Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4e282b3ac7123d5…

MALICIOUS

PDF

91.7 KB Created: 2021-06-25 15:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 59720177b9299f4f0a812abf1a586208 SHA-1: 0a8a4c90d2073b5b4828d488cfa52abf42b00207 SHA-256: d4e282b3ac7123d5b8648eb3f7bb987338371bba1c498c155eb9ab443a692918
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The presence of a link farm on disposable hosting and compromised CMS uploads further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://belhasasecurity.com/userfiles/file/rijeriledudazaxotaviv.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5322a992b---55450621707.pdf
    • http://omgmediatank.com/userfiles/files/46012147993.pdf
    • http://www.emailposte.com/pictures/notujowupizugiki.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/pq79brkb47mf5psmm7kq1ncjff/62155667667.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/a931c383e7b4dc7298e170feb24207a7/tixoromoluwopetak.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/5b5dd878e0c09103923c4540b63f61e8/jaxidamusofunit.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab08902e83---pomisubotetavuvekax.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/325b4fa79c34added13dc77fe7e1ee42/kamajevotofa.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/ff7bbbea9c4975952756e2048b56bd7a/mewusolupixesaxibamipup.pdf
    • https://fallsplat.se/file/ramuzepijaxufif.pdf
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c6cc501b6---jetikejoluxi.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/n74sddkg2h9gdi1vah6gn511uu/2689962316.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/b9c8df39524f716b61fc5e7eaa688f6e/4797276996.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f46807a035---98386338157.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c119ee55a4b---71632884885.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160778c6628949---nobuzupopifetetuxemajefa.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160982b4e48c2a---dafitarifefuxi.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/c597c798cc53ebcb4f6c613bd43b8870/18817159126.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=simple+present+with+verb+to+be
    • 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_off000100ef.bin
8ab7a37b8c0d4f07e8a2a2d2b0d9b58134527d752ee7f7fe6258cd5562c0fef5
pdf-font-stream PDF embedded font (sfnt) at offset 0x100EF 17804 bytes
font_01_sfnt_off00013005.bin
6ed97d32d4b05f306e73e7166318f8fdc1106fcf6d69bd7afa7b9a461a05c28f
pdf-font-stream PDF embedded font (sfnt) at offset 0x13005 10720 bytes
font_02_sfnt_off00014831.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14831 16792 bytes