Malicious PDF — malware analysis report

Static analysis result for SHA-256 154ea8e5f7e6af0d…

MALICIOUS

PDF

89.1 KB Created: 2021-09-04 01:01:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8b6fa9a146f9719936622a4639dde14a SHA-1: e37734e7cf69a4c5ced66d910b7aa74865654550 SHA-256: 154ea8e5f7e6af0df78b67ac8a1aa880c822c952180e2960ab267ab7b045fd71
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, aligning with phishing and potentially malware delivery tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://toshiteriyakiburien.com/uploads/files/genikodimutugijowusonile.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc0bd4e2b2e---wuzutaxam.pdf
    • http://narnivet.com/userfiles/files/refanibixejufavetomosa.pdf
    • http://moveworldtogether.com/datas/files/64289843327.pdf
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/17341562244.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/a3b69db7b70c5c6d3f9b773dae7881c1/xuferuna.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e2d91038f---29529727912.pdf
    • http://ozari-ua.com/files/file/jimokuwododunosoni.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160787d4caab8a---noduwofaxevalimox.pdf
    • http://langeline.com/ckeditor/upload/files/20558606338.pdf
    • http://954move.com/clients/4890/File/vilemirenulavejufomakek.pdf
    • https://lescourailleurs.com/upload/editor/file/3084753393.pdf
    • https://psihodesk.ro/ckfinder/userfiles/files/58141168509.pdf
    • https://hsse.cl/files/1395798292.pdf
    • http://verynailscm.com/user_img/file/70096424862.pdf
    • http://medianet2000.net/amm_prod/image_news_popup/file/jepajaj.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/a268b6e2789c20489be9545709d7566a/4169475730.pdf
    • http://tscyw.net/userfiles/file/20210713045813_ra9ams.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2619372f77---15083888105.pdf
    • http://crocepadrekolbe.it/userfiles/files/rujodogipopetuzu.pdf
    • https://anfauglir.com/images/file/84618891227.pdf
    • https://aljazeerahdrilling.com/userfiles/files/tetogojekitiruvitafobijek.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7cdca66ba---5227854502.pdf
    • https://music-group-store.com/upload/files/65679922087.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/bd4e69433f1ad331439ce14062e6db43/1147606641.pdf
    • http://didocrosby.com/imagenes/file/25334497874.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=leyes+de+los+gases+ideales+ejercicios+pdf
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/86ff4b0f82f56bf693d03380356bc38a/vevotorukites.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_off0000e777.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE777 16792 bytes
font_01_sfnt_off0000ff89.bin
46844d67226224e20a8fc2f6eeda8230098e32179a04dbca0b0c52382bb9b1f2
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF89 23868 bytes
font_02_sfnt_off00013def.bin
d20c157c2e19fc718c3a9b84e4287b68715e15ce0454784330baaf9251043a79
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DEF 10792 bytes