Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c7ed9509e3dd39…

MALICIOUS

PDF

68.4 KB Created: 2021-06-04 23:36:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 018b195c54a129b4ad8c8e7ec50ec0c5 SHA-1: 721d1e433aef5a1cd59e8547c1cc9d24cc28ff8c SHA-256: 90c7ed9509e3dd39a9f8d69d4b5f58c58ea11cd9dd91d6d8f808fbf50ed4cf71
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS upload storage or disposable hosting, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://allytemp.ru/uplcv?utm_term=what+is+aesthetic+theory+in+literature
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8ffcbdb97---sinosub.pdf
    • http://aisef.org/uploads/userfiles/file/file/duvonolisopogi.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6d9a2c197---xasewaxojelikekivomuw.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/fb712e8c9d549a47dc303275377d72b3/judiva.pdf
    • http://ufnk.fr/app/webroot/files/file/77518459352.pdf
    • https://szaniterplaza.hu/ckfinder/userfiles/files/zutunojobikew.pdf
    • https://cgeminfos.ma/upload/file/89554614004.pdf
    • http://donkaew-furniture.com/ckfinder/userfiles/files/texes.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16096057ae404a---2889087604.pdf
    • http://goteneplast.se/files/images/file/lunemegujega.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608af6c2e4a39---79618504766.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/3f4ce73d2cec2ea7f3f55ede6d54acf9/bifotigajikemo.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/2137a015826df91bc31f56431570cb36/nirekemazutapini.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/8b042744f2670dd38daed1cb39b2a372/68668012140.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0bb.bin
6a8d21f51f046eaebc0a9b93325c17dc0adc96fdfe7a899f2ba5a251bab25d0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BB 5000 bytes
font_01_sfnt_off0000e1ca.bin
324c749160e7d5ba46c82ae69693e2d16bc23c120afd0dabaa4334780ac93bef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CA 10308 bytes

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