Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c54cc04015dbcfb…

MALICIOUS

PDF

85.4 KB Created: 2021-09-03 19:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0f68121b42c730e79484f51278d80293 SHA-1: 5bbc4891c3023ff6034caed25f7ae7785a3bbf95 SHA-256: 4c54cc04015dbcfb1fe818d360d96e7c80ecb9bc9ff4319a172d1c16b2fa973c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which are hosted on compromised WordPress sites or disposable domains. This indicates the file is likely part of a phishing or SEO spam campaign designed to redirect users to malicious content. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=manual+burr+coffee+grinder+javapresse PDF link annotation
    • https://somogyplusz.hu/files/degepawozovemen.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9788266b30---wuzegorififaxumeji.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e36f625ba90---tenirexotifigebuj.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/nulotivigogizomavovara.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropadefutbolbarata/userfiles/file/52006060476.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/qouioro95e0q2iicso5ihnq4lh/vasexawapewe.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081fc4e03c0d---63303373076.pdfIn PDF document text
    • https://ka-base.no/images_content/file/jofufixotunikebawanamam.pdfIn PDF document text
    • https://ibericadearmerias.com/file/gomewulezo.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/23784359552.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/0frrcoqrd2vd3jg2ho01fgq70u/lutetijonivo.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/000439f3d4c38ed630e30fdbd82e871a/5919401143.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021070917152373499.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/disudedurovarof.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a810bbcbfd6---64582613813.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/4b2b93f2c9647dd6f9f4bc10b0895ca6/23057716647.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ks2ae4gpitk6nltcebnjvjh8lf/mapivitakonanu.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/a3189a2c8c1b3c5f69f8ee356d93f125/lenunavuxalekixipanoses.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071978e29fdd---tonanig.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/295bc9c2461b4de96a7001f2d5a49235/99978648696.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e216107d75---17877417359.pdfIn PDF document text
    • http://upbfassadenbau.com/upload/file/88083905914.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/vinelexesemafulanaranaja.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/zerulafiwig.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/safoxuzowa.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_off0000e6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF07 18008 bytes
SHA-256: 9b64a539d7b073052ea8c9d077951e2ef72ba2c18bbabefd2d8c0dd78db7bb75
font_02_sfnt_off00012df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF3 11128 bytes
SHA-256: fccb3e994b51bb69512936b2d0084ee07ad94b4865ff99bc673fd408cbf03761

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