Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebbcd0cbb575f6b1…

MALICIOUS

PDF

108.0 KB Created: 2021-06-27 15:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bdcb35f63f5751cc0ccd6c2f15346d6d SHA-1: 91422f0f70f450600e2e3a1d326aa707af1c7abd SHA-256: ebbcd0cbb575f6b16eeef21195bfe834e87da07f02f840afed901d324ab5b211
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of embedded JavaScript (T1059.007) is a common technique for exploiting PDF vulnerabilities or initiating redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9639

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://newat.ru/wp-content/plugins/super-forms/uploads/php/files/6db3c8ece72ef022d2d63455df2d4d33/ludewimupimafuvux.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/afplck400atgihh0euofl0fh7o/xikurinapolawazadusanu.pdf
    • http://orlickachata.cz/files/files/vexosamezagerixu.pdf
    • https://lesura.net/userfiles/file/41201268032.pdf
    • https://adepotcustom.com/UploadFiles/file/20210429195137140.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee17fd2e83---32636228335.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6e01c4119852fefdb24aca74d7eaf7f5/99628208188.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0575722f1f---89050474224.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/258e4fecff92a3f843768a0bd8bc3e05/56681519626.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b325cf188---pafafomedenisip.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a672d4cdd2c---xexexarulaterunopafeze.pdf
    • http://botosani.ro/img/uploads/file/5716688352.pdf
    • http://wchs67.com/clients/f/fd/fd50fd9748f3592dabdfdad26f378f15/File/xuvuxiwibak.pdf
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/81749220149.pdf
    • https://alnahamgroup.com/userfiles/file/lepafot.pdf
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160abfbe68e390---sezukopezurebenebadusamux.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/pr84hl9s7bmehokm53fsm2pb55/53410907688.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f80932e9b---26432981779.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/d4fad1d6335d9cf7c0fa0f4985815bad/dojedipaluxakivusajiroje.pdf
    • http://gursakaryahukuk.com/images/file/lufejibor.pdf
    • http://adria-ex.com/images/blog//file/mazipazupibiwatoza.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/9176e430bf24e7954de88cbb314edb26/rolarabudokagogabegaxej.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7198dd5841---65571006847.pdf
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/8baa686dfbe597796aaa8e5af832184c/mokinudimilovonitusemad.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e566b6ff8---bizoramugaxibanovutawo.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a241ba9412e---95411443740.pdf
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/21062108321538401466mmi7.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=captions+for+pictures+of+yourself
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012a98.bin
6a0f6ea90456bab926bf8976d6cf629827fca4303265c60353a1d22101bde509		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A98 16512 bytes
font_01_sfnt_off0001419e.bin
7c43f695e7f8e4bd842d88f632acf58608fad380dbd48f34730ae2c7d4c02636		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1419E 18128 bytes
font_02_sfnt_off00017114.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17114 16792 bytes
font_03_sfnt_off0001892b.bin
133a991644f25fb3e0785b4b089821b25785f202a6c416e2462ab93fa3f9a268		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1892B 10716 bytes

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