Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d77f9304fe3536…

MALICIOUS

PDF

87.0 KB Created: 2021-08-11 01:36:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eda98996215c12cf98cf1095762bee04 SHA-1: 5ac999836f6fb8606c500522c73832d3322c5d0c SHA-256: c5d77f9304fe35363241ee5e9043e9c1cfdf583b279191dbfff0d10a9ad3cf40
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of multiple external links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://medvor.ru/uplcv?utm_term=fnaf+world+download
    • https://nistd.in/userfiles/file/2139978377.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087294ddde89---zosof.pdf
    • https://pbchistoryonline.org/uploads/file/42773727352.pdf
    • http://gdgom.com/upload/file/210803141600154700xc8tdbu3uco3.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba38bfbcbf0---zewivewesikamuzeg.pdf
    • https://lawina-radom.pl/files/file/legumesoluduligarakuk.pdf
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/u15heplqosb575u4u02apti7er/nafinexami.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096bf907359d---wuvuvovimabexofixejemeni.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/b2af47cb38e58cdd8ef23a4495d57c4a/xodajolajarurasiraxakod.pdf
    • https://yssnewlessons.org/UserFilesTwo/file/kifonubowugokobuxinuz.pdf
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/difisadosemegadewu.pdf
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/7e75fc19e91a80f1ecc87909ca3410cf/68404230880.pdf
    • http://pc580.cn/upload_fck/file/2021-8-8/20210808120359991596.pdf
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/soxinisomutamedoj.pdf
    • http://ff-engineering.com/userfiles/files/wuwapiwutibekevuluk.pdf
    • https://roweryelectra.eu/app/webroot/uploads/file/16201952984668.pdf
    • http://busankid.com/webfiles/board/file///57812539625.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c6faf358438---zabunamugudedenugo.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/ab1974os3g68o17op4m88rmqgu/60803628964.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/a0f215e25dc6ec1c8c9c1b1c5882a9bb/puduruvitutimozexu.pdf
    • https://wittnebel.dk/file/xezipexowifitabale.pdf
    • https://vydavatelstvoklett.sk/userfiles/file/kazubekenus.pdf
    • https://avflash.nl/upload/files/fadonefilovi.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/593a7950da7af1a5b9fa6591f85dcff0/korotaze.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f362.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF362 16792 bytes
font_01_sfnt_off00010b78.bin
8ead11316843b43865e3452c7c027e1f80f261580cc23e6cfdb3c595868274e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B78 9920 bytes
font_02_sfnt_off00012175.bin
85749881217af5118f42728ed872d2ad34aaaea999f1327901dfb2cb9b90d110
pdf-font-stream PDF embedded font (sfnt) at offset 0x12175 17080 bytes