Malicious PDF — malware analysis report

Static analysis result for SHA-256 463f1e3ea09b2e1c…

MALICIOUS

PDF

87.3 KB Created: 2021-09-06 15:15:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7b22e6bfc9569a24caae34dbd6f7d9cd SHA-1: 8228a620e2448741ba9724f55bc80d0dfc50a42b SHA-256: 463f1e3ea09b2e1cea66eabe1e416856b4b637e960522a5a6554729552ba375b
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis reveals it functions as a link farm, containing numerous external URIs pointing to various domains. Several of these links lead to PDFs hosted on compromised WordPress sites or disposable domains, suggesting an attempt to lure users to phishing or malware-hosting pages. No scripts were extracted, but the presence of multiple external links and the ClamAV detection strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4047

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.
  • 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
  • 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://chcial.ru/uplcv?utm_term=union+budget+2019+speech+pdf PDF link annotation
    • https://almondzwealth.com/administrator/imagetemp/file/laxex.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a96d8ed0c30---jizuvo.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/xivagefi.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2c9e89206---vunanepi.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/gologexanisekuf.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/83658678344.pdfIn PDF document text
    • http://stlukesmn.org/clients/17773/File/davuxe.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-7-16/20210716021608492931.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1624367199.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a401caa7bab---fetetixikimezi.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/55621393076.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/pifevivaserodasewifaxoti.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/kutizowil.pdfIn PDF document text
    • http://kietminhrivet.com/upload/files/lakupekat.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/kixafisejedaxaw.pdfIn PDF document text
    • http://namhunglogistic.vn/site/files/gamazafigokes.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a37ddf2362---midorikiro.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/38580821886.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/gotokigodutuviwidulil.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/62126259478.pdfIn PDF document text
    • http://anpharma.net/upload/files/10089015200.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/99782422234.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CD 18428 bytes
SHA-256: f4a9c891da55f32870d9825f790d1f038dc9c04020ff877eb532ca8690ae7224
font_01_sfnt_off0001310c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1310C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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