Malicious PDF — malware analysis report

Static analysis result for SHA-256 25beac5f839d7225…

MALICIOUS

PDF

64.5 KB Created: 2021-06-06 10:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2610c4e966b84a5023fca32a0ac01228 SHA-1: d1e01fb481519c81c0a18b7471ee6d27c2039dd9 SHA-256: 25beac5f839d7225638894adb0b9bc4eeef3669bf129c567038092bdbb5e4b39
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, appears to be a lure related to a common search query. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving the redirection of users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8592

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://pistant.ru/uplcv?utm_term=can+a+baby+chick+live+with+a+broken+leg
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f28762bb6f---xitaminimenizugoxefim.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a619a01f2f---gewiziselinude.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160adb63c62618---64140048837.pdf
    • https://luminex.pl/upload/file/womudadabijevexiz.pdf
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/juf9i4p4rcjlpu7ujutv3v9d2m/lawalimafu.pdf
    • http://hutergroup.de/userfiles/file/durixadexexanelanowenave.pdf
    • https://psychologgia.pl/Upload/file/gulofavekoniza.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/d8glcmgblsdf4ivmnk3h5dl13f/pekefavedaxoderej.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/26e0bf574e058934aee7531f249e35bd/sakegatevapuxo.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608026543f5b9---99346126594.pdf
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/a1c811d17997e2bd9bd99561ab3aeda4/73956542046.pdf
    • http://hytechplus.com/userfiles/file/tofuseraxoworulubi.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160919ad825444---48352471074.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9ra1hgo1njekf6bj8eaqmkn033/33132314194.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/vo417k2ont3jt67kj3i1pa6o3t/sexenuvimipanotimotom.pdf
    • http://azizolace.cz/images/file/zurofiwesajuwaximav.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d201.bin
f3b7ba4612edf75aa7825a220ed0365626f3afa9742456478be684504144e76f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD201 5152 bytes
font_01_sfnt_off0000e39d.bin
c927b6202fc8850609b0ad9fc8fc55fd88734e1961c28b835326b97235c6e5eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE39D 10228 bytes

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