Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e5580d853af2eb3…

MALICIOUS

PDF

89.8 KB Created: 2021-07-05 00:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a2ce730825e6fd1b502201988a172498 SHA-1: cb4900816593f2c657f5d082220d1bdbd9c726dc SHA-256: 1e5580d853af2eb39152ecb9927bd2936b4ec65dffc154b9a13d3213e819875f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to lure users to download potentially malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://palakkadtourism.in/ckfinder/userfiles/files/80826487744.pdf In PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/5f6de227c567ae1db7859fda3514ceab/mogajodelizi.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/96704151093.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cb2cb1bec---6603887726.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/80d271418560772e3ff48492d1aeccde/nimupuxojuliwawune.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1606f423e3cd82---6988433485.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/378890e10f131f1b9e97481a9c308925/78406992109.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/c8cd348049320e96c60266fb447a0b8a/burupi.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/f71e8791cc81af65ed07397a74a3818d/webajow.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/c1f91a5bca33b25d2ce7866ea47173f7/81308384345.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/rh5t9rfmipis3obpv64ttm30r3/91535010518.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/6a2a22ca9a60c6951822046b6cf61423/sozesalor.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160985e5c05fdc---sebuterase.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dc0a39e17e9---64881097011.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/90571784826.pdfIn PDF document text
    • http://kotolantopeni.cz/file/busorevirenarifema.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae1036f9d3---nugibojozu.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/95279683586.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b7ee193f7---88768062905.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/42971641084.pdfIn PDF document text
    • http://titusrelay.com/clients/e/ef/ef304ccc03541e9e6382bef5f13b0a7d/File/16764748519.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/7d4333498033904cd962bb08bd45251c/66636372936.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54415e1074---82534457730.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/d7bueinpkna2g6lc1tf5mnoden/41768932205.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a75cf6dd16f---bagefepil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=download+game+ppsspp+guitar+heroPDF 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_off0000f88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001109c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109C 18236 bytes
SHA-256: 19c94aa9b465a7f04d832ec38ea12eeb318ccaa07807343e8ef29b732859f5a8
font_02_sfnt_off0001405c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1405C 11024 bytes
SHA-256: 153f1ebcb3c48ef75036c47313f26f5817212ef82d4117510a754bfa819a4acc