Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5a1a93cea0cef63…

MALICIOUS

PDF

84.9 KB Created: 2021-09-01 13:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 597180ca685ac2dec8c651abd4d7f031 SHA-1: f3dda331905c589d3a11e8fe565d06e4e7fa6f9b SHA-256: c5a1a93cea0cef638421e368f5712d24e3859de73824713f7973c1b07493c4b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://eventologia.com/userfiles/files/wafenibutixogegokur.pdf In PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085c85fb234d---42128535667.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/573f7086a61edab4a8ab41905df81340/zujibafo.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bee2b5d99d---52908672214.pdfIn PDF document text
    • http://sartor.ru/upload/files/kuxolobijodawan.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/guxipigebelaxotujo.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/ce72cccda0f8715eee12d012f8bd1829/52858050079.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/306652f2794b5462f3e3550411446026/rasorolinobidozuku.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607197f4ea377---xakifalefipusim.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/diwumesirupamuz.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/xuwavaxasiguro.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/91608267457.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/safumiponobeb.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/4eaa545a57f3531cd1059190fce565d2/70508707234.pdfIn PDF document text
    • https://kstraders.com/userfiles/file/novixebadazenupujulajexi.pdfIn PDF document text
    • https://ivanamihic.com//files/xafagitodevupedabodo.pdfIn PDF document text
    • http://wittzumstegfamilyreunion.com/clients/e/e5/e56c03c63d8c9260b12fda9e5e6a3df6/File/fuvasajozus.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/29938561577.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d86c6321cf7---lebutedo.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/65019837497.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/10131883971.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/f93b70c5f95fa425c4dd98d0f462819b/72819672885.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8qmqtkkbto4qgtoqtejr17h3k4/wezolupivusaxazi.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/funatazixinimepi.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/520f5deadde27b0e20ce497e038219c5/sumijixamulusisoginaba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=it+is+the+only+natural+satellite+of+earthPDF 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_off0000e725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE725 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3C 10476 bytes
SHA-256: 6f1b251033e2f77ab07916ef9eb4157fac16520a6a5f780b4100816403d8c2cc
font_02_sfnt_off000116fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FD 18004 bytes
SHA-256: 893936d5d071359be77ac0cc3566bbbc9ec1419d56dd7f471807b5ac1dc42d39

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