Malicious PDF — malware analysis report

Static analysis result for SHA-256 61d88999fc4df847…

MALICIOUS

PDF

77.5 KB Created: 2021-10-12 10:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e4a07a721b82d37bbde0a4e056d5132a SHA-1: d604148c451c7f9ff3044ef0c52edab7d15c9a5e SHA-256: 61d88999fc4df847c1d87649f6eff19de070bc1e2199937db486bfb88f5edc2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm that points to multiple external URLs, many of which are hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The primary attack pattern involves luring users to click on these links, which could lead to further exploitation or credential theft.

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 http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614df635ca295---78197705502.pdf In PDF document text
    • https://granitabrasive.hu/editor_up/6233545488.pdfIn PDF document text
    • http://bronia.org/userfiles/file/kevewobalolupanu.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/99867652238.pdfIn PDF document text
    • https://ijaetis.org/ckfinder/userfiles/files/tanafojurimereg.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1615011c10e5cd---40809177327.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/4516143049.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130e4133d062---73339479073.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/vatilakijodipusesorevo.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/91890448708.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/daxupupolifevig.pdfIn PDF document text
    • http://gachmenminhchien.com/media/ftp/file/gifamozaxuja.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/85080774473.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/18229557340.pdfIn PDF document text
    • http://zjgjqmr.com/v15/Upload/file/20219252245128585.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/38277651762.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/59569969103.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/foxaxofuzopa.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/09b309a9fcc15ee5a9ef5d26dfeca194/74543471273.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/16823106997.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-10/20210910142537377720.pdfIn PDF document text
    • http://glassick.com/userfiles/file/94610313340.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/ad96e69c6e5d42bb93dafde199c564e2/19893062437.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/TSvcnjQ06Jg/uplcv?utm_term=gd%26t+stack+upPDF 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_off0000cd1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1E 9252 bytes
SHA-256: 78cdcad42cdd225bb93e0ab49b11953281bf332d9afcbcac27717ef38fa03627
font_01_sfnt_off0000e087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE087 18320 bytes
SHA-256: 654fc91bec89a1729192af637d013ea5b8e6bcd30dd496b58679f4804ae1ee81
font_02_sfnt_off000110d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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