Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a5cb0f0b23f530a…

MALICIOUS

PDF

74.4 KB Created: 2021-08-29 22:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: fe396bc84d41dc7e2261caa2e8dec50a SHA-1: b95facd400cbd41e7edb9b39db7d6046ded3307e SHA-256: 7a5cb0f0b23f530a6bb55d2ac1d517b0a15b4708e942f2aaa6034cc49e34f374
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve further malicious content. The presence of numerous external URIs and the 'link farm' heuristic confirm the document's primary function is to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a699bbd5320---nipanimefewexepo.pdf In PDF document text
    • http://leguido.net/files/venijowivebim.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ffda6f49836---lemivefokef.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608aff750fe79---baderatuluveriburor.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/g5h8vkd2g1509b8bf1efarp6oq/16654742810.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210730215812322378xg72s.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/bawaxolitafojezulenerov.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/67971723595.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c3ce58429---45465934953.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/2084827021.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/xuwexiwetiramig.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/20208410095.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/749ad8d0ced38f7b210dd7233bd32bb5/lagasajimuwa.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/linewesexazek.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/gaxila.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bcee083e667---82110346506.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900fd6601fb---71419104923.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/033387f1a5df76b0197a240c192e3ddb/26446896649.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/97174070501.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2ee050b1b---43362428135.pdfIn PDF document text
    • http://15fratrowreunion.com/clients/2/2b/2b18ccadde375fd95e9ac2d5db5aaa67/File/sulimijagelefadawir.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/sexetavepawulagid.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/gokopulalinazago.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=performance+appraisal+comments+for+quality+of+workPDF 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_off0000c0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0D6 11180 bytes
SHA-256: 5ae8815af9542483179f73669763fd7f64b0e4d70b5dc5c70219d5274b12c522
font_01_sfnt_off0000db10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB10 15752 bytes
SHA-256: 1ea3737a62a350308f151b06e9d6dca5c31b363a81c9987a96199930f52b1f74
font_02_sfnt_off00010309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10309 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1