Malicious PDF — malware analysis report

Static analysis result for SHA-256 3363315fbff8f9c2…

MALICIOUS

PDF

72.6 KB Created: 2021-09-15 11:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 62efa2cc5b7a85048e4b6e1bdc9b2142 SHA-1: 4643a6e32e50a3b43c7ca9427acba900009d7bc9 SHA-256: 3363315fbff8f9c2d4ec75046c1bf0dbcfbbbf633dc873512dbc70c5130b3478
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f7579c563---86363751655.pdf In PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/pebinomutuz.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/raputumakenixugimi.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16132dc0aa87be---19190512674.pdfIn PDF document text
    • http://anindecor.pl/files/file/25857961044.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/22147715764.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/67607d4f5389cdcb9108133fe1375d31.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/vamege.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es/ckfinder/userfiles/files/babubijugivawowiloju.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c994c92f0---kebegegojigoguzido.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/migapiraduko.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210914060847.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/95815240027.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/xaronop.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/09/09/9675170281.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161324cc9d346c---koduvuzosekukeboj.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/65649555715.pdfIn PDF document text
    • https://comfort8889.com/upload/files/51351798360.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/30245109776.pdfIn PDF document text
    • http://chapelguild.com/images/usr/56863574374.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=a+to+z+screen+recorder+downloadPDF 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_off0000ba6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA6B 16456 bytes
SHA-256: c2ab800628be55ec8d7916ba86d31edcdf5323637cc370f6c72489c8f028828f
font_01_sfnt_off0000e4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F0 10396 bytes
SHA-256: 38a69adef5b753668ef877f1b2d0c4a75cf7988cb67a142682662713842e3cbb
font_02_sfnt_off0000fcc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1