Malicious PDF — malware analysis report

Static analysis result for SHA-256 e137bc557416061c…

MALICIOUS

PDF

94.7 KB Created: 2021-07-06 03:31:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 83274c49137636004463d7a07b3466e6 SHA-1: 848edc7318334cccd96d04d558600a3fa4cd02f2 SHA-256: e137bc557416061cabcecdedc4a602160489f1338b90ef7d769f321515e9fc7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://archism.ru/uplcv?utm_term=class+7+science+chapter+acid+base+and+salt
    • http://70sromans.com/clients/871711/File/12142698079.pdf
    • http://rkmaster.ru/uploads/files/22387876942.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c297fae97a2---suxukanabukigiwekug.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e6d54783d---ziweveki.pdf
    • http://ankamet.com/userfiles/file/zinameguzonenoso.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/tmp/navagib.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dabde61015d---62709463285.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/a22a75baf32ae869bdbea601e209b9f5/sodegavevafoxikopogo.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/btujfjficrni8hsr7plgbl662l/23795893835.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609157a08c2c1---rapudisexini.pdf
    • https://roweryelectra.eu/app/webroot/uploads/file/16212586009854.pdf
    • https://pearproperties.in/userfiles/file/23260357494.pdf
    • http://homeopathyhongkong.org/files/65457956979.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16085b0eb62384---wozilo.pdf
    • http://isgsrl.it/images/file/73867180967.pdf
    • http://soles2walk.cz/data/file/numovu.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/7eie7fsojq6g3k0s0ra0nhdth1/wawot.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160765537b0c63---70001336576.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070eea0d12f4---47865203849.pdf
    • https://securitegenerale.tn/userfiles/file/lisafiruzevuxun.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607f972bdea80---47339364858.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001111d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1111D 16792 bytes
font_01_sfnt_off00012934.bin
6b7e1f2dd10c39c1566a8bee7a248f1a58400a489b417bca690e06d5bf1aefe1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12934 10712 bytes
font_02_sfnt_off00014188.bin
d2942fb46d225495d387f883511e31a0a281cba1e3bf26dd57eba409a46c65bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x14188 17060 bytes