Malicious PDF — malware analysis report

Static analysis result for SHA-256 191844f95e9e93ff…

MALICIOUS

PDF

86.2 KB Created: 2021-08-05 07:12:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 68c3d2a08d6ef812d9c00aa06f754e93 SHA-1: d6f444a8f91b412400acfae6918f6e7f163948fb SHA-256: 191844f95e9e93ff10b9097a25a19fefadbb3fcd28ad8baa704d89a926a3c4ca
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites. These links likely serve as a lure to direct users to malicious content or further stages of an attack, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779ae7b63cf---luxarifuxedix.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8c387dfd4---pokinevefonu.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c741197fb66---sefedafalid.pdf
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/96b2ebcc840190ea7216960dfaddc6ec/73478208861.pdf
    • http://bachova-terapia.sk/images/file/30381739192.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be2c3ca0038---fowak.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/94269b44ef4919dcb822e5c34915f96e/72673861754.pdf
    • http://elencostruzioni.it/userfiles/files/suwixekutixili.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087b6f620f7b---ponugasesesopon.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1609277b67eef9---gafuvese.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/f00bf328fba72c060cf092b210d7da30/53058584161.pdf
    • http://fabriziocar.it/userfiles/files/kuxatakak.pdf
    • https://liur-krd.ru/userfiles/file/xoresofosepozamelunumijiz.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/384d2a80957c706c527506348edb0943/9221408804.pdf
    • http://kondicionery-lubertsy.ru/upload_picture/file/45572110691.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a016994c46f---58410079093.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/n1r25nmc55ah8g7uqjlnkete61/tinaluvegowuf.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56a22e5b4f---63450203318.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/ad01416623c9462c51fc1d9b110e4e26/fevab.pdf
    • https://mabuksusu.com/contents//files/ravuxoforasajegozamoviz.pdf
    • http://ylgems.com/file_media/file_image/file/99845916505.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2a57dfe93---63268849243.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/f18d5e7f9772d02267e03d46e1539750/13353586615.pdf
    • https://krantiservice.com/ckfinder/userfiles/files/direk.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=gold+sequin+tulle+flower+girl+dress
    • 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_off0000ecdb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECDB 16792 bytes
font_01_sfnt_off000104ed.bin
2f3360dfda44e4893526dc0f1e0bce52b737ec7594386c12019b159bab22ac30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104ED 17420 bytes
font_02_sfnt_off00013292.bin
96ce8596b92d14cc4c41aa7530c46997740d9f43124c6081151853592279a801		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13292 10736 bytes

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