Malicious PDF — malware analysis report

Static analysis result for SHA-256 d216ebf51a57b1b8…

MALICIOUS

PDF

63.7 KB Created: 2021-06-23 05:11:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 0436cd288fd5ae12ea978fa07d81ab4f SHA-1: 880f7e26ea0ef8b46dd42e6dbbbcc57b7310caef SHA-256: d216ebf51a57b1b8f862c4ffe50e79bb7380e684440d7bd2697c3cec8a4b32b2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It functions as a link farm, presenting numerous URLs that likely lead to malicious content or phishing sites. The presence of external URI heuristics and link farm indicators strongly suggests its purpose is to redirect users to compromised or disposable hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9519

Heuristics 5

  • 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
  • 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://smidgel.ru/uplcv?utm_term=piaggio+zip+50+manual+pdf PDF link annotation
    • http://feldbach-tourismus.at/files/zafafoponofigonuremoze.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3486940e19---nagesekarajid.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160940cf255011---wipisunexupubozob.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072234c14a02---deluvevabaxulaw.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160b055e6213dd---finoteratutalobebixosamov.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/54845342789.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/vp3d7nj3bj2t6uel3uthnkiht3/baredu.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/6269215608.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/42635208267c38e222963e87f448459b/judepasameruv.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab59c37333---renidiwipixoperij.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/1326f9f6827bde0b8aaa981bd4dfa867/wofutekofilidugitanax.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/968u280usqbkks6l5p4e2sgn16/69474642925.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160bd727a8867b---24775393836.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/17442483809.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5ab616b8e---geten.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB723 5404 bytes
SHA-256: ee055b3d23a9cf4769b1817b1036e86d7eac73b6fab753611715247e6c593eac
font_01_sfnt_off0000c988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC988 11852 bytes
SHA-256: 893175aa1512162bdfacbb89459102e683c90e27cc61984f2c2ce71ddf826340

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