Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cf9479bc7cddee4…

MALICIOUS

PDF

94.6 KB Created: 2021-09-01 13:18:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ee559378a5a52b96009af351ca227fc5 SHA-1: fdc7a478959baa38b8e744d7a24820a0c9117edc SHA-256: 6cf9479bc7cddee41437fac3130273f342de30ce69d66fa5eebddac3f3ba2704
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. The file functions as a link farm, containing numerous URLs that point to compromised WordPress sites, likely serving as a distribution point for further malicious content. The presence of external URIs and link farm characteristics indicates an attempt to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=maritime+law+on+land PDF link annotation
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/n6lt0f50rql90788itv7ah5ee0/xigewakodumezijaf.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16095ac9c8b15e---86120518885.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afb67ed72da---97107786914.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/metini.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/2604948338.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/52933250602.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/garekipidobona.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/30323665542.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/48757683844.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/mojekopujuvapis.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087d701e50ac---89626905527.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/vovodagapesinu.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160920c2ae7bd4---ledamemaragoruweri.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/sotatasuporubavaje.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/08f08d3605a9bddc57ed7b3e26df889e/14998098196.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae63cc57cff---kebofonivofezetesogusuz.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/92969122074.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160815b22ce59d---79323408637.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/83644adf9fb34096ec11f20908ce654d/kuzafopaguzoke.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210626090123654.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/73749919919.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1043367499609c7e401ee02.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_off00010b77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B77 19336 bytes
SHA-256: 1532c214902704c1363f5b63cc5ba90b4edb6d489a8e847edb3ab1ba7c14f305
font_01_sfnt_off00013d5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15574 10320 bytes
SHA-256: bc2e1dded53884b97638c2651d0825b2133a6c0eda5e339e21f75431774c3f42

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