Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdc3ccbb7a0fb69e…

MALICIOUS

PDF

74.6 KB Created: 2021-09-04 15:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0d02a201f5d5de45621fa933f6555bf1 SHA-1: 5b858efe300827022a556abae793982eb7d8bc9f SHA-256: bdc3ccbb7a0fb69e24048e0c3715be59a2599d9767b3b6bf654ef92beb38beee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites and disposable hosting domains, likely for phishing or malware distribution. The presence of numerous external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=define+data+collection+methods+pdf PDF link annotation
    • https://bmw-zona.ru/uploads/file/tukowijatumu.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/d272878bd0d835bf96f9382a4f85b34f/ziwafutimazesuz.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/66936962089.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a48e00199---xubexejuxumugezajewov.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beca2c8c7db---68466451042.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/xapawirukeburititox.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/linamitinujikemu.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82e0ebd31f---jenozano.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/27455463063.pdfIn PDF document text
    • https://belloverde.net/emailer/file/vunovon.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d261a76966---13512762714.pdfIn PDF document text
    • http://takemehometomatoes.com/ckfinder/userfiles/files/79243028740.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/91669568650.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/jakemowibo.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/i4a5j0trtchrar71vdvi8bcdg1/punazoti.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/26068165164.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bepitewixiwaregaw.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/sawavakiteviketitiror.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/vunikonokufutesidirun.pdfIn PDF document text
    • http://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/tudesoj.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/maxejevulubavovamabet.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/113a5ce6a361eeada89dd66888adebeb/mamoturabupu.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/2515978278.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/mifitedomefiwopesegib.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_off0000c58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC58A 15204 bytes
SHA-256: febf094c21072541392a5e6ea7ca772ad9230c34f995f0da5217d8d5e4983175
font_01_sfnt_off0000ebd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EE 10784 bytes
SHA-256: 1b81ddbd0ef4d88bb36f4287d474d7b4ed7cbe03327bc7522d30c4e072e36c67

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