Malicious PDF — malware analysis report

Static analysis result for SHA-256 71daa6c5b7d82a3e…

MALICIOUS

PDF

93.2 KB Created: 2021-06-26 21:08:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ed8248a6dee3e217a6d64837533a3511 SHA-1: 978535de531984a17b5d9a2b37ec265ccec4f1fc SHA-256: 71daa6c5b7d82a3e477e479a0331bc7fbf07ffe40423866c7c693c17a506f023
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a fake CAPTCHA prompt, a common social engineering technique to trick users into clicking malicious links. The document body is heavily obfuscated, but the presence of numerous URLs, many hosted on compromised CMS platforms, suggests an attempt to redirect users to malicious sites for further exploitation or phishing. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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
  • 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://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/9efa2c2277838748a563bf3e65c4f72e/68877345902.pdf
    • https://miguktour.com/FileData/ckfinder/files/20210619_1BF309BB974B283E.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609452470569d---56149399079.pdf
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/raxizuropugogi.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d33ca28c5f---woliledexalegetukezoxim.pdf
    • http://edu-family72.ru/content/images/uploads/file/fosizekulakubuvuwu.pdf
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/77b48e5d81bdba79ce1170272d65014c/56734992630.pdf
    • https://briljant-maleri.se/UserFiles/files/95452231948.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085ecc6386aa---29039362198.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8ea3f2eaa---96403518876.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/djqk0kfafvg436h3t4nksi0kv7/39148683294.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/3f4750ab862286eb706fb1e62ee2268f/47021937878.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bdde787f893---xawibopovotigosinidov.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/0fd9e7d6817dd59cd3f491dc8de4cbe3/rusitevuzakeratowejiniko.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c73e6010f3---vunezege.pdf
    • https://frontlinetherapist.com/wp-content/plugins/super-forms/uploads/php/files/874dcb8d1620ddb981dd6fca72d571d0/murafugigidukafi.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af31112c26---pinefotizorajiraw.pdf
    • http://accronline.com/userfiles/file/jifaxakodakisumumaruxonox.pdf
    • http://rld-carbon.ru/file/53582952767.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bda65e27c0a---47718090066.pdf
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/ec466f98780c018148431653a9b10426/jivusirazogi.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a0d7a05a---26469431365.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/jschr9gi4k9km168l1qv5lkq34/zinosebisov.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79d58a9858---wubul.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=sonic+mania+on+android+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • 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_off0000fb43.bin
31bf47bc5589b98eb31abb2fcb39168cba3717fe0173316b9d124e693b517916		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB43 23572 bytes
font_01_sfnt_off00013617.bin
8bf0c1a96795799a11cb2476382e9c5da7f4ac317438c4fa8338a97db89bee94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13617 10292 bytes
font_02_sfnt_off00014d42.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14D42 16792 bytes

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