Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c8dd3a957d5768a…

MALICIOUS

PDF

77.8 KB Created: 2021-07-30 16:12:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2fc1af6789bdd86098e90922538041cd SHA-1: 5ace0f607cd5890aa0da71493d4a320de80737df SHA-256: 5c8dd3a957d5768a0363f08251a2b466200f33fa6a6045880554aad850b40663
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised websites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160947cb3cd223---jozupuxoladaro.pdf In PDF document text
    • https://bangvetthuong.com/luutru/files/bilulipo.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/jelafa.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/32851513708.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be3be8b78e8---11011792571.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/38911485012.pdfIn PDF document text
    • https://himanshikitchen.info/viking1/uploads/files/82657707666.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/susejawuredaviw.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/93365835694.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/p333chdmm845n0fgmrq457cmn8/buxabus.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/40158909406.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098589ac4e46---62021703956.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/tepigulo.pdfIn PDF document text
    • https://vpmemorial.net/images/file/49027681039.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/8ec4b337824e713a1886bf739722378d/genebofilezisiroluguzibet.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160d9d21060606---regirifov.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/damusisuvegogo.pdfIn PDF document text
    • https://sambelteri.com/contents//files/tajalowubejofozibarete.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/5222423972.pdfIn PDF document text
    • https://cargobull.cz/res/file/61735879329.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9b88a8e2b---darufabanarilafawedeloli.pdfIn PDF document text
    • http://lordbeaverbrook1973.com/clients/76835/File/50829753598.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/52280923351.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/bbf5a6493c03a5cc8fc6995e9011b9ad/41169252368.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/55043164855.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210715200226_oda74f.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=tambola+tickets+book+pdf+free+downloadPDF 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_off0000ca92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA92 11064 bytes
SHA-256: de6f1372203e088a88c07d2b5166a1d3d1454c5442c92683dcba12cf2f43880c
font_01_sfnt_off0000e42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42D 17412 bytes
SHA-256: 61506b1f9817180e23efb364f0c52244ceeb7530a616da6c1392f59b6e5155e0
font_02_sfnt_off00011161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11161 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.