Malicious PDF — malware analysis report

Static analysis result for SHA-256 817403f714a920d6…

MALICIOUS

PDF

82.3 KB Created: 2021-10-18 18:31:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0d34ebb79c80bc57fd01bb333a17f4a5 SHA-1: c5f8c0fa8344fee888788bf16a0c8ce2c2ab90f3 SHA-256: 817403f714a920d6bbecd6738b9f1a82a18c79580b9959cd296aa3b917f9795f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The document also features a link farm with numerous URLs, many hosted on potentially compromised or disposable domains, suggesting an attempt to distribute malicious files or conduct phishing. The presence of embedded JavaScript and multiple external links indicates a multi-stage attack, likely initiated by a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://burningspearmarketplace.com/js/ckfinder/userfiles/files/21247682467.pdf In PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/hebuh9te4b22aickh7h3j61l96/lotoremutajefusexiza.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/sadeb.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/lixewud.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/kazajedaxo.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/53758297774.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/pokosifizus.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144f50b26102---mikan.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/burasunadeg.pdfIn PDF document text
    • http://tajilin.com/upload/files/pinit.pdfIn PDF document text
    • http://learningkey.org/userfiles/kutuduvajezuwotav.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/wuzefazedipuronujefejiliw.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16165aedf4eac5---12120185116.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/44231376685.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/72453487425.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/xiruvevuwupi.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/88830246238.pdfIn PDF document text
    • http://slr-eyewear.com/slr/userfiles/20211011041540.pdfIn PDF document text
    • https://pt-lb1.pasarantogel.com/contents/files/sagegogunifokimofipukilen.pdfIn PDF document text
    • https://gosselindesign.com/images/from_fckeditor/fichiers/xoferam.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/2035463236.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/90101523706.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/82321955044.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/23D8k0Ec_6w/uplcv?utm_term=security+monitor+pro+6+crackPDF 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_off0000dc8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8C 17564 bytes
SHA-256: 31fc0c09d111886002ced88a54a2a190886311dab0aceadc764115011e682528
font_01_sfnt_off00010a0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0C 10868 bytes
SHA-256: cf7db06de22325d2def5cc3b3c37e6c32db53a1de506cd706d175b880378e6a2
font_02_sfnt_off0001233a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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