Malicious PDF — malware analysis report

Static analysis result for SHA-256 a39ee4caf91f37c4…

MALICIOUS

PDF

72.0 KB Created: 2021-09-09 17:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 09080c9a6497f5fb9be7bf8fa3a315dd SHA-1: 6c30a5a70ff01c267e8bf4f4181b3389957a8ced SHA-256: a39ee4caf91f37c42e5cd4bc4071c01085666fd1f0319465bd08b7be7590c8e1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://igruppe.no/ckfinder/userfiles/files/68164405310.pdf In PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361d0d19ce7---9705586250.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/fakosejadevone.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/warenizoposaw.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/466072460.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/24123595812.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/82859057790.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/wopetaduratuwar.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/jetimezuser.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/63982648294.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/84938674924.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///tivetiripesuvorodorabawe.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/859288ki34trml0ubkfme0im91/fozavegat.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/feduwikenukodata.pdfIn PDF document text
    • https://sapporopools.com/contents/files/2835522379.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f636f092c---vufosozizibajeguwojiratux.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/wawotulitawilezufij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=nagin+tere+ishq+ka+mujh+pe+hua+yeh+asar+hainPDF 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_off0000b350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB350 11092 bytes
SHA-256: 7deedc66f24f7de4ab012a851d8d5c0ede0a6d146e275c030aaae11a5f154cdf
font_01_sfnt_off0000ccaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BC 17176 bytes
SHA-256: 0cedceb0e1eb7db86b9165b274cb9cd81614ad522d894c09166016de22822c99