Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e301e2858665d90…

MALICIOUS

PDF

87.3 KB Created: 2021-09-07 22:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9d161c784626a1809a3ab25c5c4f8435 SHA-1: af66f6464cf2fb88c037957c1b282d422fc34e1f SHA-256: 1e301e2858665d90bcb3b36181d894466cca8d035337ade8f0e3ba42b6ef783b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and also by an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. Furthermore, it exhibits characteristics of a link farm, with multiple URLs pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites or download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • 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 http://sincaremedicaltour.com/js/upload/nifeki.pdf In PDF document text
    • http://lucann.com/Upload/file/jajefilatuliwatikezawij.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/mevidakefezemikojax.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c790549a2f9---67488314254.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16070868d0a6ad---kulisufebojolanesuxi.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/dasisagipejopimibeboribo.pdfIn PDF document text
    • http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/50927757840.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/38356984caab2690516fdfb21e53647c/xulobit.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/26535672671.pdfIn PDF document text
    • http://gr-chem.com/upload/files/1984827174.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/46883470684.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/8656698cf2e1010a9b5701683a2fa5a5/72189357005.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/vivuzaj.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/gepitivabagikizoxamusomid.pdfIn PDF document text
    • https://hostingyuvasi.com/calisma2/files/uploads/wavoniv.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/918da1b93a560f0f74b018805d0ed626/59971525297.pdfIn PDF document text
    • http://pyroglobal.sk/app/webroot/files/userfiles/files/kijugeje.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/70074146948.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/56165260287.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/61fb11be3d64bb0b51a64d9d1b67d10d/gapemunonifirimilonawadak.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/40334315883.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160730831dceb0---sukesosunezogow.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/4d250571eafe3a5cb56bcac71ec1ebea/ribupelowolajinovuduxadom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=benefits+of+yoga+essay+pdfPDF link annotation
    • 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_off0000efc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DE 10692 bytes
SHA-256: 653a672992da9267cc5afc310528d1a47a1e53094d70e356a340087f179d7340
font_02_sfnt_off00012068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12068 18152 bytes
SHA-256: d3d936eb37cf79de04110464494f12066eecb8464dc1aaa73b50c670ae774b60

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