Malicious PDF — malware analysis report

Static analysis result for SHA-256 a56364f5e60f9b7d…

MALICIOUS

PDF

79.5 KB Created: 2021-08-15 22:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ed4f6662fb336a42a6a46537260a68ed SHA-1: ac6f5200ef3b1266a4f801b1165741587684c844 SHA-256: a56364f5e60f9b7de27e22b50a2f19877bde902f164ff913af25f996f60a1e44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The document's structure as a link farm suggests it's designed to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/b4b7e3effebd7f283b264c923ae1ceb7/tagil.pdf
    • https://www.iieng.org/editor/ckfinder/userfiles/files/rodefokazes.pdf
    • https://ambient-interier.cz/files/files/84854540366.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899273e9baa---13042608579.pdf
    • http://barbusci.it/maisUserFile/file/1041203867.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4f360b6d3f---bulanapaponenet.pdf
    • https://iwistw.com/upload/files/verujurikekanexuwuzab.pdf
    • http://regimhotelierbucuresti.com/images/userfiles/fegikotewepufunilak.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c34d9562f0e---dezitufisobol.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fee2bc03a5---laxikez.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b293421f75e---texupaxe.pdf
    • http://chono.mn/uploads/userfiles/files/43135881185.pdf
    • http://c2ctrading.org/cms_upload/files/kifinegutusil.pdf
    • https://bbpartner.cz/userfiles/file/20257338440.pdf
    • http://fitviewer.biz/files/file/6418791596.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100ddd0515ad---92342108739.pdf
    • http://dienmaybaongoc.com/ckfinder/userfiles/files/lajul.pdf
    • http://laclonghotel.vn/upload/files/mufovu.pdf
    • http://chingyi.tw/userfiles/files/78340758920.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6d759cc91---6157999455.pdf
    • https://lesfeesdelhetre.fr/upload/files/1122321566.pdf
    • https://zoomkish.com/basefile/zoomkishcom/files/nutafozimevunike.pdf
    • https://cytairtool.com/test/userfiles/file/20210630_ef38d.pdf
    • https://alajuusa.ee/media/contents/file/lusetopugamefifabi.pdf
    • https://makanbanyak.net/contents//files/tologodewosiwinifeba.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d4077312f1e---27137701898.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=mathematics+for+economics+michael+hoy+solution+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_off0000d263.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD263 16792 bytes
font_01_sfnt_off0000ea75.bin
b66d651871ac5ba5c9f1ce58cfe6c1836556c17e737ee3f912ffcac2488118c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA75 16720 bytes
font_02_sfnt_off000115ec.bin
0223ff6e83e69d8245e040c6c2b4ec1b8e64748f3ab54d3509a2cfcf2b1b599d
pdf-font-stream PDF embedded font (sfnt) at offset 0x115EC 11092 bytes