Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cd6282333ed8a13…

MALICIOUS

PDF

77.2 KB Created: 2021-09-08 14:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 28835172ff0c20ed672c2950b63e3564 SHA-1: cd976e0a1907cc905cb9937e8877082c51aee56e SHA-256: 5cd6282333ed8a130130d43ead11930fb36504d245df8126933274676948fd1e
156 Risk Score

Malware Insights

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

The sample is a PDF file that 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. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613237ec5fa4f---31945145067.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/5no1papqc17doh276bddgrbgsn/ponukidopukasekif.pdf
    • http://aliguoriarchitetto.eu/userfiles/files/34852682555.pdf
    • http://toflight.mobi/attachment/ckeditor/files/03fac702973396821775a71c3d19607f.pdf
    • http://n3ss.ro/ckfinder/userfiles/files/mefodek.pdf
    • http://xn--z92bzy85x.com/userData/board/file/39316742308.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/a4pqa94ovs6g6joj39cmkiqo96/mesan.pdf
    • https://saigonservices.vn/images/uploads/files/34693123859.pdf
    • http://ellenia3.eu/userfiles/files/zofugibagijadivi.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/79aab0c2dac311f471b828454fc1dd19/16112668997.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/161319d11de09e---ginuvetawibumatovu.pdf
    • http://k-souz.com/userfiles/file/76346859848.pdf
    • http://nguyenhungstone.com/uploads/image/files/zewaruzufu.pdf
    • https://superpackeg.com/userfiles/file/71806027262.pdf
    • https://himalmanpower.com/ckfinder/userfiles/files/wafebajamul.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16138789ca5514---wefapamew.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161359799dfca4---40590476886.pdf
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/debeniwubidujixojaf.pdf
    • http://nensi.si/upload/file/fefonutogemetiwoz.pdf
    • https://robindayne.com/ckfinder/userfiles/files/56534937599.pdf
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/nesimobinavu.pdf
    • http://onlinemidias.com/ckfinder/userfiles/files/49891187585.pdf
    • http://redemaisfarma.com/userfiles/file/67348226665.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=antibiogram+interpretation+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c77a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC77A 16792 bytes
font_01_sfnt_off0000df91.bin
6b914ad5c433f7b522b393a179641d161e100d69646206849fc3015488da5a0b
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF91 10748 bytes
font_02_sfnt_off0000f7dc.bin
dad84f60fe854faf2dbab388fa6970deae59973cd5998afa081435f330f043e2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DC 18464 bytes