Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0ec706e75f64d21…

MALICIOUS

PDF

87.3 KB Created: 2021-09-12 12:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ed08924cf284cc0805eba2e0d85a33a9 SHA-1: 0d37a23bc485d54f4e1c7334013b8ff873f12573 SHA-256: d0ec706e75f64d21d3bb91ada933dee4d31dd4f9b4624311c03adfda2107df39
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://massimosusto.eu/userfiles/files/38703699248.pdf In PDF document text
    • http://studiocinti.eu/userfiles/files/12812592700.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb35b48fdb---59014532616.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6ea2eafc4---44230706959.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60749851474.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/7254055039.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/62878229632.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/56831799411.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/ligubewufo.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/mixexovatipixujiwo.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/haujhlglma7s70ps076gerqjlr/50728637740.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/sunixozisafi.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/zuganoti.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/filodetolok.pdfIn PDF document text
    • http://asvpp.fr/pdf/52329253881.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/uacs5a336dpgop8ftalb1qgn6f/tuzitawemekujuvef.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/51987047218.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcd40c0404---25746365005.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/rufutitigugud.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/wisesifizibemugudodade.pdfIn PDF document text
    • https://soechi.net/userfiles/file/bizapepedekafek.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/64p0c63dsmks5jk12rasv00p35/55891803559.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=the+android+and+the+humanPDF 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_off0000ef24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10736 18896 bytes
SHA-256: 3df1864d77d812bb4b5ed2b458a64f9cc9cee151f0c0ba10ad0f2d236b472f52
font_02_sfnt_off000138b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B2 10364 bytes
SHA-256: e96cf3ce6e71a7fad0d44e49fc88e2e49265307fb598677419ff0d450896dc37