Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bfd15e33e33b6a1…

MALICIOUS

PDF

85.3 KB Created: 2021-09-02 00:18:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 7a566c8c76940b30eac68b5dfa789a6b SHA-1: 6546728343e16c5ba0aa3bf932f9eec031832cd4 SHA-256: 2bfd15e33e33b6a1a3cb30fc48e0339e5830deb0a416b260e45be626c93ef0ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple external domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF structure itself does not contain readable content, but the presence of numerous external links is a strong indicator of malicious intent, likely to facilitate phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/92521256754.pdf In PDF document text
    • http://onishi-kyosendo.jp/archive/15537067957.pdfIn PDF document text
    • https://citytrafik.nu/images/file/92413138820.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1629887333.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/fomupiran.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160b287eb2ae0f---dasutonapaxemelupuw.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f0761e521bb---senuwegus.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/xijojoposokazusaxiko.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/12035777659.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/luvulotabokefuk.pdfIn PDF document text
    • https://menu2uplus.com/images/file/pizijepik.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8057097b07---sipuxe.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/l60sc86egebubgbj8nqv6aela5/gobonawevewolaga.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/51325588437.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/68144673244.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/nuramiworogaparozajunad.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/22032317722.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/0a2102b16c84f255ac962187ff57dd85/foguxulakuvatedajir.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c98c635df8f---71383892705.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/kupupukamipobubexalitug.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/e5010f58176c44368433dd56fd279c03/93561396477.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/ltn8si3dml0m700tsopsajmlq6/mosipotufibejerugon.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/244f50589d679fdabdd3675179786382/rimevuxaluk.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/parafelelamatudipin.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/32355859408.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=guest+lecture+topics+for+computer+sciencePDF 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_off0000e59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59D 10620 bytes
SHA-256: faab4dfe9596d4543c29802fc5e8d770b6f904aa1b1f0350e2e2cdd387201ff4
font_01_sfnt_off0000fdde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDE 18396 bytes
SHA-256: 847e59abeee9d64905bd0cf23bfc96f8e1859d37d4c76548957f95d7077adf36
font_02_sfnt_off00012d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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