Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd1a1fc94408312f…

MALICIOUS

PDF

74.6 KB Created: 2021-09-14 07:36:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4c3253d61692af3152ee25bb72e3f676 SHA-1: e6b874501a4541b0b8ee08be46a0e223b0faab43 SHA-256: fd1a1fc94408312f953aa9205c06870e2a274e0a8f8af0264881ac3f8214c21f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=fastest+ps2+emulator PDF link annotation
    • http://cuboni.com/uploadfile/hong202109091156079541.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f2decdcde---84555672005.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134b05970d19---65623591301.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/xusosu.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/bukifesunoxudutut.pdfIn PDF document text
    • http://thewesternmist.com/userfiles/file/76175379668.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/puwofagatukuj.pdfIn PDF document text
    • http://premiercontainerlines.com/media/ftp/file/bebuwuresegigewudatebike.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/81184223275.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7e8aecc15---45031284172.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/fabodunekukasulepivolu.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/24640283394.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/35982889737.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/penonazatub.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/xizarisowesevetosupopol.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/22492734260.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c30b0f1fe---palebepugewokasotebep.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/fipevitemexibisuketotuneb.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/nasisutomemupabibosobu.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/53629592032.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/ledezupalafona.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/fugovodigikibavumu.pdfIn PDF document text
    • http://vititanon.com/user_img/files/dojevofimifarubetimu.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/80353820057.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_off0000bdd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD1 10416 bytes
SHA-256: 52ceafee6096a18c176e1a54137743b066894bb62a86f214c5180a1b3e7c9ba3
font_01_sfnt_off0000d583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD583 18244 bytes
SHA-256: 7316ce7ff79a299fcc27407ce42f0cfd23d444a3e1eba046579191010207f40c
font_02_sfnt_off0001054a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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