Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6ed0fd79dff67e8…

MALICIOUS

PDF

76.5 KB Created: 2021-09-06 21:25:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3c1c78c0cf89c40cae7a76ecd188e325 SHA-1: 0143f78957cc3a0617f142ef97a80aa683754ea6 SHA-256: f6ed0fd79dff67e8944ff1d5e77a0b032af82f8a7b6aa77f5fe8bbe35a79eb2c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be part of link farms or hosted on compromised content management systems. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://nomylo.ru/uplcv?utm_term=multiplying+and+dividing+integers+worksheet+6th+grade PDF link annotation
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202108/file/kixibitinu.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/bf4c1ecbf77d725b5d8873e122847b02/mibax.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/78819223154.pdfIn PDF document text
    • http://ubest.ru/images/file/tamap.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/nadexi.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/58348180996.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/21336067324.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/41285639565.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/bd0e40a29c302c6c7663cc16b3a16210/ketilomigedutudigaboroneb.pdfIn PDF document text
    • https://highrise.pl/file/1198871843.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/c81e5548050abe3057667dd91cf04607/20661086664.pdfIn PDF document text
    • http://ty-int.com/files/files/97448038842.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/70242795533.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/60220060153.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/jezewemasaxeko.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210816011449433664878.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/e41d1c8b6ad3954fa03703842fcb0628/baxejazini.pdfIn PDF document text
    • https://termocasasrl.com/file/lovaxosowitule.pdfIn PDF document text
    • http://sns.hu/_user/file/xutinozavabikibe.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/xovix.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/1af5cfff4a8cad4d0dfb8a3b4155223d/nofonuleguvogu.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c3c48031f36---13649549309.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/dofabazazap.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/98325687069.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607adf00d4b1d---fawuxagulerobo.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/fexumenolagisawajaj.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/wulozanozemaduvi.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_off0000c3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A3 11292 bytes
SHA-256: c4773d33b507242d44c31a756fe30e1617dd4a17518f80de87b25e3b2bb9f416
font_01_sfnt_off0000de04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF616 17804 bytes
SHA-256: 7aa35b7b5c609edd45f62336e7c036f4a9291b6638858668a16f431764300ce2

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