Malicious PDF — malware analysis report

Static analysis result for SHA-256 26143fdbb9ff3ccd…

MALICIOUS

PDF

101.4 KB Created: 2021-10-08 18:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: c1e13fbf9d4970abf433f33f65b95d05 SHA-1: 5a72fe6ccb20992bb586294d2de2a5f7f30c5cf7 SHA-256: 26143fdbb9ff3ccd859e88baf967e32c39b4e08d20f2cb586f986ca6c7fe5535
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded JavaScript likely facilitates the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=a+bottle+of+wine+is+equivalent+to+how+many+beers PDF link annotation
    • http://giovanniseneca.eu/userfiles/files/76817706000.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/161403e7e7392c---10989956392.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/63955446662.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/dunokebuvuzuxaweju.pdfIn PDF document text
    • http://www.andreapondika.cz/file/latufum.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/59122940871.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/45253154454.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161355e086bd29---43602477346.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/9196973459.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109211106284695.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/pawiragatitimolevixofap.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/lupilewixajopifapokoxim.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/13689356047.pdfIn PDF document text
    • https://luminex.pl/upload/file/zegomipegorugenarin.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/70313567534.pdfIn PDF document text
    • http://www.pvvc.cz/files/34775576416.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/fe1fu53dob6sbmt091f03hrro2/maxip.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/litudilit.pdfIn PDF document text
    • https://loonbedrijfschimmel.nl/userfiles/files/rudatimumofirikorinor.pdfIn PDF document text
    • https://kratky.eu/files/file/78816834410.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/vijakugok.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613de06e0097f---vukefana.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_off00011d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D22 22084 bytes
SHA-256: 8e174bd744366bead66d5166abc7ca93d2ba32595e56103cd87453d86dc56aa0
font_01_sfnt_off00015629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15629 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016e40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E40 11112 bytes
SHA-256: ff4cd2bbcad48b505ae663f26c1016bf2573cea8c09834ff49fb7d0c3f4067cd