Malicious PDF — malware analysis report

Static analysis result for SHA-256 55573ac0f05ed13e…

MALICIOUS

PDF

103.6 KB Created: 2021-06-25 23:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 26a2db033e0ccf4738c0616268a1a18a SHA-1: 8d7cde8cf03a5e7c8d4d0b19befb26d6f4bf5448 SHA-256: 55573ac0f05ed13e5e2bc229710ae489085646c4032486e0d119e67ca67e4a98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The primary goal appears to be redirecting users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9737

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://insights3.com/wp-content/plugins/super-forms/uploads/php/files/6806c5d56b7c232eeb09266a8f13bb24/solamunurafokeginofula.pdf
    • http://paliukenas.lt/i/File/sizexowuza.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085cbd5563d0---81634721814.pdf
    • http://hillcresthigh1971.com/clients/9/9f/9fbf9047a6869172a982db6f42f05a9a/File/12238014776.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b72f294df---53970026449.pdf
    • http://wksystems.net/HotelEstimator/userfiles/file/89833812003.pdf
    • http://codienlanhminhquang.com/upload/files/munebakodevojun.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4177bb935---77752771397.pdf
    • https://suativisamsungtaihanoi.net/upload/files/24063987736.pdf
    • http://on-video.com/movies/movie_data/file/wosodabesogodupavivelike.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16089c0367ce82---95389585599.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b35eb71390d---89233992446.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8008f061b---vizagevukuw.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924e8563df6---negevebidakurebe.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46a6f140ce---musabez.pdf
    • https://anmoul.com/userfiles/file/55590687247.pdf
    • http://conelser.hu/fck_uploads/file/surorafilukewijun.pdf
    • https://advance-pack.com/editor_upload/file/dadida.pdf
    • http://webmenuplus.com/images/file/kukeb.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/ivda5igg7vk7tetht2r01k6ldq/tezimozinuwizavuxuvevuva.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccb6475314a---13518237364.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb44f354e0---15891980468.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607539762d567---1527123151.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=my+hero+academia+movie+two+heroes+dubbed
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9d6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D6 16792 bytes
font_01_sfnt_off000111e3.bin
31400208cdc69be8f03e3431d757c412a0266d23eceb7464a5020a4cdabd41e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111E3 7624 bytes
font_02_sfnt_off00012c50.bin
4cd31bb63ef2d44cf0bb3b4d8385b27019cbd6c82b0c4ddc9b8bd71a1b2d0b12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C50 18720 bytes
font_03_sfnt_off00015da3.bin
95183ca921072594e8c26dcd9b4a93a57fee64c5fe65febbe772b320ff0781ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15DA3 10984 bytes
font_04_sfnt_off00017742.bin
680e586a1ee573e661d30ea0f7a97a8805d5b79b2e3d5282e6cd27ea8e1e9edb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17742 16632 bytes

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