Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf25d707761f273b…

MALICIOUS

PDF

94.2 KB Created: 2021-06-30 21:01:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 763ca61b9ef034fc9778c4ac34be75ae SHA-1: 90c12617eec4c16b3f0ec62bee966cf6f7191d98 SHA-256: bf25d707761f273b18d3191fae97dffba76e87920e3ff327477ef237cfd0341f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, forming a link farm. The heuristic 'PDF_RANDOM_URL_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a pattern of redirecting users to potentially malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature, suggesting the links lead to phishing pages or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://bigband-ulm.de/userfiles/files/bewidiwiralos.pdf In PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c62dfc3b630---44423975547.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/05/file/202105231624055291.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082b1024200e---86196759937.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f25979680c---99837110439.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/afi6ic5qcfe9a1g99u02499ds4/31496323370.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/2bd9d74fe2db0cd20a39de20cb346ea9/10055758705.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/b86b2207df553b043c49cfb7f2d67c0a/29771901547.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/r2dp0jklvopv4dceup79167mt0/15845043577.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/katepobufu.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/a1987b26a975444cb98344dc044e1c9c/2393035509.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c1d5678abb5---92785556404.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/bototegipojowexumoloba.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f50aa6b851---labawezevigusiwal.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/30965730436.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ae816ca4b---papaxukip.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/162299814881.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608541b64a9c1---87087778220.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160931ffbcb76e---gisumogezidixipigimebiji.pdfIn PDF document text
    • https://btegypt.comfile/xodorufox.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16078175329fe6---pobikavavonekatusazureko.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/84387373943.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/c7b360a36fe506aec64e57eeb70ff0af/bidubuvodaxaluxanu.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/wamepazozuzibagev.pdfIn PDF document text
    • https://vestol.bg/files/file/jeleselosat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=probability+theory+lecture+notes+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_off00010b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B93 11072 bytes
SHA-256: c68a32497b7d673c7510c8630a5746db64fd7a044a1bfb026dcc4fe602cc1a47
font_01_sfnt_off0001251e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D30 17220 bytes
SHA-256: 758c795d22eeb85acb999a7bf05096126011e09f6393a3870b685aa408e4f862

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