Malicious PDF — malware analysis report

Static analysis result for SHA-256 c58c609b62b225e5…

MALICIOUS

PDF

94.3 KB Created: 2021-08-10 23:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 176208c64d069c50276c29104ce5e103 SHA-1: 49874b662a02e69d1b3dcc3dcd3634087c333bad SHA-256: c58c609b62b225e554c195b32775d5503f483ad50033e5495e60e4b4c61b0e34
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, which host further PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of numerous links on potentially compromised infrastructure suggests an attempt to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d567682bf---1477259492.pdf In PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/niratozu.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/morinimi.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/f5c38596d8008996cefe68f3aa3fd559/foxakarakoxopovikunibaku.pdfIn PDF document text
    • http://hiddenroots.org/clients/19739/File/voxobixa.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f3d74ca5f57---naperijapurizuxepimi.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b78873524d7---55501846869.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/95879531946.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608358d915f3c---63423033163.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160829daa36281---lujimep.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/97568387788.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/xogaxisiremulejiki.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/sewasubapagifasodow.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/vinofufosuz.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160f4c42fe7200---xejoja.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/3168034198.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805f1e72dbb---98018993077.pdfIn PDF document text
    • http://whatdwellswithin.com/file/64772952521.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/xamororo.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/f4b1065543fe55700dfee49fce01574a/dajajuw.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/74226d8ea3c5790aecd6c9f1281a2c33/57396574238.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160997f14cdb11---3787128676.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/fikemole.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=kobalt+miter+saw+stand+manual+kms-s16PDF 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_off000105b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B4 11072 bytes
SHA-256: f4de87aeaa675e2a85a2857ac939838ad0a737a3a758127dd8fe74a1eda8e33f
font_01_sfnt_off00011fa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA2 18540 bytes
SHA-256: 647ee8354765c222969b43758a902eaedb83820736e9c1c0419c250f35d96464
font_02_sfnt_off000150c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1