Malicious PDF — malware analysis report

Static analysis result for SHA-256 9124e53aa438cf8f…

MALICIOUS

PDF

81.9 KB Created: 2021-08-23 15:35:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b83d94e13dda139c218677eeaa632867 SHA-1: 4f3bd66d6d1f4d975178938e9a9d05c5459861e2 SHA-256: 9124e53aa438cf8f8b8ae0678048efd8ae63d189322130679416b7cd5902a034
164 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which host further PDF files, suggesting a link farm designed to distribute malicious content. The presence of a 'download button' heuristic further supports a lure-based attack pattern. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=apk+link+play+store PDF link annotation
    • http://capital96.com/userfiles/file/34994158509.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/88302384306.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/61464061156.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/rapobuk.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/9bcec3989f13b3ab7392a7ef83c099c3/vubobagidatipivudul.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16099d10be8907---sujofowodex.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/39065884719.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/240450d934b29a811feb384e115f9337/2668576553.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075769009b36---litolibipilo.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/defedekedo.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611ebd2d6f843---57251175476.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5aedd79202---41108505168.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/48761381839.pdfIn PDF document text
    • http://hochrainer-elsner.at/upload/files/65009758117.pdfIn PDF document text
    • https://shibbirs.com/media/files/77433044845.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/luwiwepalikezewev.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/bagolebubijexa.pdfIn PDF document text
    • http://linker-apps.com/files/7548168059.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/tasawopibegitup.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/1mrl6716a1e08m7ibp9and6n06/72958833434.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/61438842280.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/bosuzixige.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae3cfc348f---99579026874.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210619055556.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160900a2ad77ce---paxovuxorofob.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_off0000dcc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D7 10432 bytes
SHA-256: 9c547d6b5dcb0ad96a0f659eba95e1696419f21c5ea45bdfd1a7fed866de35ec
font_02_sfnt_off00010cb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB3 16720 bytes
SHA-256: f78f503b36314f0327f9c92fd9a2e15d442daebaee8422d8ebd37065e08e1232

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