Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b3fea62acee8572…

MALICIOUS

PDF

78.8 KB Created: 2021-08-26 15:00:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: e4e40943a2297d461bb606ddba6fb068 SHA-1: cf86cd7b5f100231ba8144baeb768472d5d9fec9 SHA-256: 3b3fea62acee8572d06472f6b92c064ba0e9eb5093fb5d7e8e43c9b58db991fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607502550a4f0---190341495.pdf In PDF document text
    • http://abovomedia.hu/_user/file/14863384490.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/7u2r9jl6nnelipl6c5bpehv4j6/869996484.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/99122302635.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/87757816044.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161204d3730c00---gusajapavivifej.pdfIn PDF document text
    • http://dmkert.hu/files/file/18878289686.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/fifor.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210703_981B3613BBA86A81.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/gazoviduvusimixibeteleder.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/gewibowevetarevov.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/4ae4fd587d894baf3ace3b4941f59616/lebofefed.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/00e3073510c772fd454833594996b2b4/4015724816.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/zolijibogirivali.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/rupomebixized.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/86542976012.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/65055762833.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e1c9d2c06---95035816051.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3671548ae---reduvokazubezene.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/74304824228.pdfIn PDF document text
    • https://brs.jo/userfiles/files/kifasutafe.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/6782e5f848d17cabc0d6e67569655206/voliwu.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/22703995451.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=set+for+life+results+tuesdayPDF 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_off0000cfb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB1 10532 bytes
SHA-256: 4c262b264ff43d0d25218f30240c063a7be3c3f143e4a16ffc9cc79f7306ee3d
font_01_sfnt_off0000e7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D0 16696 bytes
SHA-256: 65fdea3825ead148b7c11eebe5ec0a63eff0317d898f3ec68d6b9f4370e0901a
font_02_sfnt_off00011332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11332 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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