Malicious PDF — malware analysis report

Static analysis result for SHA-256 2402b78f2f47fd2a…

MALICIOUS

PDF

102.2 KB Created: 2021-08-03 19:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f61dbf9487d709fd1c282602fcaff6af SHA-1: daf0b901509c133913c9e843b076d4d4a1952b68 SHA-256: 2402b78f2f47fd2a83a68e35d1e91b85e52a20f1a46c63b549078573c64f85db
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF_JS heuristic indicates the presence of embedded JavaScript, which is a common technique for executing malicious code within PDF documents. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely redirects the user to one of the numerous URLs found in the PDF, which are hosted on compromised websites and disposable domains, indicating a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9879

Heuristics 7

  • 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.
  • 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://espaciocultivarte.com/ckfinder/userfiles/files/wutuzesudojalazurokite.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b02794146e8---74544518589.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/7tdoqe1t88okpthilfo6ojddl6/24417583010.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/acd9717f06cf6b4a046ad26c48a28869/64567898719.pdf
    • http://shinies.ru/img/lib/file/polupefasute.pdf
    • http://alnoorcity.com/userfiles/file/11924117813.pdf
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/nakafojoxifu.pdf
    • https://brahmagnanam.org/fck_uploads/file/mawamolo.pdf
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/5f8ea4b51357396f25f3298b7b024da4/nimogikobojemafizebid.pdf
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210510090120413076ltc8je.pdf
    • http://madmojo.com/fckupload/file/84378048145.pdf
    • https://parokisantolukas.org/Uploads/userfiles/files/busufomifutebizovu.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/55fc90970b7defd10b68eea74b1e51fd/54691124201.pdf
    • http://stlnsk.ru/uploads/file/zonerigufelibike.pdf
    • http://fitviewer.de/files/file/9818178776.pdf
    • https://t2sc.me/userfiles/50716332130.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/f4e445f51ff9e7c0ae806f74384c8d16/folenesozazone.pdf
    • https://medius.sk/userfiles/file/5508432166.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a08f9487d---nejanukavizevifenakesexup.pdf
    • https://proektasis.gr/admin/spaw2/uploads/files/81888120352.pdf
    • http://forglass.sk/userfiles/file/67534775860.pdf
    • http://alexlunacoach.com/img/editor/file/39801308292.pdf
    • http://polymer-optix.de/userfiles/file/rofitaserovajuguru.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/3uimjpha8bdc378icqb6ii7mb2/kenewiwipegepulesezanad.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=what+to+say+to+alex+stardew+valley
    • 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_off0001167a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1167A 16792 bytes
font_01_sfnt_off00012e91.bin
f3117872778debceaaf4ac5436bfadedc6e927586bb4c4de6e31d17442b45689
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E91 10512 bytes
font_02_sfnt_off000146c7.bin
6ef7632f1b78126619bc6ad4a9f405dddb464dbe4d818fabdb6ee3b74b4834d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x146C7 17156 bytes
font_03_sfnt_off000173ae.bin
0cc027001c9aca00ad2b5488f330b286d077e5f3adffc44559767cd905ad728a
pdf-font-stream PDF embedded font (sfnt) at offset 0x173AE 16632 bytes