Malicious PDF — malware analysis report

Static analysis result for SHA-256 109bbcd2140143cc…

MALICIOUS

PDF

88.0 KB Created: 2021-08-11 10:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 972efc7aa25cbe5a6065660dcc4abdd2 SHA-1: b5f2b86c251ee4c6228caf2c35c12b87f50a99f5 SHA-256: 109bbcd2140143cc98ce4381aa6091c5049569e63e07fb4c4e4139d0e04b3251
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to multiple compromised WordPress sites and other domains, suggesting an attempt to lure users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cz-synergy.cz/data/file/52763413705.pdf In PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/723d15e580e7140d9997ec57f814fe9b/68721637529.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/51b5708fa6ce3afe8639503893dee31e/89776325258.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed032987f94---libiboliwetugak.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/ntthsrl2tre4uqmmhlr6tnaik4/29483761121.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/f4d4a7d0a6ba540ff031ac3f7eb06fe9/61853321599.pdfIn PDF document text
    • http://blatt-gruen.ch/files/rawuw.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/takasitesabazowu.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/nedelifajadiwajoxej.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/38205987773.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/36524644487.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/14612987821.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/giwoposanofewib.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89277dee33---zoxiruderowesuveganiwezo.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/rivomipitag.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/piu5eucmjsm015e87puh7pd71d/59380426031.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/76368488383.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/matufusa.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/tit0mcioje821lqa8cgjg2j572/74614485400.pdfIn PDF document text
    • http://abwva.com/uploads/files/zigebetujutajadogavunuga.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/55c076af28ea61e51a361fe4dbc52e8d/xepexamerovezugoteligeme.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/dogopudukobig.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/9bd9cf138469ad4de4056e450eeaed4a/werugekixadijixudalido.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=can+you+put+music+on+ipod+nano+without+itunesPDF 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_off0000f324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF324 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3B 10964 bytes
SHA-256: f6458907316bc8236618aede2fd82e3fef964041b320d340cfc5ef2ef240504f
font_02_sfnt_off0001249f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249F 16992 bytes
SHA-256: 682ce792a30480b2f97ee006e91e6d8ea4322d07bafb5dd75d92e3e132468d67

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