Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb5acfeadae7f1fc…

MALICIOUS

PDF

74.2 KB Created: 2021-09-05 07:02:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4be645164543f615d97548eb2456c8e3 SHA-1: d6c0c4f0409977bb29f3de6ca3cffe902c27fbd7 SHA-256: eb5acfeadae7f1fc1361854964c8565e7d94e369e911da40609b777428db3e33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to other PDF files hosted on compromised websites, indicating a link farm designed to distribute malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ClamAV detection and ML classifier further confirm its malicious nature, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/bb624172df73987826fbdc17e7c52684/nawigarekusubetu.pdf In PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/ji0db3knmj9clqhtgtd1r9975u/30633698692.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/75086935774.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/ac6f7mtsadr9il3p6iogavqe06/46520540682.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/98826171680.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/vanatomepikixelugad.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613427dfe5729---fiwarapusuvesofajuwalonu.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/zavesudadukipujalut.pdfIn PDF document text
    • https://termofriz.rs//files/18732369585.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/pojawu.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210522093511.pdfIn PDF document text
    • https://dcimx.com/files/kipatitixafeterubuzuninow.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/xasufoju.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/bovebetuja.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088f7d63dd4e---fadalonavanove.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/jatosawuxegivikopanolera.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/80336651845.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/afce92756e11b4dbb6ebb79a3aed0d14/747867837.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16093a5ba98ff2---99362214464.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/65643936433.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/37222682203.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/nuxikot.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/jijuzolug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=vamp+50+relay+manualPDF 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_off0000c39c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC39C 10376 bytes
SHA-256: aa707400b19dd3678a421b48c1a9d9bcb9392419dbb541df62bcd1b10803eb8e
font_01_sfnt_off0000db18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32A 15804 bytes
SHA-256: 775d6131f23294e062fbc6d6d6a356da03805eb671bfc138a5aa2ac6f4b2868f

Open this report in the interactive analyzer, or submit your own file for analysis.