Malicious PDF — malware analysis report

Static analysis result for SHA-256 a66f2200df81a7dd…

MALICIOUS

PDF

79.7 KB Created: 2021-09-07 18:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 721fc7bf2ce3f64c52b9412dea563f66 SHA-1: 5733a634d5aebfadac738c8c69b0e6453bad47b6 SHA-256: a66f2200df81a7ddf4a67307b85daa3e3f35b284b69fe898af518914a2583771
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or hosting malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, suggesting an attempt to manipulate search engine results or leverage compromised infrastructure. No scripts were extracted, but the overall structure points to a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://crysiq.ru/uplcv?utm_term=ford+ranger+2011+manual+for+sale PDF link annotation
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bd7e0730c---zijugivegisuwotakipakej.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/19879397377.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/9eb7daf7083981a962f5306fc0a4ce80/8079484593.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/vivizubemedapipojek.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/nagidomominurixiwemenazu.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd37bb2c656---tikusojoxakatarubova.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/48140888814.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210902233028.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/fqmnv8qsh8enkpcl1uakq08uul/48406859989.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/zepezi.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/21536272772.pdfIn PDF document text
    • http://egitara.com/upfiles/files/89765979026.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/255806d357580931dfa55c9c575d527d/nufoperarisujafowosu.pdfIn PDF document text
    • http://campcolefamilyreunion.com/clients/82065/File/68487301103.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5f684570b---12356261689.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/87251523314.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/nijejewofivifakijegej.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/xelib.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c94dcc05348---ramuxagakosisazakufef.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/2flro44f085n5pfna36tbi66r2/29820446523.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/sefekevuvedu.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/maxotitoledag.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/zunebisejotofajurelanuzon.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe632e40cb9---xikotinoxurivoroluxot.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_off0000d4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC3 16820 bytes
SHA-256: 236fa3229f4f62e3e10ceaf894330803ea62f4cf443f4c8d5217e8f81e387bfe
font_02_sfnt_off00011860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11860 10880 bytes
SHA-256: c02517e1550d54b3e88c569e5514305934445dc97fb01baa24f874d9d7c3e9e0

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