Malicious PDF — malware analysis report

Static analysis result for SHA-256 25fed31673a06bd2…

MALICIOUS

PDF

69.2 KB Created: 2021-09-23 18:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 10cfc4a72c587bb33b00bfd05734604c SHA-1: d8e29b59fcdc02d17c21b9c226a46ccccceaa4b3 SHA-256: 25fed31673a06bd268f4f2da4487f9ca811ea0ede99ec1b3e4a36430a80c3c3a
124 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ClamAV heuristic specifically flags this as a phishing trojan. The file's structure and URL distribution strongly suggest it is designed to lure users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4886

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=screen+mirroring+android+studio
    • https://fotojursa.cz/userfiles/file/wugugidexonobomiwi.pdf
    • http://china-baby-clothes.com/d/files/zerofokana.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/b58796cdc3d23309731954be875f9fe1/zumuzugemotabewebuvo.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd1158c276---mapefozenidowasaz.pdf
    • https://ecohort.com/userfiles/files/valorosipamedemeladufa.pdf
    • http://marchmontnews.com/imgs/file/92208363747.pdf
    • https://florissantdesign.nl/docs/Image/file/fekapaju.pdf
    • http://firmykominkowe.pl/Obrazki/edytor/file/28613673804.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ba4695c1c---lofelexivivalumuk.pdf
    • https://eternalbliss.net/file/84398345735.pdf
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/befebunugugu.pdf
    • http://tdbm.vn/upload/files/fekedet.pdf
    • http://imhkayseri.com/resimler/files/59463790854.pdf
    • http://guowangcable.com/d/files/mijoku.pdf
    • http://hajnysport.cz/FCK_userfiles/file/600151809.pdf
    • http://lorichphoto.com/pictures/file/dozubezewit.pdf
    • https://adverto.ee/userfiles/file/wikikafowexuzowobixotosa.pdf
    • http://tomaszfilipczak.pl/userfiles/file/fagazi.pdf
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/39323180166.pdf
    • https://stradatextiles.com/upload/ckfinder/files/79116039960.pdf
    • https://iuoshili.com/upload/users/files/wurax.pdf
    • http://kaies.net/upfiles/file/serawutexeralut.pdf
    • https://tempatpasang.com/contents/files/salikaxowigagesomemowu.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9dd.bin
33358b779fc46c43dbf4de01bd445f2bb4dfaf79997ceb5e4d99d43a40daf708		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9DD 16944 bytes
font_01_sfnt_off0000e585.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE585 16792 bytes
font_02_sfnt_off0000fd9c.bin
9432d7c7aa83c7e7de87a5081f6a3b1f47eb1d58b5239b13e2a59c2bf7ab9faa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9C 10844 bytes

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