Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3609e85ffe09ba8…

MALICIOUS

PDF

81.5 KB Created: 2021-08-21 10:41:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5abd6f19ac96d42060cf5e9d2ba94e0f SHA-1: 2217cb27d344bc65bbfcfb45653f054bfee0ab29 SHA-256: c3609e85ffe09ba8fb68ff699b78dbfba74c633ff0122a5436de24bca1a9f071
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and link farm heuristics points towards an attempt to exploit user trust by directing them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/ho7uc4ek7r478ld8ns8ftacavf/tuledomexovesafad.pdf In PDF document text
    • http://xaydunglenguyen.vn/upload/files/37c5bd.pdfIn PDF document text
    • http://vestmorecapital.com/images/epost/97490531180.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b86a4897c2a---rapuzadufon.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/zinonetugibenan.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebc675a7f0---76870469680.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/6ee90ce6f6a568bc8ae6f50d4bb7c295/42471296721.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608951a8695a4---lafariwegoxinajigetuzotej.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/9dlop5cs50s5bifoq3fj0pv37t/90218880700.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/19606676338.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/66707584590.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/meliwidozi.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/2f339a453ce5d354945485562137bbb7/28362212439.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ce98552c8f8---jukedolasezilolubadez.pdfIn PDF document text
    • http://biosite.ru/images/news/file/dolonureluviderasulu.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32a7ae9bbc---71483879709.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/towirosiwevupenuxizudoka.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607857e3cc641---63671265709.pdfIn PDF document text
    • https://paperland.bg/uploads/file/35205342024.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16104ed0998fd6---16379409916.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7aaf2fa10---xonojutuduzosubadonupo.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/cmrmjhpr1fnos6ok7iplimbhn0/gidetew.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/dukewagotujozuzetogedisil.pdfIn PDF document text
    • https://gilbertems.com/videos/file/fupipafiwala.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=palabras+de+condolencias+cristianas+evang%C3%A9licasPDF 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_off0000d9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A4 17096 bytes
SHA-256: c62c5df426cb43d5c280d1c3d0042865ad02eec9781cab08ec5e74382fe2c77c
font_01_sfnt_off000104b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B7 10908 bytes
SHA-256: b08758a4c43f4073623a65b411e289ea9f48415687a06e091a6f7acde6c91620
font_02_sfnt_off00011d96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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