7669e3c3ba36…

MALICIOUS

PDF

89.4 KB Created: 2021-07-15 09:38:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 170869650940b676bf448cc122f4bee4 SHA-1: 94fd3c95dcd4cdcdfb9856e4260ca9d07ea93f0e SHA-256: 1cbe7669e3c3ba36d383c8236ca4c23da68b2f2f2dbfbcbd651d913a5a7ba10f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other potentially malicious sites. The PDF structure and embedded URLs suggest it's designed to exploit user trust, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16083bb694afff---60867579115.pdf In PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085950aebb0a---lubegozoropipevedo.pdfIn PDF document text
    • http://1960whs.com/clients/7/73/73384dfd0d582a2861cf356c55c3c578/File/losetajanuximadazaso.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/86619397211.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c650d88a2a---monusujixav.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/roxinitidufesarod.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/3e2d453c20128404ecd774efb5be750b/97190197939.pdfIn PDF document text
    • http://bangkoksolarpower.com/syner_upload/images/files/95392572645.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/93040729957.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/38831166936.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a36294dd44---37669591703.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/sanakodubojobusijoxumus.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16075dcdc05616---wajizagi.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/45445472137.pdfIn PDF document text
    • http://amdind.com/userfiles/file/65225264024.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/e019c26a7270b9b289ce4bfb3ec239d5/5166093929.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/436674fc17e79074620361e7bf947819/refixowanumasupusu.pdfIn PDF document text
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/sixusivejonetetixo.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/pevasuzevosir.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/38127865795.pdfIn PDF document text
    • https://pasarangroup1.com/contents//files/2665163520.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/dopinepegatunerimojubun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=period+5+days+late+spotting+and+crampingPDF 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_off0000f977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF977 16604 bytes
SHA-256: 25480098354d79fe40851b6fa2e39b67bd5e2381c08274a4c6c0602c41a19abf
font_01_sfnt_off000124b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC9 11104 bytes
SHA-256: 5156c64b9a6f815a63ea7d57fc4ec5090d4f149c60c9be8dea1370db58c09245

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