Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb23aed16d614acf…

MALICIOUS

PDF

90.9 KB Created: 2021-08-14 11:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1b383acc2feedc1700e52c8c0d2c12ec SHA-1: 802ba5275c42a7eada0d1f8c4490c70c09f423d2 SHA-256: bb23aed16d614acf94699744c084b8f4f1881a9596012f889168f1a2b303c394
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing or malware distribution lure, as indicated by the numerous external links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the embedded URLs likely lead to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://irlanc.ru/uplcv?utm_term=how+many+dinosaurs+have+been+found+in+europe PDF link annotation
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/mvaqcn7pteko2o01bl2cbp6isd/21336728782.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607207c43e6f9---97623681275.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/76225187962.pdfIn PDF document text
    • http://huimao.com/upload/wijekelukozaga.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b30e787a923---gimifadomenefonatesekudix.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1d267bf29---mizevejigevukexonib.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b3ad8e35f---jumefe.pdfIn PDF document text
    • http://rinsacars.com/files/others/54735323801.pdfIn PDF document text
    • http://geoman.cz/data/file/najuli.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/37136548878.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160894f3846c67---92253830908.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/3391757548.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/0ptgldt9nh98lh22km1rpoeff0/leburafunivateguli.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/ribilasumimorizup.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/81105067556.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/f83ta2cu30hpk788pccf5glmtt/91737266884.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2507d30593---87743079890.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/3382276884.pdfIn PDF document text
    • http://jaika.in/images/documents/files/27548698870.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/f9148e79cfde649ea72abf0ea13549e1/raxaji.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/40120391446.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609d53f98584e---zakep.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5dd035f42---mibesigebodutogoxigakaxu.pdfIn PDF document text
    • http://skikk.nl/app/webroot/files/userfiles/files/jegizuk.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_off0000fd07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD07 17860 bytes
SHA-256: 51263e8636c5bed868c511ada8f12fa942e7f3b499bbdbba5a55a3b25991517f
font_01_sfnt_off00012a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001429e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1429E 11116 bytes
SHA-256: 6cd4be681e6371b9bef40c32c0dc28ebe1ba71fc2e89e92cc3d33ba437bdf095

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