Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f759666e943da0d…

MALICIOUS

PDF

75.3 KB Created: 2021-09-02 01:07:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 150c9c4c83b5e2206c04a74b9c8b3942 SHA-1: 0c0436b6e0175b9b297c0db942ee54691e8abc19 SHA-256: 9f759666e943da0db6848b64faefabc6927440d3e66d57ac38a70b4fcfef651e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm, with numerous URLs pointing to compromised WordPress sites and other domains. The ML classifier strongly indicated maliciousness, and the presence of multiple links to potentially malicious or SEO-manipulated content suggests an intent to redirect users. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://sewakendragroup.com/userfiles/file/83232781557.pdf In PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160deba1ce2b16---legonikataduk.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/3dkhaj2g78bu38s9n5b9m4dg86/59332587775.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/28503808356.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/hhlt333amdplu38dmc5v6qsv8q/bidiliwuke.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/rasovodikujibumijidom.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/bd795687b8c83f73c562628c62e3e1b4/birigekederivotom.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/zulezogu.pdfIn PDF document text
    • http://citra.cl/userfiles/file/95135343626.pdfIn PDF document text
    • http://cke.hk/userfiles/gazowarezedabejoxi.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/9sb6l83ke3d34c9135js764ar7/99745671168.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/634uqv9pcefslhef7sb8sa3qq1/xidumotamo.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/cc78fb66bb4f5fedc63bfa236d1f39ba/33932841936.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/37014979653.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/43050074965.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/44851741502.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c3edc913d---tokimeminixede.pdfIn PDF document text
    • http://newo.ru/files/files/mosaparuwugidufoz.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ca08dd28b---susenawesenok.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/90635713923.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/73636229294.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/s08kp72v1a0cretnavo9jmbvlt/66243688017.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9f5a3ec1c---rezimamabazowubekinus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=68k+after+taxPDF 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_off0000c1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D2 18672 bytes
SHA-256: afbdefb302c8cccda8b654f4804218c9e32c7dd81542d38ad89f4edfc7b96ccd
font_02_sfnt_off000108f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F0 10148 bytes
SHA-256: 64b29c19ab6781cd1a2983ff0ed42a08ad3a97ff684b8fbba9eed5ebafc48622