Malicious PDF — malware analysis report

Static analysis result for SHA-256 2df3b77ddd240f81…

MALICIOUS

PDF

86.5 KB Created: 2021-09-16 16:34:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e3258cfbc936b45f1a0c5bcf9fe2a8b5 SHA-1: 4b4509420f722e2c452bb3b646aff819b6b4f4bb SHA-256: 2df3b77ddd240f815e54767069898e911ef02941f20356aca22688b88dfadca3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload delivery. The presence of multiple external URI heuristics and link farm indicators reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://queure.ru/uplcv?utm_term=the+crown+of+midnight+read+online PDF link annotation
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/41512977118.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/lanegezisi.pdfIn PDF document text
    • http://orthopediedelft.eu/files/kodijumovutexozoxujiwomu.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/zijizesilimopos.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/22396012867.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/73711353687.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/mg2jqu038sgaookmnodu7pb0fc/21570183121.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/c40f189de6660b47ce83bc53f0f906a9/fefusuwadavuposideguraxow.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613433d0647fb---muwisewusewabalupufamiwez.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/lelapux.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210912103326690473.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/gatolodamebawuxaxuv.pdfIn PDF document text
    • http://leeandrewdavison.com/download/zisoxakujo.pdfIn PDF document text
    • http://hmondo.com/userData/board/file/kulogotaf.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/80074237586.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/53863385496.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/67865610763.pdfIn PDF document text
    • http://arnoldbolingbroke.com/ckfinder/userfiles/files/wasugewuwopaxe.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/zatufedekixokufawup.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee34f418ce---tajuzopizubog.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-14/20210914104731702853.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137239e07723---92349719838.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/326c844e34541b6167837cfb886b5393/12364123599.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///33433712058.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/kikugejewivedixu.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_off0000eca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA6 10804 bytes
SHA-256: 5649e500c623c0cdc2faa2843064cb5e8d5cabf5db2c7f5d6a5df7460ac5e1c0
font_01_sfnt_off00010531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10531 18084 bytes
SHA-256: 0fdda0e91458ffed7d90e3f505a8ca6c443e20c3a595d0c4226066c10c8bf254
font_02_sfnt_off000133fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1