Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb89335c56250a4b…

MALICIOUS

PDF

111.8 KB Created: 2021-08-04 13:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 311cf27fbc1bf9573c50760e2abd6980 SHA-1: 85e2b253c99541086ef640f97e997a2dd6bfeca3 SHA-256: bb89335c56250a4b464afb72f455fa98708da5fbdf06ee3eb845a7cc4ae1a7d2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to websites hosted on compromised CMS upload storage, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://ahchala.com/img/file/dativokedaxotepujuj.pdf In PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9e0735d22---tisisalejopurijosepo.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/19390846967.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/ef2b56f7aff4a63ef4bb8f977234795a/36591609491.pdfIn PDF document text
    • http://saintthomasmonrovia.org/clients/a/a7/a774d5b45fc75aba9c6fcf07501e1e58/File/vowewekawajomisa.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/cf21a3b65a71a36508e6755e02144bb1/sogin.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16228956295815.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/13b3652103b976d12570d101abce2b04/62064897640.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a521880ab12---xilifosemafupewor.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/jivofuki.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/redorobeminapajabipegus.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/47035217397.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/nonek.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/7121aed028ec834038f154c85ad31173/sepanuxejujipuzezaja.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/qr4repgims4e44gd5d3g2mv7e7/33534570338.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/995a5e56bab0dbf06fa2a913a673e891/53781402371.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/24792044668.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/87157509949.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/hamnfe5sq2rcbecl81qf11gb02/34611586405.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/9b463a1d34855a14e8b7f34293a0ebda/43103818511.pdfIn PDF document text
    • http://allasclub.com/campannas/file/vamipulesazavomoze.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/161045d95d316e---zaniwujofusujuwolo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=niveles+de+intervenci%C3%B3n+en+el+trabajo+socialPDF link annotation
    • 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_off00014d3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D3B 18572 bytes
SHA-256: a06b78e318db24522c3e2db8e9ca5da3a476c0ce44c95cca4b3d35cfd2771083
font_01_sfnt_off00017cd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000194ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194EF 10816 bytes
SHA-256: 518c86c48b5f47e62e348ebb8810aca67eff909b3a2a6dddeca06fb8a40964ac

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