Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8b2ef2005a8dec8…

MALICIOUS

PDF

76.4 KB Created: 2021-07-04 20:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 57271eba8cccbbc8e54be0c67da9706e SHA-1: 3bf56e35a3b26c52b2b20906a0e24c6feb06787c SHA-256: e8b2ef2005a8dec8b5428c910daa7f02b95fb4c9f44bdb63e8c9744cab912bb5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. While no scripts were directly extracted, the structure and URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/h5t4mumc9qtrr6ijs9behjtmko/loxitu.pdf In PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750f2003a47---55776622388.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/b63b0f2d818b8aef17802e0109d91b23/dovifa.pdfIn PDF document text
    • http://griswoldremgmt.com/uploads/files/57074420227.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/78264226494.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7ed7cdfc0---jaxodotol.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082083e55d9e---baguwugipamivivevixado.pdfIn PDF document text
    • https://papiratisk.cz/soubory/xufesegebaronugabelu.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/480949897.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/norizovafuwegatilubi.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084ae4b93492---gosozege.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/joql5a27ilvp9p8mq5vlmlhp4h/zuvagideditufugizegi.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16090c913a6e22---lituderokewinovi.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/483ae13ef351e360e8fea23ae50600cc/buwaxegiwowotege.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/71112897375.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/87942626197.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/mugonagezi.pdfIn PDF document text
    • http://mashtalkandil.com/userfiles/file/taxiwewezojeguzub.pdfIn PDF document text
    • http://nakatka.com/files/file/livilidupafafo.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/fibuzavipodo.pdfIn PDF document text
    • https://go2germany.ru/files/file/sigibiwofa.pdfIn PDF document text
    • http://jfe.hk/userfiles/94058876390.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160763bc436389---tulunivebig.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b04b3901bc9---tabitoru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=after+tax+operating+income+formulaPDF 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_off0000c8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FF 16552 bytes
SHA-256: 34b0ec4957a8a0ee20cc9fda6fc9a56fb5b4de14537f818575e8a92fc4c77aa7
font_01_sfnt_off0000f3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D6 10840 bytes
SHA-256: 620f63da52b8dd523bb660a6d7baf519413daedaf1c0d16e92b40f8f07f29089
font_02_sfnt_off00010cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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