Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b035321a1fb15d6…

MALICIOUS

PDF

70.3 KB Created: 2021-09-13 11:21:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6fa41394d812a4c2187ca9dc977f9968 SHA-1: 8789417113078d2f4411248d7ccb1cf86d809d3a SHA-256: 3b035321a1fb15d62c8b30a1bed089ba98c138538e9f30d1864b9def30364778
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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.scea.edu.mn/ckfinder/userfiles/files/venizaforemuduvotuvuw.pdf In PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16132b0d93e452---vuxosidomemobilutiriwe.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/72899496985.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/33273475322.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/vulupowefazuno.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/49637859693.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210910124256_forge5.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/99102747836.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210906021748.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/59027208972.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16137c3209a282---wibenuwisidejer.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/tabasoluralaludixal.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/39153366407.pdfIn PDF document text
    • http://carmakers.cz/userfiles/files/rekawuxevegur.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109100422476422.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/bizemozogivoluvilize.pdfIn PDF document text
    • http://candientu24h.vn/webroot/img/files/rejuresapozetu.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/judafe.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/gedelidijigafijulew.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/mudugurukoxegebez.pdfIn PDF document text
    • https://srsatta.com/ckfinder/userfiles/files/16947849506.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021912165285259.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/84376103412.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/lozibijaxovejabef.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b66f64fcd2---tigomipadixorixared.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+transfer+android+dataPDF link annotation
    • http://forum-auto.ru/data/files/69557366084.pdfIn PDF document text
    • 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_off0000b6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6AB 14708 bytes
SHA-256: d7d2ce527ae005e30dfc8031bfe6558a392bff4aa0033b22d667849e8591b092
font_01_sfnt_off0000dbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCB 10380 bytes
SHA-256: 5cb4e7312988d1851ff25f69a931eefcb3fb91419aa85df2946e117987d4de7e
font_02_sfnt_off0000f36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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