Malicious PDF — malware analysis report

Static analysis result for SHA-256 fad55cff87497509…

MALICIOUS

PDF

87.1 KB Created: 2021-09-20 08:32:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d3d6918613375a6a1fb2cd7e5fdbe46f SHA-1: 00d55e4bccbb594222d9828198b5e6127fb7b0b7 SHA-256: fad55cff87497509ca607aebd9100023705f3537ab804e441cb83cf53dcb98db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting. The presence of multiple external URIs and link farm heuristics strongly suggests an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://inwebjor.ru/uplcv?utm_term=picai+smart+ai+camera PDF link annotation
    • https://rlmahtani.com/userfiles/files/22013962208.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1182ca32b---zesavevo.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210917050044_Z2VkYWtpamFnYWxheHV3dQ==.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/79398e7cbeeedf3d8098e577a39f312b/52261148287.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/lupowojabifejesen.pdfIn PDF document text
    • http://metamorfozyayincilik.com/userfiles/file/dilorufetexiwaj.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/75982191813.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/83828490711.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec315c6476---mefujobafuvaxixewulad.pdfIn PDF document text
    • http://singlesync.com/userfiles/file/23180109478.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/17911694890.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/98070924179.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/fiveduvirokijubed.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1631357526.pdfIn PDF document text
    • https://premium-house.uz/images/file/80753079040.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/noropibijab.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/roroxilesetopobubi.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/satamar.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/90555091046.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/nidixoja.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/zadasobukukijexubi.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/dapowozudidukav.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/3aed03d118a68c7f8f2084a90ba6e152/nikipet.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/kabiduwe.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147d0bc49d04---70371124153.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/nuriruzeton.pdfIn PDF document text
    • 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_off0000ecee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEE 10120 bytes
SHA-256: 4048f75c87aec9e0fbc75e44c16720fc5267ad4511c25b0650691e7947a4071b
font_01_sfnt_off0001038e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038E 19096 bytes
SHA-256: 2c2761ebf274d01b49c7271045a917376115f7c261baf6bcfb9bbad3c02ad4ed
font_02_sfnt_off00013632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13632 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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