Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef402ffca17a1baa…

MALICIOUS

PDF

79.5 KB Created: 2021-09-17 19:12:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c603a9af608a1dc4a35bdfa881ff367b SHA-1: 8b3c4835ee527b417ebef9a2ca2d1fd3589bd30c SHA-256: ef402ffca17a1baa45ec67c8d9524ca4f2e1763809759dd99ce9778c4762a619
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristics indicate that the PDF acts as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. These URLs likely serve as landing pages for phishing attempts or to download further malicious payloads, aligning with the ClamAV detection of a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://irlanc.ru/uplcv?utm_term=share+android+screen+to+laptop PDF link annotation
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/85977280485.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/58717162333.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/17227151735.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/53255655658.pdfIn PDF document text
    • http://ipceurope.com/assets/file/87621392517.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/94de1574df11301267896aae627e138d/zitapilufagixunerigejek.pdfIn PDF document text
    • http://poliinc.com/upload/files/21019045155.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/sawij.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16135808f6eb85---92678063259.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/76423575301.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/53050560102.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/dimolafixu.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/nojaledole.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/91086556657.pdfIn PDF document text
    • https://vyrukrc.lt/userfiles/file/vaxiberomira.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/geron.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/kisipavakosapado.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/27585075341.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/a1c41ed5401d92f80e24b8cda68ec350/jiwup.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/46437683462.pdfIn PDF document text
    • http://tid.vn/upload/files/gujaxuwejukaji.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a5bee8870---xiburopifeg.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_off0000d1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C0 17948 bytes
SHA-256: f43052c1853f1aa7442b7a904f0df5f243ad9c5bb990f51f2b3bfe1d164a9f39
font_02_sfnt_off00011878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11878 10688 bytes
SHA-256: 60f658b6cfbe2cb0f0d6524b42f55205b4f3b62ec65a3eaada5e635c44ad3ea6