Malicious PDF — malware analysis report

Static analysis result for SHA-256 edb02365718a1c6f…

MALICIOUS

PDF

73.7 KB Created: 2021-09-03 02:41:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9fddfa5af210e51e942762eb30dd37c3 SHA-1: 0df9f3571de1edf9f0c77bbfb91e5cbabcf22300 SHA-256: edb02365718a1c6f28f1e7897502352859b429f255d91da9ed9d944d4f77f875
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and a link farm heuristic points towards an attempt to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://doanhnghiepvietnam.org/img_duhoc/files/dutubamituduxasimalofi.pdf In PDF document text
    • https://venus-forever.com/image/files/kovefusowinixozigefasevo.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/9695388070.pdfIn PDF document text
    • https://subarini.ro/mm/file/51758305419.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/85fee1995a5be61db2892b19a928c55a/bebixadokirozakelinogetew.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/91862176323.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/parafimadofotiwawonur.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/39cd967c1e11bd4e1d686908ee35284c/59372336495.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/65351905779.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160faca852f3af---13985561025.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6f7b9670b---kofafifajilawuxifu.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/bejugiwivafa.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/55796753171.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608228e71a940---92139744256.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/naviduvivus.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/33241183539.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/5316d5877997d8a7a4655c930da7e508/gatigefaso.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/f3227b0cb42afccefd909270bd6ffa8b/60645732955.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/37add89adfa5d87868f60cada1937998/65511169237.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085443ad13fb---47597904477.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/roroxisixuruzedu.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/23342448900.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=author%27s+purpose+entertain+persuade+inform+worksheetsPDF 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_off0000bba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBA4 17208 bytes
SHA-256: 231e0fd5c337342487256effee052ecb078019fc4862c1cf3f16513b087eaa7d
font_01_sfnt_off0000e7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD8 11012 bytes
SHA-256: d5cd09284a142ce5528aae2558c97c1c4233495bc982bb01b6f0250beba8b2c2

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