Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbfa723b06c7fd80…

MALICIOUS

PDF

69.5 KB Created: 2021-09-30 20:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 16e8b8b7f87cbc5c8faaf702ba914482 SHA-1: 04b16ac0ab48c03165bdf2043fb4e1312320380b SHA-256: dbfa723b06c7fd8054b114c6eec739be6c6d5dd80d6b05baaaedb2e809473169
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the presence of a link farm suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://pistant.ru/uplcv?utm_term=what+is+smart+switch+app+on+android+phone PDF link annotation
    • http://holzweiss.at/55440085666.pdfIn PDF document text
    • http://cascad-trans.ru/files/fiwesesakavewix.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/rhiiend1ft8vs8d79uo6ula0d4/22191995765.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/97673620552.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/bediwafejejaxotejagugi.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/82935577016.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/51647312972.pdfIn PDF document text
    • http://webantikvarium.eu/tmp/puxeridudibevitopum.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/tilurabojavaxagojomu.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144075a8a88f---vuzofijaxolajoruku.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/49328467840.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/79426677747.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/49268181883.pdfIn PDF document text
    • http://tmtteks.com/files/dewarabora.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16140ccdace80f---mufulekasuxi.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/69252115634.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/loruzuvewalamovabujeba.pdfIn PDF document text
    • https://hum639hb2-hh38.com/contents/files/60478079348.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/57307945985.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/57795926335.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/41055143305.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_off0000af4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF4D 10812 bytes
SHA-256: 56731f9250e30b89986d5a4915d744305d308ad9f973a6e2812272d74e8c85a1
font_01_sfnt_off0000c826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC826 15864 bytes
SHA-256: fcda003ee4d3881f0a4855a8f6b618b11d578eaec580ff472f05a86f49c4f99c
font_02_sfnt_off0000eff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1