Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea737bb5086497a2…

MALICIOUS

PDF

82.2 KB Created: 2021-09-08 11:33:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 44e8d5f3b57392a9ce9043732cead92e SHA-1: 4d89166abcd92d1ed9a237b7ba4b4fcc5d9c0165 SHA-256: ea737bb5086497a24ed3ab91df5711dfcb6e54c248b22c67a081073e66fadadb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many pointing to compromised WordPress sites, indicating an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The numerous links and the use of SEO-related terms in URLs suggest a link farm designed to attract traffic and potentially distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://cructi.ru/uplcv?utm_term=11th+class+chemistry+book+pdf PDF link annotation
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/b51965d992f3894c7cc5d814fab780db/90788378942.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/kukesunoxopapujab.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/2302111544.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9e54988c0---lutitefenagugekab.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a228ad0fa04---76096330074.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/pujewuromigotuzezix.pdfIn PDF document text
    • https://istihdamhaberleri.com/upload/ckfinder/files/ragazujom.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/60265194559.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/dibonanefotibelerize.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/d1tblvd9sr2498la5q7n3bhcg5/jaseruriwovigidoxovow.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0039da93f4---zemopasimudonuk.pdfIn PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/kezazividojib.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/sikukatatotowili.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/35814742540.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/16045585390.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/070317594079.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/gvgq7puchaggcvvo5dffnpbg63/tomebogegabupo.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/63147221673.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/0403d76efaf01b4f72b70799e46f57e2/43549903778.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/dafijevituno.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/zineguxinuwupomupo.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31865618166.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/41598994958.pdfIn PDF document text
    • 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_off0000daa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA3 11084 bytes
SHA-256: 51cff8a51974fb342abcf053d913d69b55a3e69ab88ace209ead8d6e5ed6b060
font_01_sfnt_off0000f44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44C 18156 bytes
SHA-256: 2396786271f1a9cfcd333cb8cfe6d4ac535ba63d839853bee5cd8560a7f97b21
font_02_sfnt_off00012361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12361 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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