Malicious PDF — malware analysis report

Static analysis result for SHA-256 0913101a3bf715bd…

MALICIOUS

PDF

83.4 KB Created: 2021-09-08 06:19:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d8cc46241893cd44bfb05915ce37eff1 SHA-1: 5d8356284ae7e3ad6b68a2b4dc1c3d1f02d5b3ff SHA-256: 0913101a3bf715bdaa7b0943722071606036878e77bb0e4e02dba2cdf52cdd20
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues about its purpose beyond the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9149bb5a13---52251187024.pdf In PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/10mtvd4b6vrq1ni947h41ljqe4/pewoxibutepezotenebakiwud.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/d6b7be2f787cd7ec964bc9a4b146a7c9/8736954683.pdfIn PDF document text
    • https://masukpt2.com/contents//files/46736355996.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/23961463679.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/79489681052.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/wiresubivazowekasagudix.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/d4cc21fd6baf8b20beedbf5400ba7330/11877282769.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed0750afc6---62282183274.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/18528315157.pdfIn PDF document text
    • https://red-adlay.com/upload/files/bamawuviweli.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/ocf1ka19ve3qg4ab010u763elg/67176786077.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f87bc19609---92359462362.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9df6861af---7137398639.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/pamozulupamoru.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/045c4bcc1576d0a4096606c1b81094e1/lizewot.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/53393306475.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b332ec14b5c---75813023641.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/44300380524.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/zojedipofafepezo.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ba5da3c9d---siruwanezazidadugejavaz.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-3/20210903195701801264.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc008bfdbb---getamiwi.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/151ae8759b80d58e7a7b2b76e44e899c/fugelixanesenowubulasa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=ejemplo+de+acta+constitutiva+sociedad+anonima+pdfPDF 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_off0000de4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF660 18624 bytes
SHA-256: f701d773a250f9ab320a7b2be14f906e26a1778c4cee3650b8f09660af031cd2
font_02_sfnt_off000125db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DB 10960 bytes
SHA-256: 6806c2e7a50cdb802d3954bb0a3a02eda55efc11654cfe0966fd06d84274323a

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