Malicious PDF — malware analysis report

Static analysis result for SHA-256 484d4f5b0988fc3a…

MALICIOUS

PDF

81.6 KB Created: 2021-09-04 03:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 105562ecd2138c5d367862183c0fadaf SHA-1: 0bf25a6dd63bcce5a957d6ded130852048e9d16c SHA-256: 484d4f5b0988fc3aff1ae9fa72d846ed5eb9d76ae555b38dba513d0f2a4cfd7c
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm hosted on compromised CMS uploads, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly support its malicious nature. While no scripts were extracted, the presence of numerous external links, many pointing to potentially compromised or disposable hosting, suggests the document's primary purpose is to drive traffic to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077028ee5f89---tomenesa.pdf In PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/85a0657df7ba820d4eb5e6d2afb2bf37/15199490814.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/83655410000.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/34195897094.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/70rbrdacv08s48gcmrm114ulhs/43543573988.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/felepipozuxagoves.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/pukazurexibuw.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c692e17ccc0---widofora.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/a1efb26ecf6c1675f66a82bb37f60578/towonujeki.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/xivoladowerirog.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/71693203286.pdfIn PDF document text
    • http://edwardnugent.com/userfiles/files/7596483916.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1624066109.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a316e4e7072---xezanibugomugekulumodavi.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/r963b4hfi7apsutvn10ej89en4/buvolekagabiwabuxulipisur.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210720181422.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/86625991154.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/87170135114.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/lonasifopif.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/benevekajigi.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zugojedinuxuwupimizisi.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/jurilolebukusobatu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=nrg+mp+c3003+manualPDF 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_off0000dae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE0 10480 bytes
SHA-256: 87136e1d327b551d25bb44dae77bcae1f691e04973075e24b54bea10d1b80a3a
font_01_sfnt_off0000f2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A3 17840 bytes
SHA-256: 62882c8c2e90c7dd8d7a39588712c12218394d1f2bcc4c886f3d8b2a10230664
font_02_sfnt_off0001211f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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