Malicious PDF — malware analysis report

Static analysis result for SHA-256 2385078346502af8…

MALICIOUS

PDF

81.6 KB Created: 2021-09-21 17:36:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6ac48556ea3e22b7a3eef7defdb167b7 SHA-1: 54dd8973f2079537471af0b5ff3e0397d2bf84e7 SHA-256: 2385078346502af89ae36e3b2cd80ff2d53500934c8620de77f6232ef594cfaa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, forming a link farm. The primary purpose appears to be redirecting users through these links, potentially leading to phishing pages or malware downloads. No scripts were extracted, but the structure suggests a lure document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cructi.ru/uplcv?utm_term=no+escape+full+movie+free+download+mp4 PDF link annotation
    • http://datong-travel.tw/upload/ckeditor/files/20210908014533.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/ocdqla0d0kde93sluiuu48oj72/kipomijewofabotaweketaf.pdfIn PDF document text
    • http://zeci.nl/im/image/vidotolidewonefosoke.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021091695233_319846415.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161393a3aa65f7---vikukabegulakawevil.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1613f222c144b6---kilafuborulijido.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/luvurobiparedezarozimon.pdfIn PDF document text
    • https://florissantdesign.nl/docs/Image/file/sufagakejetixu.pdfIn PDF document text
    • http://bhandarisurgical.com/ckfinder/userfiles/files/woserid.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/65026761796.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/kigujobe.pdfIn PDF document text
    • http://steinbach.casawell.tw/userfiles/file/51736864158.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/98410511123.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/09992999cde37fa621d99eb80ce8e8c2/10929972190.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/numapojigowedotafimavopig.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210915_CBB6715A136E58B8.pdfIn PDF document text
    • https://km2804.com/ckupload/files/fivoxadi.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/90681866241.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/zavurarafigugajigefa.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/66553523761.pdfIn PDF document text
    • http://elma1.ru/!upload/files/19230986121.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/xufilutogemegedugemibesi.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/vepijabojobenupalud.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_off0000d90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90E 17656 bytes
SHA-256: af657f0303d51a0198e7f3ef3595775bf3bc58700f7c423c5db9547b6bf06b5c
font_01_sfnt_off000106d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011eee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEE 10992 bytes
SHA-256: 705cae0e44e4baa98a473d343c37eba17ba8a8b226eac5db77582c34cdcf26a7