Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f4a790ea3d86e21…

MALICIOUS

PDF

91.2 KB Created: 2021-09-20 03:24:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5da95fda600f9001b6f9fc6b1a5ee66a SHA-1: db6bd8435de41bac75121dd4e86596ab879ed8b6 SHA-256: 0f4a790ea3d86e21413d1bfb4794699df7f175e0e79987c7b340685ab7add790
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by multiple heuristics as containing a link farm pointing to external URLs, with several hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the presence of numerous external links suggests an attempt to redirect the user to a malicious site, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://coretry.ru/uplcv?utm_term=foundation+engineering+pdf PDF link annotation
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/rovevibexugetawujiluxako.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/porowur.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/u8af3pk8u7vq7p8lfnf3o17to6/95752012678.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/zagovu.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/lirojodogobo.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/ledoz.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/161408a7883ac8---7800572563.pdfIn PDF document text
    • http://salkim.com/userfiles/file/858999110.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/83211540381.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/fujoke.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/bemenokowivu.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/vederikugusafogom.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/jufufo.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/58764478385.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/31487708144.pdfIn PDF document text
    • http://ana-jsc.com/upload/files/26800950754.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/dutidizafujudekurotobuz.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/2772783274.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/xusenaviwad.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/24170297891.pdfIn PDF document text
    • http://myarrahnu.com/mo_images/files/45273355407.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/wuloroligesuporowiz.pdfIn PDF document text
    • https://foundlight.ca/home/foun6192/public_html/files/custom_files/file/zinejokagawufit.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c35e101fc0---jupuza.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/32180944227.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613e05cb450c6---73857907497.pdfIn PDF document text
    • 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_off0000ff1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1F 18628 bytes
SHA-256: ff1c38b26574478a8baf1618338f067f67510686448e61f7f733232447bafcec
font_01_sfnt_off00012f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001477c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1477C 10536 bytes
SHA-256: e56f48b0a46b658506aea52f0288bb0d3cbc9151e78f3c4a41ab9296b21ff89e

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