Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cbfe65dee9ef11d…

MALICIOUS

PDF

87.1 KB Created: 2021-06-30 06:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 83b392adc150ba6671d742ec7ecf8e1b SHA-1: c74a378af6848a385e200340c4d5235d4a67abc3 SHA-256: 2cbfe65dee9ef11d7d29da04c0dd9036dc7b1bd11be917b28a03527e2be90a7b
96 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised WordPress sites, indicating a likely attempt to distribute malicious content or phish users. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and URL patterns suggest a downloader or redirector role, potentially leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077081ac5f98---fawumijolitajenajose.pdf In PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/18c371b9be063b629a7fe0a8502a5a1e/bodusiruxasowaxilupesef.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16099ca2004b7d---tatubiniver.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/aab30230de91bf4366af12dca4d813d0/89618487604.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aae51f5f895---78642693055.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/91040221692.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/0d504437314ff800cda5991c6de358c1/fogovobifisarokugekapip.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/88729396973.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/fupez.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b693a756745---doximabawenekexax.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886eac228d9---52821167956.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/6fbeee3d99961ddef9981389e17ab15d/29426802013.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b776bd3bb42---30806251690.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/ffb4c7b902c0e996e36a9a54e6a20383/16596372316.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/8f007f58f9d45893f303e44c3788bfdc/jevoxutaga.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/tadefobuw.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16070d4b3c246c---xijizozelixawoko.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f07fe42a9d---9782943365.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/092104385530.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/wonukuposokomokimigox.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/48558115877.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16082b4c54e327---17944454766.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0be0a7b64---fuziruzusa.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/b7e626ec8d41878334b3011d5bce6a12/30922983848.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=fatter+is+betterPDF 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_off0000f430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF430 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C46 9948 bytes
SHA-256: 7bbdbefaa0239502fbb003ba73f2dcb80f85038c46cfb0f1473b8fee49fa36dc
font_02_sfnt_off00012269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12269 17320 bytes
SHA-256: b228dba1aa8620b04caaffc3cd90e971cd60bcbd5af9c0b92a71aac71628e6cc