Malicious PDF — malware analysis report

Static analysis result for SHA-256 53701bb9fd346c40…

MALICIOUS

PDF

68.3 KB Created: 2021-09-28 10:14:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eba9cc1ab273e7deb8b7f523d0a8ec52 SHA-1: e8bd45086d082e3bc18aee3cd0df8b771f3b551d SHA-256: 53701bb9fd346c400e3a490094ee41eae52344f9ce989ddf8f1ac1c1ecc6c139
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF document was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. Heuristics identified the document as a link farm utilizing compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple embedded URLs, many pointing to unknown or potentially compromised sites, supports this phishing and redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161472adf6dfeb---ruvukodezefaxa.pdf In PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/supibuxi.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/bonebadubiv.pdfIn PDF document text
    • https://tsegypt.com/file/21971574731.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/bumefi.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdb015f2a2---wubawefanap.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/sewifawijeferurinenusumuj.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/914ba11e634b335cf518daa836b398c9/75433386625.pdfIn PDF document text
    • http://onlinevay.com/upload/files/90282409142.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/vogeguxepogajoja.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/misurabasub.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/77266771741.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/35497075578.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16144756c9ff07---30037387772.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/najikekabajiraj.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/73933720207.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/84tof70ufa99vb5d4vt398bl2k/jusodekoge.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a606887e56---67598025681.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/gmqbtnujosqeio03be5ub98qal/97123699548.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/rugadosiwese.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/kezepurabapinukeporotev.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/83009652737.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/rajedafipobutodaku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=can+you+use+siri+on+androidPDF 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_off0000aee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F7 10340 bytes
SHA-256: 9a26bb5ad6008eff80a418f55168e1a5d4c575cfa035bbb1f83fb073c0c40f40
font_02_sfnt_off0000de75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE75 14828 bytes
SHA-256: 5f3966ce996d2d235ff37867bf2fe043f089b05d7e1f9fedf1d199f7276d70ff

Open this report in the interactive analyzer, or submit your own file for analysis.