Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7f75b6aa7fc0d12…

MALICIOUS

PDF

86.6 KB Created: 2021-08-08 04:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d2e7ae804a2944a8e924600c0790726f SHA-1: 20a965bf7d71e9233e43438161311a415abd25b8 SHA-256: f7f75b6aa7fc0d12d6b96de84a8a67e2f49011e02aca2a5115597451aee66210
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites and other disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were extracted, the structure and URL findings point to a malicious document designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=how+do+i+strengthen+my+knee+after+an+mcl+sprain PDF link annotation
    • https://irisapp.cn/uploadfiles/fckeditor/20210807/file/16282664837204.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160859eb3779b3---64230547281.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c542f89208b---judobixawan.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/9baa7bc9a5f4fb19b0e6e9309ee6cc4b/bafewopofapozatixodebid.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160de3ed25e786---sosogesipodani.pdfIn PDF document text
    • https://ever-progress.com/upload/files/21377888614.pdfIn PDF document text
    • http://standdominica.org/files/files/762892700.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///90401742282.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609635d1c359a---tejesimexivalisowos.pdfIn PDF document text
    • https://bataretak.com/img/files/file/48053884572.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/vafuwuke.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac99ee54aa---9402438329.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a02477ad612---35624292840.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/bbbeb281f64b42a83493342f12805560/xopifesesejuxugexugimig.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb638d82cb---zaloguzuroganopepajadavag.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/pulogizenebab.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b48869371bb---67635951869.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/4429634374.pdfIn PDF document text
    • http://punaide.com/userfiles/files/83883375594.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/derat.pdfIn PDF document text
    • http://axwelindia.com/uploads/fadegetijaninasutupamed.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c5dd8c858---53467339082.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/gosezupilojegovegotike.pdfIn PDF document text
    • https://mkontakt.pl/dat//file/muloniko.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_off0000ec14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC14 11352 bytes
SHA-256: 529f6a1b6f0c1a1e41066649bb849d397f9bd6c9d4b7f1cbe3ffd0fc8854b6e1
font_01_sfnt_off0001066a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7C 17164 bytes
SHA-256: 9b4e4bdd46e06c020900020b8e8a3cbf84580843c7a732e74482cbac41514aa3

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