Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ea8361d65abdda8…

MALICIOUS

PDF

63.8 KB Created: 2021-06-19 16:07:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ee3b4115f17a3f8ef2b05ba7af7642f6 SHA-1: 2ff6b1a2117d0ab38ddce54fe0e597432b7fbbfa SHA-256: 8ea8361d65abdda8dc29eafa1129bc6cf52d465e7e35ca9fcbff470fc4e5a603
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites hosted on disposable domains. The embedded URLs suggest an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9745

Heuristics 5

  • 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
  • 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://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759bd79cc30---gigegugajenux.pdf In PDF document text
    • http://wisdomtours.net/upload/file/tepanevesalonogevetasi.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/ccb0516179978c5fe7e6968ba55af29c/vapudabexajejoreg.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/e3c127e45aafcce044e4423ebc65b1dc/54169732140.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/jibika.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/jaxevexulodawafurejinetil.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/256kq66k132eicfm9qg3ck9f7o/25376747287.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/ofb6voc16rmt8adcmj7p9lhsi2/59073251763.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/bd438cbdc2c2e0d8b9d2b4db55b16050/ranofuzi.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160918d0174cbe---pikidolezu.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/a656b6b5b98b0731079865247b6afabe/buputujuwadepan.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/78272673661.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/kejoredomuvifu.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/mutupisoxogiworuxuzivid.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/teliwatilejavej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=lm35+is+type+of+sensorPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEB 5136 bytes
SHA-256: 35daa0f91420ef84266e4e57a271162c2013ecb31ba60824bc667923a8e8dbe2

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