Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ef1457750c084c8…

MALICIOUS

PDF

82.1 KB Created: 2021-09-04 21:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5d56ee2bfc79cb707178f17b89ed2ebe SHA-1: 49f03be3d9191b7a6735978efa7fca91e4d4d78d SHA-256: 8ef1457750c084c82ddec3d73111894e90c68ab29aaf2f6fa0396564f0100dae
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://irlanc.ru/uplcv?utm_term=solving+quadratics+by+factorising+worksheet+tes PDF link annotation
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/82840313924.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/57860321408.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/13558790967.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/7521336576.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/tezejinimut.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16124d7cd3a540---nuxejalelijafuxemom.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/ketewu.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/womojuwumefor.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/22177570964.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/0gmjfhpgjt8l7qidb7ttdpmisl/24984052932.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/1a75fba77e762249a490a6e038fb3798/regenemejozawajodizibo.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b299817acde---73271127530.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/0edgji8cpmlg1k7lmit1hg53je/lurogutozibuxojenomexede.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/nawadapokalotodenobuw.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/88603465576.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cd8491245---76879959634.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/47392334251.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/59038412687.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/bozefugotofobixopob.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8eae971832---12265107141.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/lodevakata.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4732545819---tabag.pdfIn PDF document text
    • 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_off0000d7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F2 18392 bytes
SHA-256: 16472b3df05898cda9233b516b7ef3b3b5dc0c13e9f0af12bf4033b72f9db869
font_01_sfnt_off00010748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10748 11576 bytes
SHA-256: 80af85df1cd09174a9cdc90c9d39dda829eaaad193b3585f60e5137222d7c7d4
font_02_sfnt_off00012249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12249 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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