Malicious PDF — malware analysis report

Static analysis result for SHA-256 41ae3cfb049acf0f…

MALICIOUS

PDF

85.1 KB Created: 2021-06-25 23:55:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 26039ac27e46593a6addf923b5dfa0b8 SHA-1: 5b83473f940c61ea9b19af9b75a02538b830d28f SHA-256: 41ae3cfb049acf0ffd47c1c46d1cdafa8c9b76bd813d7890951c277d4be42592
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/f4a06225b8ffc6765d8bc1e79ff29029/12185276232.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16079de686f72f---45874216823.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85ab4d5585---vizifupexaruzikid.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160819fd01fba1---86047104923.pdf
    • https://arte-salon.ru/upload_picture/12438968583.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16083a3239e4f9---60308529947.pdf
    • http://cleanyachts.it/writable/public/userfiles/file/peleviw.pdf
    • http://www.nomorcantikspesial.com/file/wosuvagar.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2924048391---zinokaxibek.pdf
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/64383055468.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160711ebb20cf1---nijeluwivabidejedutovotuj.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/96f33c86bcb937831749d9295f9c0ddf/fawanoduzeniwoxoboko.pdf
    • https://stradatextiles.com/upload/ckfinder/files/75372407928.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/jmkaor3o84k5ggqbbgah3ag66q/82169372520.pdf
    • https://n-zvuk.ru/upload/file/63570721151.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2fe17779c---nesonudezoda.pdf
    • http://fructusartis.com/i/File/84137781060.pdf
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/sofar.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa09ee9311c---47381008972.pdf
    • https://arch.ua/ckfinder/userfiles/files/40583884323.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b47f1c241---16830360147.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f00b13e960---88242184295.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16077512d2ac99---wuwokapome.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a1e4ef576---lasaxotefili.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=edge+of+tomorrow+tamil+dubbed+movie+download
    • 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_off0000e82e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE82E 16792 bytes
font_01_sfnt_off00010045.bin
3a2398fb6c96720c87c27fe82024167a2f191628480a9edab3ad20db10e19b0f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10045 10904 bytes
font_02_sfnt_off0001194a.bin
addc3254d37f787c64c39d3fce8dc5005e1e3156cd4c43997116b3baf8755add
pdf-font-stream PDF embedded font (sfnt) at offset 0x1194A 17260 bytes