Malicious PDF — malware analysis report

Static analysis result for SHA-256 32cd7a5c7952993f…

MALICIOUS

PDF

179.4 KB Created: 2021-07-05 17:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f421a0439ece7c251f7ef28bea511a9c SHA-1: 04335fca27d7272465b7d4b524819c962a68bcf9 SHA-256: 32cd7a5c7952993ff38d070972e707844ae9ea0bba0b6f3bb624475a1e6c62d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, indicative of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9742

Heuristics 6

  • 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.
  • 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://philabc.ru/uplcv?utm_term=lord+of+the+rings+the+return+of+the+king+pdf
    • https://unosms.us/userfiles/file/93223493425.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609825258835b---43558032781.pdf
    • http://curry-box-deluxe.de/userfiles/file/feselogipi.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0240b99785---9438894993.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751e2d7765f---67235900488.pdf
    • http://helderlive.nl/ckfinder/userfiles/files/xagububepivagi.pdf
    • http://solee.cn/ckfinder/userfiles/files/zavobibudofifevuzuruwag.pdf
    • http://shinex-auto.com/userfiles/file/zoletilozevakuzajex.pdf
    • http://proxkimya.com/resimler/files/20051649690.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/415d85e515dece526456ec580598226b/pavigivusamirak.pdf
    • http://kozelskadm.ru/files/uploads/files/diselowufinoxi.pdf
    • http://singer-island-condos.com/userfiles/files/83869807064.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/4acf613d8227b988a8b2e3493971869d/52048867729.pdf
    • https://fid-data.fr/app/webroot/uploaderfiles/81285448115.pdf
    • https://tavio.ru/files/file/wekonuvigeze.pdf
    • https://giverny-bkk.com/upload/files/xepasesutuzu.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ribae2c103gdaaro6rk80bhtc6/dopofeda.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd65b7d8b1---xesedoxudedagomejuja.pdf
    • http://ymy-tea.tw/upload/files/93396646020.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/guts2m1rdeatuu82hjjjkdnq6d/tasotapotimeruzasedup.pdf
    • http://artecgroupservices.com/imagenes/file/67067290916.pdf
    • https://karinbentum.nl/uploads/file/5698185965.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf2eb0a67c---zesabutijibiwofaj.pdf
    • http://axwelindia.com/uploads/nuxumonusulubewudatumiv.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/d6450f5cb48789274870956264fd1ddf/87540801107.pdf
    • http://janyska.home.pl/_mjanyska2013/fotki/file/91415268852.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00025ee0.bin
666e12565ce56d4a54fd1f0281fc362dd27e902597701d6ac346a3cec0fe9444
pdf-font-stream PDF embedded font (sfnt) at offset 0x25EE0 18596 bytes
font_01_sfnt_off00028f16.bin
60ad6551ae698a9b4d9c7a47ade857be8f38585fe4c27963ca2a5d213497f8d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x28F16 10716 bytes
font_02_sfnt_off0002a76a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x2A76A 16792 bytes