Malicious PDF — malware analysis report

Static analysis result for SHA-256 50cfb01df379086e…

MALICIOUS

PDF

78.1 KB Created: 2021-07-04 06:20:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0cb89501bb37ef9a0c2a1dccdc5a5dc1 SHA-1: 1fd30b6309598fa3396ced76727431bc0d1a2b6b SHA-256: 50cfb01df379086e1c1865a9dcc24f6cf1ecc7f78ebb9b404f4bd23b414dd6eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous URLs that point to potentially compromised websites, likely intended to lure users into downloading further malicious content or engaging in phishing activities. No scripts were extracted, but the structure suggests it's designed to exploit user trust through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bca2c4a3c---pilejapoxilofigomit.pdf In PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/27313597267.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/f5247a6e3baa917a93202e0924e991eb/30378434111.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b45bb887b---1365156738.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f3641697c---fezibeniderelexu.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/wutadazafes.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/ccfe11b204853afe68690c765545de20/39675158573.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/d0711497f5536eef0fff83673b3f5992/veritatapukipomazo.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/wovepasuforukosono.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160778917353b8---kebapexuzasuledumil.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/59198131470.pdfIn PDF document text
    • http://aimic.com/userfiles/file/fibilis.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210519035523.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/nuzoxumatuxuzujedufepajug.pdfIn PDF document text
    • https://koratspring.com/upload/file/99633540076.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/5276417c8c2abdc00a70a42c5c807db6/liligofevojujep.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6376ab6c10---darisokefikoxavo.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/43636185544.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/tijakexojavaki.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8db828fad---65626011454.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/38355626966.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c4bf408d5---mejimimavubolatukoz.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/zijuximamuropuk.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/vrpk3a7r49hc902mromh3om536/80054624677.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/tkmimud286d92j8s88v1okbbp7/79007193901.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=24+dollars+in+poundsPDF 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_off0000d0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A1 10356 bytes
SHA-256: ca8f00f21fef136c06ad4becf46571ac673b889c4ffd09aa44bb399bf3113e08
font_01_sfnt_off0000e815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE815 16448 bytes
SHA-256: 90194b01708239769c03f3fd81bd9a66e6603edbfa97e1356d8e8e1ccf68e230
font_02_sfnt_off000112fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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