Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9ba265bd6473cf4…

MALICIOUS

PDF

74.2 KB Created: 2021-09-21 09:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d28a3ed14a4c4eda47fc6c24a6d31b06 SHA-1: d8a56a533bc5c42e4ed1ce728f7b76572061ebd7 SHA-256: d9ba265bd6473cf4e8742ac1def4d63292b074f4fe8ff74009a3e3345f1dd056
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on disposable domains or compromised CMS uploads, indicating a link farm or redirection strategy. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://bda.ch/ckfinder/userfiles/files/43040100882.pdf In PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161334fc46a1aa---xotiditawumijalabuxat.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16146ab807d32a---31086233933.pdfIn PDF document text
    • https://ctyhoanongangiang.com/userfiles/file/sibatazebunudaxibuw.pdfIn PDF document text
    • https://citytrafik.nu/images/file/99386932982.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/90414822060.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/18868046788.pdfIn PDF document text
    • http://snft.ro/media/file/90576929738.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/14519832404.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/subunemadekogeditix.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/roverira.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/63302365560.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/mobosufejegolexitatixag.pdfIn PDF document text
    • http://aa-nusd.jp/47608571071.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/vidufekod.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/1211779162.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/gidobokerufefasiv.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323fb60bd5b---62615380184.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/92364016607.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/98779190700.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/edde121f60c077c7c1f970b3f493be36/97965173269.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/ad220108dae67dce9c5c7ecf88c7a9bf/52833356430.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/95904441053.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/24380086926.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/nuzefunozo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=paired+data+testPDF 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_off0000be69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE69 9972 bytes
SHA-256: 849cb44f45678543a12622a97bacd4f44d4669eba3d356ec0708f07df7428712
font_01_sfnt_off0000d497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD497 17764 bytes
SHA-256: e393f043102c78596e33a05437f1822c91c85ddb8133dcceeba5beb30748488b
font_02_sfnt_off0001033f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1