Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa941f2a8cab9cb7…

MALICIOUS

PDF

82.8 KB Created: 2021-09-07 03:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: da6cdaf62dfd2907de12e8e375a8c02a SHA-1: 0ed03b23a089c3eb68330f5944c27446c58a19b9 SHA-256: fa941f2a8cab9cb789ee3fa075f99bbdfd42a8fc0cf95284802f9fcc91d9130e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is often used to redirect users to malicious websites. Multiple heuristics indicate the PDF is part of a link farm, with many URLs pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://laborke.ru/uplcv?utm_term=hypertensive+crisis+pdf PDF link annotation
    • http://autoscuolepintozzi.it/userfiles/files/bumevuwovoteretabu.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607153274cb95---pamodizipukonowonuwubo.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160968d0a4b01c---tabimafumuxisosugiguf.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/91514492437.pdfIn PDF document text
    • http://deborahbrown.us/clients/860103/File/tavabuwujuwuxuju.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0fa58031c---36805095729.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/zebubenonoxopaveva.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/xileze.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/4c6ce493b5ba3f9100ee096d9179261c/43962946672.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/os4mc6dfglte78te3dqhegh3p3/47542251276.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/0mljtop40arh5vsr6vo796nbao/xoriwerijizexiluk.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/81270180128.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/a1cc62ab57f9425b827699d427d0ff3f/99132356228.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/6458118f6a615bd933bae1bba69f2a9a/dukujesusilaxapomolokaw.pdfIn PDF document text
    • https://cmetrix.net/ckfinder/userfiles/files/tuwijoruwekepapetupa.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e55b175827a---ledebivifakofobo.pdfIn PDF document text
    • https://olterus.info/contents//files/nuvuzubikedikakezapok.pdfIn PDF document text
    • https://hoalavender.net/upload/files/70736098896.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/tifavexefuviso.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/dunebixisufajulakaxeru.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/numojidumo.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/dumatixosezoniv.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/b805bh6qnj5vstgunip5ptadfm/21663307628.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/11562753204.pdfIn PDF document text
    • 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_off0000e2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E6 10456 bytes
SHA-256: 41021b2762ec4bf8c5e268f2671c570bace6436786a7b0688d2dd294f301ff5c
font_01_sfnt_off0000fabf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABF 16632 bytes
SHA-256: b6e79514b5400be4aa576c01ebc13081e1bb058ed2d679a2c62d7c2828daeb55
font_02_sfnt_off00012607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12607 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1