Malicious PDF — malware analysis report

Static analysis result for SHA-256 25b31a82f6f6957c…

MALICIOUS

PDF

84.9 KB Created: 2021-07-30 07:21:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e7b67d41b29f25f14e3f7422bb413286 SHA-1: 445e59edae896c4fdba6417d7366b6b0f797130b SHA-256: 25b31a82f6f6957cb8d20e68f46508bd29871e98365850b501d42586ee3bfd41
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites used for hosting PDF files. This suggests an attempt to distribute malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160762d506a28f---namafokasanuzeniru.pdf
    • https://dp-engineers.com/admin/userfiles/file/96068236294.pdf
    • http://sangiorgioautoservizi.com/userfiles/files/14576186561.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/68039ce4d76706eefa70bf30dcd12d32/70702904694.pdf
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/maritowek.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5863d823da---20062226778.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/25febe3eee5ca5aca16144d77e9c21ed/jawabaloxu.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/2tsa8i0di92rv134u0dijp3kg7/40720704480.pdf
    • http://technoculture.cz/admin/upload/file/31395425692.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ac61a02b1---99745276070.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/d5c12d0893df5d413f13b06f62e528cb/20948544147.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609482a346e3c---xudukutul.pdf
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/31858836830.pdf
    • http://symbioticlifetech.org/attfile/fckimg/file///2021070245123_814150053.pdf
    • https://isosklo.cz./uploads/64348048162.pdf
    • https://schmitz.cz/res/file/74166781280.pdf
    • http://www.aluvascientific.com/UserFiles/file/jujusijigeg.pdf
    • https://secolink.sk/userfiles/file/29725319783.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b91f6d7a29---99595138749.pdf
    • http://textingrights.com/userfiles/files/zixodibibep.pdf
    • http://krevue.cz/UserFiles/File/pabewedaxi.pdf
    • http://vogiantinhmach.com/media/ftp/file/nimuwifa.pdf
    • http://iglozawiercie.pl/zdjecia/file/88701282862.pdf
    • http://maslag.eu/userfiles/file/popepebifudevuzarin.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=lvl+7+script+executor
    • 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_off0000e984.bin
2ea56380c096c3472cb6843f30e291b655463e4f6c18f4a7de1907581a120e3f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE984 17036 bytes
font_01_sfnt_off0001162b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1162B 16792 bytes
font_02_sfnt_off00012e42.bin
46a26c1dd6c8c91c4e099b1b9e2c9013c8b5a18a31ac1e6c0c623d1d89dcb6e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E42 10376 bytes