Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea270dfdb6114d87…

MALICIOUS

PDF

80.0 KB Created: 2021-09-03 15:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b72524b4a246f8f3a9fcd009c3ada89d SHA-1: 04f91993e95c0814ecdaa468420ce8f622164077 SHA-256: ea270dfdb6114d872d7c019df385fd65fae8c281b87fcb445d9531d4f3580410
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://menlopark.com/wysiwygfiles/file/xikan.pdf In PDF document text
    • http://worldwidefilipinoalliance.com/uploadedFiles/files/momononowagup.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/27cad4aff416620de1bb547de68a058b/buvodesexinafilasumato.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/1e7f75f99d15a8d497da2935eb00a1af/25866317092.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/93603116359.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/xovuzidobigidupijad.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f81ea7792e---pesizozitupirozusokirav.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/7d39292ddce64912723fd2186f3ff4ad/rurumuj.pdfIn PDF document text
    • http://www.zaluziemalina.cz/userfiles/file/57315157417.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/vakuguzipiva.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118d37c0dcaa---doredabas.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3eec3ddac2---19655648601.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210501203711_147749030.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/bimexatore.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/xugiwewuropo.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/kozamawenob.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606c85b726253---90166105161.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/sf75j0rg5uqancav2ea9cr9s30/62394019570.pdfIn PDF document text
    • https://777mto.com/contents//files/veverexas.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/36eef7886ad5d9de66ae0238a680df3d/8222931362.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210626130544_1j4e4x.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/wuditaxotomudiramaxar.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/21588802556.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2a414322d---66041947552.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/i4o5cjumddjl92eui7ld0n6ur8/mifoxupasubefe.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/2279989425.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/vibedesagafu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=free+number+pattern+worksheets+kindergartenPDF 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_off0000d4cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CD 16916 bytes
SHA-256: 4f79a4a0c1061572757ac8ba16622fbf6696feb9cb87a494e125824184a05597
font_01_sfnt_off00010044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10044 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001185b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185B 11188 bytes
SHA-256: 5596de89da8c6d5c753e406ebd8624aa578148bceb578a7b8e90cdb48a51b852

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