Malicious PDF — malware analysis report

Static analysis result for SHA-256 b477b96ac6bd6703…

MALICIOUS

PDF

95.2 KB Created: 2021-08-09 09:06:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e8d8b81dc39036c2d1ce629a390e5f20 SHA-1: 1b988488b04752592ef66e916d0081237ce37ef0 SHA-256: b477b96ac6bd6703deceb0d7907ba4efa8be14f74a7b141dc19e0cdb4b6cb28d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The presence of a link farm on disposable hosting further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ff2ec03ba---9625503416.pdf In PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/af09866d89025165c6290214fe866b6e/wolafegosijexazoz.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210719_065325.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/30460574147.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/52099094202.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d8c76b787---88067635721.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/ratilifipuja.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/3079660038.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/18880b9817c62b3c7283751b9613355b/53118652139.pdfIn PDF document text
    • https://orsolyajuhasz.com/ckfinder/userfiles/files/71973299307.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/41367487ed8ea3eda31cd591dcd202fc/88411839362.pdfIn PDF document text
    • https://fultoys.com/userfiles/30792215164.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072337e30c8f---jafuzavobatisu.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/76388381954.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/durunebidetepuvuxigiw.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/19636622044.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607131f66b8b8---44359334836.pdfIn PDF document text
    • https://argumentua.com/i/file/51436584506.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/6263ed89c1eb4443b87590a0c3cdb08d/891983572.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/31494660453.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a63fa182ee---titibegafugi.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/midurololedexikidifomi.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xixasuwuzuxa.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ca8ba6cc7---wirurejusibutexuzilipew.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/19970212051.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/8fa3f01aa45a48d77af6681c5e740d70/75198733666.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=larry+wheels+bodybuilding+program+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_off00010eff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFF 11244 bytes
SHA-256: 6f3225474a73206f00aff2b42c9d68fd2ea56223207139fb9f02930cc6c0932f
font_01_sfnt_off000128be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BE 17420 bytes
SHA-256: b525c99e6a314e170b02de351679167de7e461a46068d2b961becd49e8016ffd
font_02_sfnt_off0001565c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1565C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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