Malicious PDF — malware analysis report

Static analysis result for SHA-256 47fe11ce4fc7e736…

MALICIOUS

PDF

72.3 KB Created: 2021-09-26 17:12:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 61242bff33ea247c7730caeb2b7694c9 SHA-1: eff9943837dec64d2fb1d55a9acf10acd1389070 SHA-256: 47fe11ce4fc7e73605ecb9fb6b5984dd4f67627e775a9ec932e7ae4f9cbc42e9
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, embedding numerous URLs, some of which point to compromised WordPress upload directories. The document body is heavily obfuscated, but the presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://hondamienbac.vn/userfiles/file/68276488552.pdf In PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/161307ecb8cdc3---2697401907.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/51164676192.pdfIn PDF document text
    • https://unaizahic.com/Files/files/zitojodakaloxo.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/93081123894.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/nigedexumixeg.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/wawogebolafodafuvabojak.pdfIn PDF document text
    • http://onlinevay.com/upload/files/losujajorunusovobabobu.pdfIn PDF document text
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/zupakexolifininiki.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/8987574da972b796320bbde7b4098054/sosabifazisepajifetemez.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/0191397869c836970691d3dc0e1309f1/pixemixumomijem.pdfIn PDF document text
    • http://leguido.net/files/35225124433.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/73508204228.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/33230928866.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/65181715404.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146d36c668bd---tajipezatalobewo.pdfIn PDF document text
    • https://sanagustin.cl/files/23652138831.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/wolus.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/28849112448.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/76647835798.pdfIn PDF document text
    • https://5974293.pasarantogel.com/contents/files/xifojise.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f7df12d747---51430441910.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134720837c61---53640875652.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/rezovamu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=pokemon+go+spoof+android+no+rootPDF 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_off0000b5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D4 10888 bytes
SHA-256: 9f95f74c7df5b807e6b940284e8d4ff03e7fd46d3bb569b458796b0c5bd7a889
font_01_sfnt_off0000ced5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED5 17324 bytes
SHA-256: 8a4b4bd94a98ebcc45a2f01d23169609f46013ecf266c3c2ae4885a5f79790b0
font_02_sfnt_off0000fb6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1