Malicious PDF — malware analysis report

Static analysis result for SHA-256 4751e5b185aa1e4d…

MALICIOUS

PDF

73.1 KB Created: 2021-08-17 00:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 8d1d72db8505d80b3a8555aee9608d71 SHA-1: 9cb1979b80d46ed09351d792d61361a8f8f8d6bb SHA-256: 4751e5b185aa1e4d694c4d9db240374cb30ad4014bf5c08fd4f65cc9c5e9021b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites and other domains, forming a link farm. These links likely serve to redirect users to malicious content or phishing pages, a common tactic for initial access via spearphishing attachments.

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 http://smartvoicecom.com/userfiles/jexekofawixabaxokibor.pdf In PDF document text
    • http://vinhthuan.com/upload/files/vujazuraxixep.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/cd61b754c9a98c107f2095aff0633be9/rixesija.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/f8c52833a8d4529d1612c0497be29eb8/3419663424.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/aq07uha70gl0jpbsbggh106u7l/zofonubobele.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/xesuzaxixudufudisiwo.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/f8e420b20b16cc89df58f857fd63ba8f/rutubeduzujapijideni.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/kurukevogabuwuwedojeno.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/sikak.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/30495566095.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/b81dd23977282789ef51df9095d0acd3/9131296081.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/vuguduxumofi.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/25065987961.pdfIn PDF document text
    • http://apricomm.com/userData/board/file/53572478263.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/h1njtelk2klkbqd09vobe1i44l/sulekulavafivifiz.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609842d1588d8---tirukodemikakobi.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/weduwinatabatuvisiv.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/67547163954.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/66abb6eb125ece779af2489388ddfde6/20725850903.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jagalibijef.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210615_077C1B9D8F5D3C2B.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/mexisekuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=algebra+1+common+core+holt+mcdougal+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_off0000b906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB906 16556 bytes
SHA-256: 5ac2d0cc7b89e845da23b2a912d039a756ce3a74aaf2aa26169c3712be6b2def
font_01_sfnt_off0000e3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0C 11080 bytes
SHA-256: a444ea47c13679e20b08f696f0fa0aca203991dd6c2fa0d8fd1f5ecaa30d550f

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