Malicious PDF — malware analysis report

Static analysis result for SHA-256 4384f905f7bd1cc4…

MALICIOUS

PDF

84.2 KB Created: 2021-09-17 05:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b717883e44dba98c9875886542748e58 SHA-1: 590f6178f09d678f88bb4b7702ed1353ac47f505 SHA-256: 4384f905f7bd1cc4163badea3713f925753220c3670d8da12f7cf4b853d8295e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

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://smidgel.ru/uplcv?utm_term=oreo+tv+update+version PDF link annotation
    • https://aronabritcan.com/userfiles/file/xolubemogisinirow.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef4da3fb5a---gazizafapofuxabobiz.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/tonozopexamazetamalum.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210909114456.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/86158258258.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///ragezuv.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/zututizen.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/57848154715.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/15068260759.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613876893337c---tenikim.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/34485759503.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/42264871837.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/sovole.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/32834720742.pdfIn PDF document text
    • http://mweb.cz/images/file/vemogu.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210912_230009.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/54363751358.pdfIn PDF document text
    • https://chambres-lannion.fr/userfiles/file/wivivakogaxura.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/90442317592.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ab5aa42ad---nejilago.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///94359793457.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16137ee47cbaae---julimovivupepevuna.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/ponavodiwedujekebunivetat.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_off0000e45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45E 18116 bytes
SHA-256: e8b22957a8f37e0c5468ee558f4a8dd4fa0c90a89b9cd3de8d148359d7aa4b0d
font_01_sfnt_off000112f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F8 10528 bytes
SHA-256: e3caac8faffa475e98cd71e0a68e55398e7ba26b57a345ba7828a999f6c05a86
font_02_sfnt_off00012b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1