Malicious PDF — malware analysis report

Static analysis result for SHA-256 ace094036dc28fd5…

MALICIOUS

PDF

88.5 KB Created: 2021-07-03 22:14:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e24cabb2446eb77cf112c277c89e69cb SHA-1: 07b4a778a8fd5d8b9421bc5c837e307e5431979d SHA-256: ace094036dc28fd5b36eb4d1eb6866303cb58a24a870d743602b46aa7753b607
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 phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious sites. The presence of external URIs and link farms suggests an attempt to lure users to external resources, potentially for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://napraforgohotel.hu/upload/file/28850779219.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16096dd4d30832---butunepu.pdf
    • http://lucann.com/Upload/file/xetifukitozupoz.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/f122c8eb5a7e92a4117ceee116597308/kemivore.pdf
    • https://olympicwroclaw.pl/zdjecia/fck/file/musam.pdf
    • https://atpl.aero/ckfinder/userfiles/files/javotige.pdf
    • http://citra.cl/userfiles/file/xazezikisefusinamunodan.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/02fk60gqc6evck53v307evdc3k/71192003633.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074bc2143759---zamip.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a320748407---turabarulasobegi.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/9861e19c3425260bb7471806227fd0e2/jubilusadofurojifevonax.pdf
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/56c7c2d027a2e03e9de72c3ca47ba8c0/97924788568.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/4006eb043713e3174a3dc067dfa40886/xixategazapiw.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/7db0b8f11977eb6fefc5ddeea256511e/sabikipokudogaxozixix.pdf
    • http://www.anjhimayath.com/upload/file/sasizetimidagupij.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/74378bebb8e4a581a6ecf4ce3ca05611/womadamafipekuvunafuvirot.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863796955ba---88837162739.pdf
    • https://directorvincentchow.com/fck_filemanager_upload/file/wunujabewejamewinivepape.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9d21bc6112416b60f30998da2fff4330/11432123361.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/4b61228d41edf438fb3b8f3e5be86ab7/72143342083.pdf
    • http://iccj.jp/images/uploads/fckeditor/file/85820526639.pdf
    • https://pachetedeturism.ro/images/files/noforofujipojel.pdf
    • http://sibmetiz.ru/upload_picture/29548813665.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e68557942---tesipazidofiwejitotura.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ace978f0141---48877691592.pdf
    • https://bbgpiti.com/userfiles/files/18742218875.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/e8riuhvr1fk42v9k1rqrftp3k1/84613394961.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=developing+a+personal+vision+statement
    • 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_off0000f740.bin
60bc299459ce8d271b7d423fb78a9415fd83e96e2b36df8d08102f147cf7d219
pdf-font-stream PDF embedded font (sfnt) at offset 0xF740 17976 bytes
font_01_sfnt_off00012414.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12414 16792 bytes
font_02_sfnt_off00013c2b.bin
ecc1d3ed386f64347d3dd0253fc9661b5dcbe5f99330ba47c79021e2d7828c6d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C2B 10664 bytes