Malicious PDF — malware analysis report

Static analysis result for SHA-256 4535ae6d2022abb9…

MALICIOUS

PDF

82.0 KB Created: 2021-06-25 14:00:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7c0df9954854476eb4c7e47a3f39c83d SHA-1: e7fe3baf4c7aa8a40bf493ba3a9410bdbc322640 SHA-256: 4535ae6d2022abb95abfcf73f65a7b3f2ed09d58476b257fb6a3f0935c450572
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The document contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting it functions as a link farm to redirect users to malicious sites. No scripts were extracted, but the presence of external URIs and link farm characteristics strongly suggests an intent to lead users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://inwebjor.ru/uplcv?utm_term=transmission+media+guided+and+unguided+pdf
    • http://hawks79.com/clients/85064/File/lojivakoramajofawis.pdf
    • https://ivanamihic.com//files/folizezasutagerunukub.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607281939f4d2---pavego.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/92bebc2a086905b5fd356533bee7f1a2/11356651864.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a3554159edf---86683356917.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9e7ebfc24---8977036189.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6d2f8510a---tuveliwitam.pdf
    • https://ppuhperspektywa.pl/files/edytor/file/25134323337.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/60e6cca7a1be0fb48a3c6f4867162f93/bifuwotof.pdf
    • https://blugarden.eu/file/66153442519.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160964ac611e82---58776192971.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/k4ckdbm14m2mdpg4725c037rfc/gulamejinunexan.pdf
    • http://brandnewgoods.net/userfiles/file/1128941243.pdf
    • http://ateliergermain.net/sites/default/files/file/zipefa.pdf
    • https://aulacvn.com/upload/fck/file/fowujegafisatirefu.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/0adadd8d7292b0a8ef580a3bcc2d3947/lurewujojuluxibexofov.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16094a61d29515---46237043017.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfc9.bin
a660c0f1ebd16a0f3b642e6fa9f5579650dadff638592decebdaeb31097ddcdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC9 10760 bytes
font_01_sfnt_off0000f840.bin
8680d20cb2586727cb891a887550ce0d936d704cab94e96bbe43490eff9fcd94		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF840 16480 bytes
font_02_sfnt_off000122f6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122F6 16792 bytes

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