Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb5b397027ed9ce4…

MALICIOUS

PDF

98.1 KB Created: 2021-09-07 05:25:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 3d56365f12a410b5c2202131ce5315a8 SHA-1: b3ff713629b9c1d92a09b76bfcb8d4b6c21a9a5a SHA-256: bb5b397027ed9ce46a82ee47da47a348064be6acb89b85f3c91d04d14f1fa575
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://hanhthien.net/uploads/file/364056257.pdf In PDF document text
    • http://luluscafeonline.com/uploads/files/gokeponibusorufew.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6b4363c45---disokogiw.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/genawarew.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f97fc9460---puvotexababorag.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b17ad345f8---97586309407.pdfIn PDF document text
    • http://afslab.asia/upload/files/71515429850.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/gozoxagazavepasabif.pdfIn PDF document text
    • http://opsir.eu/files/file/jelidigir.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/botoxumowunoroxejofurobuj.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/8680768264.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/481e7e1fe797146f3be3fe3ca4a8224a/disopedixepoxoriputegeg.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/97008282159.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/kedef.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/vi89qvpff1n4l0fme0o1mvl9b3/kotesuxufizigoged.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/gosawemojiju.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/pixojibakineju.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/57227094072.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/xakedugu.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd28b40478---50527215015.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/cf6e84dafa8f607ed051afaa07c068a6/zexaxedofakem.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/18096181735.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/56799109753.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=download+entrepreneurship+notes+pdfPDF 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_off00011aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAC 10784 bytes
SHA-256: 6f49c5b75528ebe4956365e3f794d80f6baa105b7d017b6f0209d3b5a0c199fb
font_01_sfnt_off00013374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13374 18312 bytes
SHA-256: 1f78f6d497090dd0ea8924176ae9084b5db77ae28ba80ab778c11e5954bd76af
font_02_sfnt_off00016261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16261 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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