Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0453512ffea4a46…

MALICIOUS

PDF

86.7 KB Created: 2021-09-06 19:18:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 755dd4bfa6450436aa70ccb7f17511a4 SHA-1: f8fbdb781bb0e18cdb2fd7b777e5a623855e0f7f SHA-256: b0453512ffea4a46d01e3f6e41f22e41725f7341ad75a1185cbf5bf785f04d32
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external URIs. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded JavaScript likely facilitates the execution of malicious code or redirects the user to malicious sites, while the link farm on compromised CMS uploads and disposable hosting serves as a lure. The primary purpose appears to be directing users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://ketchas.ru/uplcv?utm_term=hcigar+vt75+manual PDF link annotation
    • https://pointvirgule.ca/upload/editor/file/89098605200.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/94558589601.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/feminanosor.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16077572a02ad6---xirulomopegipugusu.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/kixosubi.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f5876682---35910758714.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/vobukug.pdfIn PDF document text
    • http://togetherwewalkny.org/clients/2/24/2411cc079aa0f0d7fd57f81c6163ecfd/File/75701913130.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/fufeksq8634dtgusfsu1ra9oj5/12802119356.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16121bdb463748---dokikiriborudupivafom.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/46228170556.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee0e922d35---siwafepaxaxavojedep.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/79720163177.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/watovanidukutitadotekapi.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/4650450815.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/38893803947.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079687edd5a9---19770359852.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160767b21694ba---wisesu.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/38053367979.pdfIn PDF document text
    • http://alptw.com/images/files/43318044494.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/lopitugawekakopewizagumov.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/nigu0osfv70fetqpbjns71b2u5/1169925980.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_off0000ee7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7E 10496 bytes
SHA-256: 62b89883abeb01ab4ca7bfe8b607111031d9fb3f6b1abf9a5b6151381a7fa591
font_01_sfnt_off00010662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10662 17956 bytes
SHA-256: d28e605805716eae3a848001b3cada16f6c75abf916cf6cde0ed1ad8509513e0
font_02_sfnt_off00013565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13565 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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