Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e9050727a0044e2…

MALICIOUS

PDF

76.2 KB Created: 2021-08-09 03:33:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c6a2b0cd3c4ab660fcf29b7d9e99f836 SHA-1: ea06d5f01ccdc757eeb2447b6f4920b25edcffb3 SHA-256: 4e9050727a0044e21cc450b77ac6e5ab7bcfb7b34e7b72a5fce09eb149c442c9
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and contains no readable content, indicating its primary purpose is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://tubietelbar.hu/uploadfile/9251120657.pdf In PDF document text
    • http://utopiasacramento.org/clients/0/07/071cdeedc048305be324eb10ab8031d4/File/rosorimoluzuxumav.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/50474548555.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/42e1cb6cbe04d9ee1fca0cd4db5090d9/nirirujiga.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160beba015c909---72707490309.pdfIn PDF document text
    • http://adbrf.com/files/fckeditor/file/801958976100616d93841.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/vuwataxitunanojapobefik.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092315dac40f---42082708547.pdfIn PDF document text
    • https://lukili.ch/UserFiles/files/45443833469.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/32679331183.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b84d1f4c92e---risibelepaxabofusepuxe.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/gi312mvfq5opbecmmug7gd4gbr/wezarafutavimi.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/4fc8d1d3b265ac3fe25d8f78af216edc/49945161373.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/9228200677.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tamozipakijuv.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/52511047007.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/42030181557.pdfIn PDF document text
    • http://joewhitefamilysite.com/clients/59967/File/gederapuwazazaloma.pdfIn PDF document text
    • http://stevis.cz/files/file/47467678087.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/wabikijugikubajojis.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae93072c317---55482754434.pdfIn PDF document text
    • https://htchninc.com/d/files/82707199509.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1609432022276f---tefitafujurirerimabuba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=ceh+certified+ethical+hacker+practice+exams+fourth+editionPDF 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_off0000c2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000daff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFF 11208 bytes
SHA-256: 104f129dc2e722fcd3fbd762537c69219b70ceee7bce5c6995be2bd4b21f2697
font_02_sfnt_off0000f510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF510 17548 bytes
SHA-256: e7fac11e459769b9b2514fb628df55e1a5bb4089092ea58d958f5feeb05a15c9

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