Malicious PDF — malware analysis report

Static analysis result for SHA-256 b44e91362c7cfae1…

MALICIOUS

PDF

90.0 KB Created: 2021-08-20 03:16:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3ceb7d87202136e540b6fceaf735d890 SHA-1: 5fd61ffc0d0a3efd5dc7e8be208563c1acce9739 SHA-256: b44e91362c7cfae108894f902188a630b52c5c620be382669d23f463cde786c5
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute malicious content. The presence of urgency and download button lures further supports a phishing or malware delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chcial.ru/uplcv?utm_term=biochemistry+5th+edition+%28updated+and+revised+edition%29+u+satyanarayana PDF link annotation
    • https://namkhoasaigon.vn/web/images/files/biletub.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/9lj4eqisse3bv0v6fds9kme01t/88982946847.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/rewezelogikabiravivijo.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/65395362646.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/a4be5eff38065fb7379740fcc38be93b/voguzowavozuri.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160960b7689f05---wimurozojixikat.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7f5f3baa42---42359540832.pdfIn PDF document text
    • http://skincarebylaura.com/clients/862251/File/70085390452.pdfIn PDF document text
    • http://diclenakliyat.com/userfiles/file/murotilamabik.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/82098985349.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3933b27be5---44582925729.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/kivixusosefisegejabemawim.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609101f68e744---vozasaxedexonezesisog.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/dizawoke.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16099a9e0de64e---99589463723.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/dojalumopipedawa.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/63618558644.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/82792046110.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/969d3589deb97720aad7f8f28a7d8e7a/jodewivokefomoxegaka.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0cbebb71d---9389958115.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/1cff2ac513bd23e38cd0ae9937bd8c2e/64857389801.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/1bdebf32db41da93cf64fd1259333509/gexenogovewe.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/23674598263.pdfIn PDF document text
    • https://wagaskar.com/media/84045101517.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609127252b390---pixopatagubigovirit.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/64274739073.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_off0000fbcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCC 11356 bytes
SHA-256: eb67ad5b4bfe979b64fc9e0c88f1e7db6185490866ca260afefb340739b75fcf
font_01_sfnt_off0001169a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169A 16160 bytes
SHA-256: def64043221aa2a4dcc6e94d701327ab7c71e3b0b68eca683697ae6a76428ba0
font_02_sfnt_off00014055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14055 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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