Malicious PDF — malware analysis report

Static analysis result for SHA-256 78c2bbe8963dae18…

MALICIOUS

PDF

75.5 KB Created: 2021-09-20 10:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 99a88f8b1c15d49c01566dff078c4749 SHA-1: a23807edcddbce08cb06ffc0df32f9f9e249d4b5 SHA-256: 78c2bbe8963dae188034eaa8b4c5fb7d3a73fe213b35d8e951456609a8020780
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or appear to be disposable. The ClamAV detection and ML classifier indicate malicious intent, likely to redirect users to phishing sites or download further malware. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics suggest an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5631

Heuristics 5

  • 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
  • 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 http://bhk-aindling.de/userfiles/files/budipuvoximod.pdf In PDF document text
    • http://www.eatvirukai.lt/uploads/files/44360528241.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/wetusufosuge.pdfIn PDF document text
    • http://paneldeconso.com/userfiles/file/19186632528.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/vodafewutuzanebaremewo.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/78337765547.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/jegedekemafopi.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/bawupofilij.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/af0382c4bf3b802bdcffd300c27e399d/dutukuf.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/toliwiw.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/fukulera.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/xotejesub.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/86133350519.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/68812626776.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/1a15edf64cb128e32553377c1f2e01d9/mexawokubabisejulebu.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/80252553477.pdfIn PDF document text
    • https://morethancars.eu/uploads/edytor/file/kewilijeweditanurowizov.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/xibamuraluzorejutosu.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210907_51C53793E26B72A2.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5fa6ac480---tadefaj.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/wutijore.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210917005418.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/25663333949.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/zamefikan.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/zivawinotonetexozoziw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=the+secret+life+of+walter+mitty+streaming+itaPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA8 16412 bytes
SHA-256: 9df2c7635a3769b91eb6bac206b67e35508151ceb30380163b7790a9c4ca6d30
font_01_sfnt_off000108ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1