Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b06562d9ad18a2…

MALICIOUS

PDF

80.1 KB Created: 2021-09-19 06:28:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 045b479fe7742b63901c6f405e1226ae SHA-1: d7fccfd4e2695b62add66d97b083bace9c661aa6 SHA-256: b7b06562d9ad18a29d3b38253ee701085a86456becd1df1a2a9022250a573b59
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. The presence of a link farm suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://tbff-bygg.se/img/files/geginumarevamusiza.pdf In PDF document text
    • http://erbamedica.org/userfiles/files/7597688023.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/161403b07cfb1a---vapavebotakinokexug.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/sajujegijowom.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136b02729877---rigidibogitagusepuzatetis.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/24661361210.pdfIn PDF document text
    • http://4rrecycle.com/files/file/ledubosepafepasadisamaton.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/29178077653.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/mimega.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/99253236317.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/72695627795.pdfIn PDF document text
    • http://mlight.cz/archiv/file/somutulijepasuzutat.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/zadazizegiwilito.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/zejobaji.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/5114059460.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144aa16230c7---jaleloxelu.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/83179160014.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/33698548886.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa712c6f90---sowejivirovutosogabo.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/3649831203.pdfIn PDF document text
    • http://www.vnv.nu/admin/library/ckfinder/userfiles/files/23370849114.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/91339346552.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/wamodazivopidisamubopeke.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/57236670439.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=open+dex+file+androidPDF 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_off0000d496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD496 10352 bytes
SHA-256: 16994a03f7ca67d5a65a6af220731edfdeb6ebfc533d54528091a4c0b30c32a1
font_01_sfnt_off0000ec0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0C 17720 bytes
SHA-256: 7ad90ebcc7292952f12308f567a698c89074286f90241a598055b547a7d52c85
font_02_sfnt_off00011a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1