Malicious PDF — malware analysis report

Static analysis result for SHA-256 c09c2a2cbf898d40…

MALICIOUS

PDF

70.1 KB Created: 2021-10-03 21:14:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b16309a7d9367f667be89c46af8407b7 SHA-1: 29151e390d3824d98af63a32b842ea52c4bd9d7e SHA-256: c09c2a2cbf898d40e81b0583e7ada87b08ff2720318bbf8bfa8489af9ded1d6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous disposable domains and compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://kant21.com/userData/board/file/wotuforibawi.pdf In PDF document text
    • http://caratow.eu/userfiles/file/fuvagapuxi.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/xoxazibegarida.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/lutilokivofiledas.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/lomigadesopasu.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210920052941.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/fipusesalapifudapotovi.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/68613207674.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130e45679dbc---98670010517.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/mijala.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/sotadiv.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613244b520a8e---92778037665.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/visivuret.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/75914782519.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/25022740612.pdfIn PDF document text
    • https://ancoraeducacion.com/images/23778865431.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/gufapanefokizidisuzises.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/jufivatabirinipaxebi.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612e98fbbee25---81504654716.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/26826137157.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/2146348957.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/sugigat.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/24676715126.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+level+up+mastery+in+warframePDF 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_off0000b237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB237 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4E 10876 bytes
SHA-256: 2a8fc19da6b5b0c51ac87ef3e94c31ae11fc4d990b2ae84b9cb0c8af202282cc
font_02_sfnt_off0000e377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE377 15472 bytes
SHA-256: 9b8e258cc1b2261f02418cd8bdedfe02bc14df53ce5ca49650dfa83bb6b77f33