Malicious PDF — malware analysis report

Static analysis result for SHA-256 9400e65004afcfd3…

MALICIOUS

PDF

75.2 KB Created: 2021-09-02 07:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 376f75ee3341dee19632872f1a6edf09 SHA-1: 2e65b6c464993995875fef2ff6fe6dafe8481ef4 SHA-256: 9400e65004afcfd34cbc1e7506ab746bfebcc6670b77aab926c08b53e7f54301
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm pointing to multiple external websites, many of which are hosted on compromised CMS uploads. The ML classifier strongly indicates maliciousness, and the structure suggests an attempt to manipulate search engine results or redirect users to potentially harmful content. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • 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 http://ge-mak.com/files/57622759524.pdf In PDF document text
    • http://nutrisoilvietnam.com/upload/files/65617494506.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/52786203733.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/f4cac23b39924b9f466de5cb4b4eaa38/98236371450.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/3e33e8738993dc098f1e217ff8ffc69e/16188134290.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160820b2855d25---jivev.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202108file/2021083111230070554.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/16557277330.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/567351377.pdfIn PDF document text
    • http://balone.net/_upload/file///xolugami.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d643ded3c9---tenivomuzamolebulas.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f06ca987f---84632450133.pdfIn PDF document text
    • https://tappowine.com/file/2323883346.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbd9400b66---71482723042.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/78755482133.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/figavasuj.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987b2f7b6ab---wavilu.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/4840158780.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/25480761513.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/63291fe8ecb1d63cc4a0d731fd487ffa/47204643254.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/zimubomafomosexekuf.pdfIn PDF document text
    • http://teraval.cz/res/file/87033315772.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mopobopemikejadagoxuwovar.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/774940267.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762b9038d45---62401891134.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=triumph+learning+math+answersPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC248 16776 bytes
SHA-256: 93983512292af1315dea3db96f666404aebf5bf4c621a6b9291de58b85647414
font_01_sfnt_off0000ece8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FF 10728 bytes
SHA-256: b34c4fa88f12d88b48cd5ed02ab5969990a57b3baa630fc843368950578b6308