Malicious PDF — malware analysis report

Static analysis result for SHA-256 24e9e081d7ceabb1…

MALICIOUS

PDF

87.5 KB Created: 2021-09-16 05:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c4ca973b64fa628df421b386a22226a7 SHA-1: dca21c574e7c43849ae6a956571a4a9e27124203 SHA-256: 24e9e081d7ceabb1be6eed30c1074360546d2f2069d4c7d79faadedaeb20a0db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external PDF files hosted on compromised websites, suggesting a link farm or SEO poisoning attack. The presence of external URIs and compromised CMS upload links points towards an attempt to distribute further malicious content or phish users.

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 https://almudenafernandez.co/ckfinder/userfiles/Files/nuduzazaf.pdf In PDF document text
    • http://dyglas.com/userData/board/file/fosuzoxit.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/tufuvu.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/16333356666.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613938238003c---25713121266.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/42537866229.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/14624635307.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/bumasiwegim.pdfIn PDF document text
    • http://hanahana.vn/media/ftp/file/lexovobopipesirawazipe.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/82015385013.pdfIn PDF document text
    • https://kawanmto.info/contents/files/jubipamibiwusizelevelow.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/22347750517.pdfIn PDF document text
    • http://naviway.su/upload/files/46942294972.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/52344597276.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/fekokabujaxani.pdfIn PDF document text
    • https://grnca.org/img/files/files/tarovukugejasa.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/b59abbc603488df037b7d28543309996/99346559475.pdfIn PDF document text
    • http://marisqueandopremios.com/campannas/file/zasefaruwadaxa.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/lopaj.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/a8ac399b238951243b47157f4c83ad2e/lunevuxesodalirevulisow.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/sepizoji.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/8198161453.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/6185972216.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/bepolelipavol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=free+soccer+streaming+servicesPDF 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_off0000ee0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0A 18852 bytes
SHA-256: a26108d945f336310364a696a933f33f37f50343f0061c4d7c5bf8e630b2190b
font_01_sfnt_off00011fa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137BA 10568 bytes
SHA-256: 83ea544a4bdad2cf5d25c5cf1bff684032c6ba5f2e5ebd310728d082526fb8f1