Malicious PDF — malware analysis report

Static analysis result for SHA-256 889536aa4b6c49b1…

MALICIOUS

PDF

71.6 KB Created: 2021-10-02 14:16:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c756d7cfe08da3a424d9f9902c196563 SHA-1: 6e24af63dd8c96eaf4e1b07e467c480fac41572e SHA-256: 889536aa4b6c49b1b7ae30a35b21b177e0db5e04df331036fa4ca5c37784ed22
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://deesudcoolingtower.com/userfiles/file/dozipedepulusobukukusul.pdf In PDF document text
    • http://holzweiss.at/45376895713.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/32544415422.pdfIn PDF document text
    • http://atsolution.org/userfiles/file/20210911214232108816527.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/miwemufujifuboma.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/45548152673.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/161373fad86fa0---gikofuvewalaf.pdfIn PDF document text
    • https://adikmanis.com/contents/files/51272278017.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/67541413505.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/risuzodekup.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/33388323172.pdfIn PDF document text
    • http://cuacuonbinhduong.com/upload/files/48788761270.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/xonekuv.pdfIn PDF document text
    • http://minhnguyenvn.com/uploads/userfiles/file/60461880037.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/57564871736.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/liguz.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613a68b8b8558---dafafepivanixijulobo.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/guxowiluzebotebobupol.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/42895859007.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/libetiz.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614de0a2572ee---runogin.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/41382571160.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/68262591224.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/69398254688.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/7b57phfjb6umujjloaaatp7n2c/gedejowabewuxuxogiwi.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/44669963745.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/71080269924.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=laugier+essay+on+architecture+summaryPDF 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_off0000b650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB650 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE62 16360 bytes
SHA-256: 345912cc90f17e0dba2b13c270a311d23b1e6f952e367f9c32900440a2fce337
font_02_sfnt_off0000f7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CE 10800 bytes
SHA-256: 53bdee380c18e595bb9e35ee97479e92d4d27f78d5b54dadc9c2e609bc15d47e

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