Malicious PDF — malware analysis report

Static analysis result for SHA-256 845c471efb950dd4…

MALICIOUS

PDF

85.2 KB Created: 2021-09-17 18:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 422bb044e01513c001f50d35d0f2b613 SHA-1: 19bdd874e007d70324503282246add64032180f8 SHA-256: 845c471efb950dd43a3ed000c699ba0305d85f94b1d2b12d2a46f4d3849a0aa3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable hosting or compromised CMS upload directories, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lexuspolymers.com/assets/ckfinder/userfiles/files/16258859565.pdf In PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db9acacb46---vutusasotofirovixul.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/lubawitibatu.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/94390150343.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/92791246486.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/jotena.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/64220377317.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/poperiwudotebapuweravede.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021091002171589.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/vibugemulukonimad.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/55669149156.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143927faf812---81331635404.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/gizolenedugogowodowozuzo.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/14179242249.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/menopoxelowus.pdfIn PDF document text
    • http://unityproductions.com/upload/files/tiwutido.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/e50fd3b1a5bf82f0026b26063fb54ac9/9141804548.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/46927287981.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/jujimud.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384358b1bde---19232484841.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/32996059916.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/tadegu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+reset+in+android+phonePDF link annotation
    • https://tes-sys.com/uploads/ckfinder/files/20210906/16309394553776.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_off0000e92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92C 17620 bytes
SHA-256: b2d6cce58122fcd6566c4bd90945d8a5b006a17eb72530c8730dda64f4d131e0
font_01_sfnt_off00011746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11746 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F5D 10520 bytes
SHA-256: 401afc444850c29ae6da4151fd507c5321df342a80249c1a3fb6b757c10ff881

Open this report in the interactive analyzer, or submit your own file for analysis.