Malicious PDF — malware analysis report

Static analysis result for SHA-256 6df41e823f5a25e0…

MALICIOUS

PDF

92.9 KB Created: 2021-08-03 13:36:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4b10af8f0b529bf1443df91612e1df05 SHA-1: 583a99a359345fff94cf1e6b4cb1541e51f1b8c6 SHA-256: 6df41e823f5a25e0a04ebae5036f3fdb2da54acd715211385107457b14ce63ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous links pointing to compromised WordPress sites, likely serving as a link farm to distribute further malicious content. The file's structure and the presence of external URIs suggest an attempt to redirect users to malicious sites, potentially for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://infrive.ru/uplcv?utm_term=anatomia+e+fisiologia+do+parto+pdf PDF link annotation
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f85472047b---niduges.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/ea6fa426cf3ccc72747b2cf557247dae/46243776592.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160718afba679e---kibenuv.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/dipurefetubutojupu.pdfIn PDF document text
    • https://sieseam.org/userfiles/files/bimanetuvese.pdfIn PDF document text
    • https://naoshima-habitant.com/mefezojunilizisinaxitot.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16099e86a85428---supigur.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/nv35nb8b5j93v0mvnm24ekvnc2/84983263781.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/6c179c1b2641c486e313ecb54d4f0ecf/fovovidepiz.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7465bb55b---fapuwap.pdfIn PDF document text
    • http://ctm.it/userfiles/file/50528744288.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be7eaf3dedf---sidekinubebof.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/zutegewa.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/lufuwibaxen.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607298cc322b9---vaduwimejikalufimo.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16070064303546---24939548138.pdfIn PDF document text
    • http://samtle.net/ckupload/files/nuvoxa.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/giwajar.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/lid3iad6m3q2n8ld6jeqho9epg/327306402.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16080ac47a9bde---37665051678.pdfIn PDF document text
    • https://armenia4d.com/contents//files/levazezogesemuwis.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/83763605396.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/diwopupopolel.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/96064398550.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/ece9c2d5b77eef308af80f9cbeb448b0/redonefesakefekojuz.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/1981dfbff95891080dba16923e2727cc/sezotunal.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073a40da9fd5---40716988096.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_off000102a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A5 19304 bytes
SHA-256: 63f5e8a36e938108761d5836d6676cf5e3c288e2130e2824112b1e64e775aedd
font_01_sfnt_off00013280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13280 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A97 10820 bytes
SHA-256: 9dd011b6c14bc573923716289c6a8d9d1bee58737a5d19fe2862709831f32ec0

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