Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cdba4e7f3699dfc…

MALICIOUS

PDF

179.0 KB Created: 2021-07-02 00:24:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7468d638fc474659ef85d3be30efdaee SHA-1: b98bfbc42d93185afc62f677ed8a4b7fcea09b29 SHA-256: 0cdba4e7f3699dfcb21380a7347ca053d63068f93817d98166024a2cc3a36422
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • 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.
  • 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://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/15e562e826cfaf18188b3b5cfe900706/58173128194.pdf
    • https://thuaphatlaihanoi.net/uploads/files/xakozitizokigas.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/levg9in2dp32jps1dal30r9ih3/guwikabina.pdf
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/hrf5fj595rlb4ma0ln5jg31fe5/bezebebupabarajo.pdf
    • http://eraucheta.ru/uploads/file/14061637974.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/47a3d7ea9d015fea56741292188012c7/gomivilubawelopusu.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/be70a521febb85696ec1bf48579d1d68/38156686877.pdf
    • http://cokhiminhhien.com/media/ftp/file/vafafazosotumem.pdf
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/jusodafusubenoraxirofided.pdf
    • https://fzclicks.com/demo/files/editor/file/31519694191.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/163eb77e700553946af0c91821895e08/mulakavi.pdf
    • https://feldmann-spedition.de/pics/userfiles/file/buwudotamu.pdf
    • https://ferado.vn/userfiles/file/gekujikuk.pdf
    • http://pro-group.ru/userfiles/files/43383219180.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b59973872ac---27022084021.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/c6787909d0f9a879665125b154fcafbc/limojerik.pdf
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/7g68qn13hf8qt55trucc9jj4qh/69701911036.pdf
    • http://fszhenjia.com/upfolder/e/files/20210619105714.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/96d903f9a6a56e0692447315d6c1149f/woxijusivure.pdf
    • http://fouladsazanco.com/Upload/file/86522902550.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812223252e2---temos.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e654e9f5d---wazoxajodiponesewolos.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac545c4c276---wafibididu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=concise+dictionary+of+middle+egyptian+pdf
    • 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_off00025625.bin
350c97c4efd881fd5e938f7a2b2257d8724d2a551a226d303725b2a9dd940399
pdf-font-stream PDF embedded font (sfnt) at offset 0x25625 11108 bytes
font_01_sfnt_off00026fe8.bin
b55bb089e2613370ed55b3f17a518b5f83ef1a919ffeb885973c82ef7c7f9656
pdf-font-stream PDF embedded font (sfnt) at offset 0x26FE8 22172 bytes
font_02_sfnt_off0002a622.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x2A622 16792 bytes