Malicious PDF — malware analysis report

Static analysis result for SHA-256 e035431bae2ab233…

MALICIOUS

PDF

81.2 KB Created: 2021-07-19 02:32:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8b9092831bbbb2e733d3ada09fa34012 SHA-1: dae6e2a2b5ee7be6781744f5dff5bb92f1548785 SHA-256: e035431bae2ab233edbb58b88e528564afeaefb7cb3c64faa2525bb6003c54be
156 Risk Score

Malware Insights

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

The PDF was detected as a phishing trojan by ClamAV and flagged by an ML classifier. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads, suggesting an attempt to lure users to malicious content. The document body is unreadable, but the overall structure and URL analysis strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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 http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b284376d79---70068979092.pdf In PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987db456971---poduzer.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/47653145982.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/73932754594.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0d5d7794d---25032523521.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e76038ebd---37970814445.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c40235de4---952590970.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/2f111fba385e4b4389d2a0a464baed96/vuserogilasajamitil.pdfIn PDF document text
    • http://parfumkin.ru/files/files/61258445737.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/pidow.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce398a88dd---jajinuwat.pdfIn PDF document text
    • http://kfbi.ru/content/file/2911551923.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/gegurowojiwijuvawuzijube.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/74143315391.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c9fe7c85057---nilewosawukugepifusikil.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/xamadipeluvid.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/wesovotesazodupidatunud.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/19f06a68a0bcfa0d77b0b8d09dc89158/60648536000.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/vajuxeron.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/21278977630.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/58eaf6e29f79af72e31661c2d85c4051/21569193095.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/guroxakizuvok.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/zudazozexojod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=mike+rowe+seabeesPDF 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_off0000c5eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5EB 16740 bytes
SHA-256: f0cba47e248f9aa3cfed01684205e3f4f247310d8f7813c5299dc381b9573a52
font_01_sfnt_off0000f152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF152 10164 bytes
SHA-256: 97dcdf01c5b162909449a8714126e9fadb7833206b9a44d64f5cdf1d8da41011
font_02_sfnt_off00010856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10856 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12063 5888 bytes
SHA-256: 05b236dff3942ed35cd86b08c2dc9aa02b199d753c5b774a0c6249c9411ec6c2

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