Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd65e9a7fcfaee34…

MALICIOUS

PDF

80.8 KB Created: 2021-09-06 05:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ee2c09fcf1370c878fe772e884a53307 SHA-1: 85934f9b17af9926a9ea98f0f3f37f2cbf6b4431 SHA-256: cd65e9a7fcfaee34f01a2aa5d78052e8d431ec80eb7ffb5bd4418951490cf609
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicative of a link farm. The presence of embedded JavaScript, flagged by heuristics, suggests the document may attempt to execute malicious code or further obfuscate the redirection process. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware delivery via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://liburnia.pl/userfiles/file/62017563085.pdf In PDF document text
    • http://faradbox.pl/files/file/27612233517.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/93673558587.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/82096764874.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/01lco0o2381vcivtec86lba131/mozexizalemibudit.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/42870697206.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/turirope.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/napajukewu.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/vuvorejiki.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/0jf4eoqhnlbc6ec7h725nnbhi9/39517301634.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/0af7fec9734f22e87c97a8fd0a981871/sogemovegas.pdfIn PDF document text
    • http://bio86.fr/fichiers/bivamobudoxeteforotozom.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3d6a05198---41721976647.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/33730187163.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/d9ae790d020ca49e0dcf8c9ec44ecf87/44343032273.pdfIn PDF document text
    • https://cargobull.cz/res/file/82691491331.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/ju1i7p7t0mjorh0msle0pium43/xufotuke.pdfIn PDF document text
    • http://vendingchat.ru/uploads/ckfinder/files/nutesavojozewaxepuber.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/deaa04064e6d7093c5a6537589aeaeab/37615437190.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/63f1bd2397d1683103947768114274f6/viwevuzinu.pdfIn PDF document text
    • https://grancom.by/upload/docs/pinadenoge.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610c3578bb67a---94947761763.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///39253666660.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/kiwun.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/xemotezobeladir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=thermal+energy+calculations+worksheet+answersPDF 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_off0000d6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A4 17376 bytes
SHA-256: f2d151a0309b3a7f8e64fe8dd49a9bf5d92edf813bca1774a74b4d02dadc557b
font_01_sfnt_off000103a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A3 11032 bytes
SHA-256: 856c119cff2903b81408c1b81734bd5cb0a9f0c1a845d9ae9ae5b819c58d6122
font_02_sfnt_off00011d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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