Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec9bb4eaabaf0c86…

MALICIOUS

PDF

96.8 KB Created: 2021-08-20 11:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 94a5145d13b2c0e1ad4ecdf133f3a73d SHA-1: 2e88a89fa58f10a3bba71a298f8d5c26e3e6f8a4 SHA-256: ec9bb4eaabaf0c86187b9c0e1be015c6d74920015c47b2f9a1a3a19511aa1069
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains embedded JavaScript and numerous links pointing to potentially compromised websites, suggesting it functions as a link farm designed to redirect users to malicious content. The presence of these elements strongly suggests an attempt to deliver a second-stage payload or facilitate phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/ef41612f2b90e355643276ac0e6c2cc7/32595214852.pdf In PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/0b65b1db971718fd397bb4c31df0cca4/bururekiwofik.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/zubiwexarefob.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/3979093157.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/9c5c6d5b1ab4ee09b7c07cd20118daf5/favapijenupiz.pdfIn PDF document text
    • http://huntland.hu/upload/file/dotalelutobixadumujoxoto.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/loxedala.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7692965fd---dutijixogozetize.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/89d169d2f50ab856cb221eae261148dc/dodexox.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/lokapejelilokaki.pdfIn PDF document text
    • https://a5productions.com/home/a5pro/public_html/ckfinder/userfiles/files/19702271665.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/kategituzijujef.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087a5549dba8---54425424829.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16111237a5b923---vadunetadewiged.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0a201e2f4---bisifa.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/290db96397a3cd4759b90f37f8604ed5/fagoxo.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/60005433004.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/51985697249.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/kijezekebisavofatuzer.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/wevanaratukogojijumek.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/56919428426.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=comment+calculer+la+hauteur+d%27un+triangle+rectangle+avec+pythagorePDF 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_off00010c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12466 20496 bytes
SHA-256: b5bfaf21c3e67108f7bda091442c63190b1fb7889d2e84d6dbde51c2b00b0dc4
font_02_sfnt_off00015851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15851 11136 bytes
SHA-256: 4476d9595b64967f87d1cbb7ee8f7d06370b217da93788d709c6433964f85d5d

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