Malicious PDF — malware analysis report

Static analysis result for SHA-256 377c3bf171d776e0…

MALICIOUS

PDF

82.4 KB Created: 2021-09-04 11:16:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: db660c556fa87fa8f080b0402d3395ff SHA-1: e19b828e6eff373d8c2d3e408f5f479ae18d93eb SHA-256: 377c3bf171d776e0e22a1f3daae9360edb7a5141c1e8e6a83baa905b80c7ff6e
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm with numerous URLs pointing to potentially compromised websites, suggesting an attempt to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings indicates a pattern of using such sites for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/d22ed00cfaf58090b12b40de69067689/35045056063.pdf In PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/316b93e874f4c534c645898b316b1600/fexogad.pdfIn PDF document text
    • https://magatek.com/documents/file/29442412295.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/d1bd81185a32f2c9b794d66484a237c1/8936599404.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/23544426051.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/e6a7e8cba277c5820556480a6ee5c3d7/liputuv.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/widivavijepomigorebibixo.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/54d3e0f2c002c3b865c554c49b23de06/61889018418.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/6748f7ac99588d1fb5626716cc14b31b/gowedozisezoja.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/d8luc2r8mpn4fgi2dmfoekj97u/zuxizubemukinulegozo.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/90882021004.pdfIn PDF document text
    • http://bertolinacare.it/file/28545235181.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/vemivekogud.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/worepejevojesotiti.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/beminevajasa.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202108142346472960.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/utvj4bd4n194esb49c07hpegu7/97155901562.pdfIn PDF document text
    • http://iziusb.com/userfiles//file/juxatamozanifus.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/76575845653.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/monimugi.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607869300cd6b---rajepijejofuxanakoridaz.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/29194706544.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=jonathan+kellerman+books+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_off0000df80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF797 10896 bytes
SHA-256: 350ab3299adbffa5558460895df72b2002ea3bdca5677b170820525a6d89ef36
font_02_sfnt_off00011065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11065 17204 bytes
SHA-256: 947ba8bf97930c922c16bebf1fd48bb27ff199be2317229b8194136c53c379fe

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