Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fc58dc28925a900…

MALICIOUS

PDF

82.5 KB Created: 2021-09-21 15:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8d70c0b84ccd9869712360bc91287daf SHA-1: c3a85f761e69a4b360055ee0cba6ba4958d83e45 SHA-256: 7fc58dc28925a900fa7a028639715ff5c2bef68f8e19e8c0ab15413d2de5a637
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external links, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=pubg+mobile+india+in+playstore PDF link annotation
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/xitomipisaguk.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/21404090973.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/wilokimipixunujivikili.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/nakuk.pdfIn PDF document text
    • http://faradbox.pl/files/file/gikapafuvizejel.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/83887318292.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/papibotuvolizaziji.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/3db966733671e5204e1d3c562bf68a9f/66429505190.pdfIn PDF document text
    • https://soechi.com/userfiles/file/wixomofafaxutogunifad.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/vaxabiwiworatovugiv.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/21838623939.pdfIn PDF document text
    • http://hk-keber.de/images/file/migibabi.pdfIn PDF document text
    • http://gabortech.com/admin/file/paxemasuboporup.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/7824093569.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146a81585794---58222369130.pdfIn PDF document text
    • https://aneri12.eu/res/file/xasubagokipoputimukugujep.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/2453c90dc6d84fa06a698fa6dc8f2e53/kusirorutezuritavuwilepas.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/13721614485.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/12454896520.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/rojazinataga.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/20658039809.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/10582986251.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/munuj.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/zodovamez.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_off0000d9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E2 11088 bytes
SHA-256: e422a658ad5255dc405301f17c2d3119df96e39b55b29e0e7088e0c893823353
font_01_sfnt_off0000f34c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5E 18964 bytes
SHA-256: 7d70406a1e9e7eedd959264babe3060ee77358af1fe7e358b6b29792b002620c

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