Malicious PDF — malware analysis report

Static analysis result for SHA-256 79a5972efa1131aa…

MALICIOUS

PDF

78.5 KB Created: 2021-08-15 02:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 09708133ac0183a6e4599628bfc66d73 SHA-1: b17b0dc95e468cb118d50297e061d493f7e4ab2b SHA-256: 79a5972efa1131aa144a789a2ee1b7efe7d195492976873cf0080e66ce6353bd
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farm heuristics indicates a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://huntic.ru/uplcv?utm_term=oraciones+con+sujeto+y+predicado+ejercicios+resueltos PDF link annotation
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d45e5c27d---sapilajebuveta.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/6df3c674a27dc38c41bc92edaa1e375f/37022940227.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/nuxitunogiladeduti.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb35eecb3e9---62883625037.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/wukilopujumarin.pdfIn PDF document text
    • https://chauphongasia.com/wp-content/plugins/super-forms/uploads/php/files/jcamkooj17vn2lt4qoeuhce822/simafagobatelixaje.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/00ba7aa72111236f28c25b1c352daa97/fowegaxanagotudenasodazux.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/21ae6a18d2c881d21f8df3567ce02461/74130046253.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160af7f7009e6d---73020777897.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/voxapojusuxujusuviza.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/lupozajatelad.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210716231207.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/gopadirelikotixux.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/40765576560.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///wosezufasibemunuz.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16084d04094de6---jogowedavamowelitewefu.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4e11737e3---598392945.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/bepararebuji.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9b4d92707---logesajugubagovizapale.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/72791546334.pdfIn PDF document text
    • http://njchemland.com/upload/files/77489318608.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c29d502d5bf---74624508158.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021073101154053.pdfIn PDF document text
    • 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_off0000cd56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD56 17760 bytes
SHA-256: 275dcca39d7be92ea645fa00d224b17dabb3bc58b6e87623e83444ae7edd63bf
font_01_sfnt_off0000fa87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA87 10876 bytes
SHA-256: d75a97ca9ac0015791f071148110467275def4731e0f65f7de62f2ab30b4c703
font_02_sfnt_off000113ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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