Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a4ae65bd05d7e7d…

MALICIOUS

PDF

74.9 KB Created: 2021-09-12 04:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dba0bbdcbcba30b796fd6dc28e89e7a1 SHA-1: 4a9d5aedd767b8dc818ed2c7e8f11c97e9aea909 SHA-256: 8a4ae65bd05d7e7d7f618d4c2c4f01f8e188cd337f2776186e4fe82138b23a71
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm hosted on disposable domains, aiming to redirect users to potentially malicious content. The embedded URLs, such as http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16134154342aee---poxidet.pdf, are part of this scheme to distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://spzpoz-zdunskawola.pl/upload/file/79954942999.pdf In PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613bafb3da9f5---romokoxojigagab.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/38471238268.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138b8842a0cd---94972190085.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16134154342aee---poxidet.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/98255345008.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/zutevoxasizefagisinopebo.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/dogixapokawit.pdfIn PDF document text
    • http://apex-architect.ru/images/file/zutirura.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/c4896a0f359bf5f59db69861283ebdc3/95296259860.pdfIn PDF document text
    • http://klccpa.com/userfiles/file/vuzasilibatomevozire.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/dojijuzonomadonumosozivu.pdfIn PDF document text
    • https://salwangurugram.com/files/lajimunakasabigu.pdfIn PDF document text
    • https://simbhaolipower.com/images/file/jalopobemumemusoviz.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/worogikum.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/57206182996.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/dujipabupepigemo.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/peletini.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/25684553765.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/dopezotufilawa.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/kuzivivotufuselujur.pdfIn PDF document text
    • http://yusungchart.com/userData/board/file/44091087951.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=pokemon+download+john+gba+litePDF 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_off0000c19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC19D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B4 10876 bytes
SHA-256: 8b126b90c844314ea9508a3b2dc1ef25ff59bfad5c57ea14bb228493b2078686
font_02_sfnt_off0000f26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26D 16940 bytes
SHA-256: 00901af195b9b7b2f06cc70d953740695611e056398eb0c66cf922cd77c9a3db