Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1b756eaa30ec6f0…

MALICIOUS

PDF

80.4 KB Created: 2021-09-18 07:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5120fcd3aeddeb6f6db2737373a4902c SHA-1: 210cce4716f2627ae3362f9a88885a19ff521da8 SHA-256: e1b756eaa30ec6f0d1a147a619fe8f19325e2feaddd6f484bda5417ee64f4675
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as a malicious PDF by ClamAV. Static analysis reveals it functions as a link farm, hosting numerous links on compromised WordPress sites. These links redirect to other PDF files, suggesting a multi-stage attack or phishing campaign designed to obscure the ultimate malicious destination. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate an effort to manipulate search engine results or tracking for malicious purposes.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4747

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 https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/67a3c95319a138540539861a3935c77e/doxezuziluxagikijedanopuw.pdf In PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c50bedda8---26200584727.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d24e36114c---fowozu.pdfIn PDF document text
    • http://henca.com/files/details/file/wujoluwako.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/kumijopubemokare.pdfIn PDF document text
    • https://rinducm1.com/contents/files/zalalanadamenidezemepofol.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/52ba0cefc3b798cab86208428b339ecc/lanomef.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/88ckt5dmeu7ic49riglovcjkb0/97136272190.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/68659244560.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/38761002909.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/3124231183.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/90963057410.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37618026161.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/jerufitebeligagominavi.pdfIn PDF document text
    • https://ganport.pl/userfiles/file/nozazinazu.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/93442327970.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/94513419589.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613253ef03d3a---77215423782.pdfIn PDF document text
    • http://maxbrio.kr/files/files/jitinazirilaturife.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/61001936091.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16137d0cd3ec36---xokajusopo.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/fufigapugenixosez.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/eeef8a8915073642a657544f99cfc409/pobofimafigokifele.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/98423532215.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=amazfit+bip+lite+watch+faces+downloadPDF link annotation
    • 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_off0000e4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BF 11052 bytes
SHA-256: da093671fff017107093f554e69ab521909d32426b070aa282922cb2b627f205
font_01_sfnt_off0000fe30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE30 18728 bytes
SHA-256: 769ba1e8d5eb87d1151c5e520e6c9f34eaa21be862faa7a68c7f1478ace3fe24
font_02_sfnt_off00012e4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1