Malicious PDF — malware analysis report

Static analysis result for SHA-256 556df2f9df9313cd…

MALICIOUS

PDF

81.5 KB Created: 2021-09-12 06:30:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 360aa543b576e32633246e287d591872 SHA-1: 6012bbb1c162157142c95acdc2be169cd07e137c SHA-256: 556df2f9df9313cdd93e24df2dd688052e997c927850c0aab20dc93ad982caf0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including links to compromised WordPress upload storage and a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware via the linked sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=free+ml+diamonds+2020 PDF link annotation
    • http://pronobile.de/catalog/file/42791674309.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/vizikozavoxupefa.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/vevigiguxarafew.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/tukevikomufetu.pdfIn PDF document text
    • http://laserbeautymachine.net/d/files/zirononog.pdfIn PDF document text
    • https://hediyelikhanem.com/calisma2/files/uploads/69395501705.pdfIn PDF document text
    • https://jobtiara.com/files/files/45480601707.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/dunugapurazekoxi.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/mamonopusuzukupiwowida.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/96428613477.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613232b08a735---barisoxikakirux.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341ef53b2b4---68327701824.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161316bcdcc808---43045278285.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/32183609299.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/84763550738.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/be4abc46aa1a8dbe03994a447c58b6e2/93695394502.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e0ab32c6f---vanenago.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16137c1c2358b8---85661071467.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/titefudukexezar.pdfIn PDF document text
    • https://ganport.pl/userfiles/file/28186604148.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/kedalap.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/74896524688.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1630586849.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/renotukibonabafalazabut.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/38768063369.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/forapisof.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_off0000da8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A6 10528 bytes
SHA-256: 517ce1e02d02312a01c1dc478bbf6fd9bc9a18dd67417f6dbc830af7e99c1b61
font_02_sfnt_off00010a8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8A 17660 bytes
SHA-256: effa71615be3fa40a9698dea4d5e32fe3e9ab2ded5fcae7bea4916ab5b84ebdc

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