Malicious PDF — malware analysis report

Static analysis result for SHA-256 a064f22c5a393abd…

MALICIOUS

PDF

79.5 KB Created: 2021-08-27 01:33:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 43c41e4c8d9f3137bd936de0bba35dfc SHA-1: cdd5406af7403bd9651d45466e30a5e981d74bb6 SHA-256: a064f22c5a393abd12c411b10dc646fafeb0136a3a1f4147242439d095149db6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the structure and URL patterns are consistent with a phishing lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.hsbofmn.com/ckfinder/userfiles/files/fevorezolozerowe.pdf In PDF document text
    • http://auksozvynas.lt/userfiles/file/fupunizap.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/lofarusitafegi.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/55169982034.pdfIn PDF document text
    • https://sinhadventure.com/uploads/file/9268481285.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/kavexikavegap.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/89687574177.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7c32e87c2---90278270823.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/f0e204572561fbc4157ad8debfa297ac/85013661563.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/ruvisavusesiladejiwawitu.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/a5759ee9b835c7a0c9d18810f07792fb/zapobupanivodevizonaxal.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/12843449202.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/26706253984.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/924c7739d530626777c6687e66784b3c/zodug.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/108oqcrrihj8jcjknk9once0nr/10933059847.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/64557700118.pdfIn PDF document text
    • http://portalkucharski.pl/app/webroot/media/files/63236551907.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/i1vuupu8a34iluu7887hdj8mon/13821168892.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/9ff0fadfe65685a833d871f7e8a60c02/5006281734.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/24919736010.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/37887652067.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/podoxofofilutofineriziwe.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160cc295877f50---54459040620.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087bbc978a34---ranama.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a5acb9d01---sazemoxizafedagigedel.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/88769956001.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=jack+and+the+beanstalk+slotPDF link annotation
    • 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_off0000d4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F9 16728 bytes
SHA-256: 1d97811c9a7a6c40ec70ca28324f9080a642ddbdef09726bc1fa3e9297715642
font_01_sfnt_off000100a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A8 10496 bytes
SHA-256: 94511339385ffe72d7d015ccf9f0c752244266b51fd14d55c41700c35e25a43b
font_02_sfnt_off00011887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11887 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1