Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fceda58a3e6f9d4…

MALICIOUS

PDF

71.6 KB Created: 2021-09-06 00:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3565468c47bca078671712b51d34a102 SHA-1: 6c21a6a1e685545e16d4fa3862163f9e087f9889 SHA-256: 2fceda58a3e6f9d4a119dc74264da2b9fbc43e46f883b86b8d371a6341833889
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple compromised domains, likely intended to host phishing content or further malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://pistant.ru/uplcv?utm_term=cs+6303+computer+architecture+pdf PDF link annotation
    • https://eliteplacementagency.com/uploads/files/fevudibivezonotori.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/936e2c3cef9870c95222e709c8ddb9c9/dibewekufikigopise.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/71639781433.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/tidalogegeximirufamufudu.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b736864a5f7---87691916251.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef7a76f7e2---lirupebi.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210503211518856753644.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/92050643819.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/38193285222.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/luwabikudotedifiwi.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/75245947901.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/zajuxivof.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c55ee4a7c2---zatawibetexedobil.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1606f11558951d---panezujeratabofivesavabo.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/7837850916.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c94dd00393---55813084765.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/1kdtnbl5ac8hj6uhql2ptptulq/gegudizifisegogos.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/wigifulobapelelesasuvilol.pdfIn PDF document text
    • http://446888.top/userfiles/file/jupobugexiwejovokokuga.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160708c686a57e---kiwagakukatilivazojapigit.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/45551092447.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/42176223352.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_off0000b5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B3 11328 bytes
SHA-256: 2e08b728a842cb9897205fc28edf7a66958c7d9b6f29dbfce506753d597b5060
font_01_sfnt_off0000d053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD053 16104 bytes
SHA-256: d73ef59fda7edbf4d3e41e10178f38dfb8a126643022e87bba3bcb1b8796809e
font_02_sfnt_off0000f91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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