Malicious PDF — malware analysis report

Static analysis result for SHA-256 36e760d9ce4a8b96…

MALICIOUS

PDF

89.1 KB Created: 2021-08-11 07:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ebb72c64131075e90bb1a793a076e0b6 SHA-1: 82dd4c107d2b8c70abe2109e1b3c60b7f6b2cad9 SHA-256: 36e760d9ce4a8b965215091fcfd8721a39e3afa88bc847c710d4f6b6629860ad
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains embedded JavaScript, which is often used to download and execute further malicious content. The heuristic 'SE_INVOICE_LURE' indicates the document's content is designed to trick users into interacting with it, likely by posing as an invoice or payment request. Multiple URLs point to compromised or disposable hosting, suggesting an attempt to distribute malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://mediaskills.rs//files/84443477683.pdf
    • https://srmhospitalities.com/images/bulk_images/files/kabikorokoveta.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105f3f100c28---74894915131.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7d1ba97af---74324961052.pdf
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/39177260762.pdf
    • http://goref.ru/files/file/wevegejufaridapusik.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/7951cb7527e3557c1781b13f81f28a9a/sujajagesoxomidaxo.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb6b775c96---87837767362.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084279785ec2---99562768983.pdf
    • http://stevis.cz/files/file/rifawarivad.pdf
    • http://avtokapriz42.ru/userfiles/file/denujonifenaf.pdf
    • http://mtcnx.com/upload/fckimagesfile/jegareguvusemuvam.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/asjvocj9o53snsa8k82klg84qp/4189628958.pdf
    • http://langeline.com/ckeditor/upload/files/ditid.pdf
    • http://giasuthanhdat.vn/Images_upload/files/56233517386.pdf
    • http://happy-travel089.com/CKEdit/upload/files/24036178813.pdf
    • http://carnow.jp/js/upload/files/72654682574.pdf
    • http://aisef.org/uploads/userfiles/file/file/lovasinibo.pdf
    • https://pakistanchristiancongress.org/userfiles/file/45933859526.pdf
    • http://drthchowdary.net/userfiles/file/fifir.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/f3955cb186ccdf1f2fee9d5e27df7c57/85846164499.pdf
    • https://samarpanbharat.org/trila/userfiles/file/webexo.pdf
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/75302531999.pdf
    • http://byty-pardubice.eu/UserFiles/File/tomananopejit.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c60d769e67---15760824648.pdf
    • http://primehorseproperty.com/userfiles/files/90462022492.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+create+a+petty+cash+book+in+excel
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7d6.bin
c8cf5af45c4169cca7d4e4429632a6ef7ac60ffc9eec991c35c71a51ddc4dbec
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D6 17276 bytes
font_01_sfnt_off0001244a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1244A 16792 bytes
font_02_sfnt_off00013c61.bin
3423a5c24803986ba167993cbe040dd598332f610a884aa3b8074ffa9b4dc10d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C61 10996 bytes