Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d9bdea0f0dad65c…

MALICIOUS

PDF

79.6 KB Created: 2021-09-13 12:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ccd779c9b324c06cd362f46d5fb823c4 SHA-1: df7f19609d55a16a2d20c76540056b17c1451a76 SHA-256: 8d9bdea0f0dad65ce0df6a45f18916a0bbec07c12223e8097228afbcff092b14
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and other potentially malicious URLs. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4d6f83377---kimotuwadosuturaxigitaveb.pdf In PDF document text
    • http://birzebbugastpetersfc.com/files/file/sapezimuxiguzu.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136396a82941---78360248047.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/71800564299.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/biraresaxekegufotuxe.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/ziretebokovadagoba.pdfIn PDF document text
    • https://havilahbuilders.com/userfiles/file/tekaxogofabotufo.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136c5c59811f---zewolibesebizorekirebafum.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131001e1d9d5---pabegilizisak.pdfIn PDF document text
    • http://novichiha.ru/pic/file/66761799669.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/dedaz.pdfIn PDF document text
    • http://myphamso1.net/uploads/files/77264362171.pdfIn PDF document text
    • https://ksuskalology.com/images/file/mibibosasadisone.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/58835963180.pdfIn PDF document text
    • http://gpp300.fr/userfiles/file/22115618500.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16136e71f5b2cb---44375317928.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/9701855686.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/sofuwukefamodofusutimis.pdfIn PDF document text
    • https://cmf8.ir/data/file/zabone.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/74214307262.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/gunoliduvovefojidun.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/wosabexufo.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d0b07af81---60394057451.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/kefit.pdfIn PDF document text
    • https://kueapem.com/contents/files/tewupobovelijojaxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=unlock+android+autoPDF 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_off0000d58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58F 17084 bytes
SHA-256: fad5b12989b23d301b51ea400c76768e658087527d51f0e6c97031e01733d354
font_01_sfnt_off000101d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EA 10264 bytes
SHA-256: 88ad47ff3b18574df22a76809f04d902f33c309c9fec9fd828d1a1e508c42bdb

Open this report in the interactive analyzer, or submit your own file for analysis.