Malicious PDF — malware analysis report

Static analysis result for SHA-256 8588e5191d821309…

MALICIOUS

PDF

87.0 KB Created: 2021-09-06 13:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2aa6fe93cf7a9faa1362de5426f2e7e5 SHA-1: 5182d1809956e797fcc0638e0b2b5130e3b26b4d SHA-256: 8588e5191d8213094eb0a93c134419bdd15d3698199ad00306f19faf2b5cffb6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to obscure the ultimate destination. The presence of embedded URLs and the nature of the heuristics indicate a phishing or redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f4bf394de90---kisulajoxelepep.pdf In PDF document text
    • http://autoscuolavalerio.it/userfiles/files/9327044649.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/f0561ffd2e6c796310290077936ff63a/67900359754.pdfIn PDF document text
    • http://diclenakliyat.com/userfiles/file/kosabeditafunaki.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16083c9917dccc---83613082154.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/26bba2b62e9196760f35c77d69fc8c3a/kekakalopukedigozuwejezad.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/4eefbff55e6c4b7e27a190f69bf14725/4447814590.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0593431a2f---51495138300.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/697c60b5e9d580ca573b069a6d9a05d6/kugudepagisijaribaxaje.pdfIn PDF document text
    • https://ghnservizi.com/file/tozezunakisepivux.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/25205218546.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/29745866445.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/xosotujejidetevupi.pdfIn PDF document text
    • http://camera68gialai.com/uplaod/quangtri/files/vudigezivemek.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac44463aea5---95794660051.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/ce6a3945ccb02822ceb234b1e3294b2a/tutilowisopesorexakuwupu.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/romiwulobadaninedom.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/80998338208.pdfIn PDF document text
    • http://huiking.cn/uploads/file/051448207038.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/vidido.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/89064730132.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/dulovelofebepizomuvuw.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/3534692794.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608b58c93f7a7---9570497577.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=varicella+zoster+virus+pdfPDF 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_off0000ee75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE75 18196 bytes
SHA-256: 1c1d7f0101d3d0f5450e5b8dd58d5a24db5c7ebbb0fcb747e3ae7ef1d673718a
font_01_sfnt_off00011d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7E 10704 bytes
SHA-256: 3a71c6254b22513cd99ce712f640651d61b92cc214d5a3b7b5eecff79163ab95
font_02_sfnt_off00013645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13645 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1