Malicious PDF — malware analysis report

Static analysis result for SHA-256 333fe7bbc192a3ed…

MALICIOUS

PDF

72.8 KB Created: 2021-09-10 01:14:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 90ea86974834ebd14031320f7c326fe7 SHA-1: 8ba55839ce62e28911503f8333c310f07f86ceae SHA-256: 333fe7bbc192a3edd9719c3ede67211b4764a96c4e341fa9b9d1544104a14478
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm, directing users to numerous external websites. Several of these URLs point to compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://domusanna.it/userfiles/files/jinezemikuta.pdf In PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/161327d172529d---78067740989.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a771053b28---97489882158.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/94301468029.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/vedimapibulebetagugibig.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/25875903861.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/60466472628.pdfIn PDF document text
    • https://harmony.im/userfiles/file/54034858055.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/20oqkjlpnpk664vv61q5qf5s87/zerobofisaxolumisevezadi.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/muwig.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/58641376924.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/mazebu.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/d1d4dc730995d0a4926c4135194eccf2/rijidakatibakigiperuveba.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/45b4bf15e989f24501a246f6996d7dea/71486431207.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/setozuvoxewagodimamedirex.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/67262385401.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/xedigiragubodeloko.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/vobizememate.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/25813236911.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137df28b7fe2---gebulas.pdfIn PDF document text
    • http://bwc.lt/i/19201616871.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/18313320245.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/supamomipujiro.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/04f27ffacea9713a05fc51cd16f61cf5/9394076935.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=madea+neighbors+from+hell+full+movie+123PDF 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_off0000b9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9C6 15956 bytes
SHA-256: 6ce5634fc2e096d55cdae997b18893cf7139cc82912d9237a3bde345213dcf6c
font_01_sfnt_off0000e2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C1 11348 bytes
SHA-256: 48ff8ddfd9a540265f4bb517f4186ab96c37d3925a17b25e1f55309f53069845
font_02_sfnt_off0000fd1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1