Malicious PDF — malware analysis report

Static analysis result for SHA-256 9140de8e388cbe2d…

MALICIOUS

PDF

272.8 KB Created: 2021-07-09 11:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 4fddc61977a3cfee21fdeb542ed0be42 SHA-1: 3ce71d3b89df2b2d89f1c71675c95e6c4b0063ab SHA-256: 9140de8e388cbe2d45513b7bd956304d5e221d1b2ec9afa1c18f82d04138c0e2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the compromised CMS upload links point towards a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 5

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=collecting+memories+classic+wow PDF link annotation
    • http://autowagon.it/userfiles/files/fazinekojoruvi.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/xuloloxuzeleton.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c257e101a---pozux.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16096d0b4ec088---66256939972.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbd41c6e81---63730445725.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/64865654087.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afd6fc77d8e---ninanaxisikenugetajoxotom.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/kikivavoseguzipewizuno.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/64265681052.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/55769888487.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607880b11303c---97666804170.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4365581af---69821847189.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4461200370---nokikevuzojizaxobalifoxom.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825be51a1c7---91960443468.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/vuzadajolujere.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/xijodetiwumemixozinaf.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/45alo8p1jo5tk1juo0edncqa9q/59435025117.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/49672391529.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a50395473c---18649890377.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/295721baa02037f4a24a3d0614ad797e/rodoxaxixafi.pdfIn PDF document text
    • https://avenue102.com/uploads/file/99617192400.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092abcf3ff85---fojopesulab.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16089f60456478---56201905202.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/da4087f09f50de4f2e1bd76f1eb9cf88/mukatilobimovipejinupori.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_off0003d69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3D69D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0003eeb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3EEB4 10692 bytes
SHA-256: 17f53710e18b0814613d68a5670144543f4e9fb75a908d0bb2f926ca8c014344
font_02_sfnt_off00040746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x40746 17536 bytes
SHA-256: 673be2120bc26a65ffb5c95bd5104a9ae2517a643dce3084ab8a6d13dd2c4838

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