Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb858a18a4532345…

MALICIOUS

PDF

126.3 KB Created: 2021-07-05 08:31:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 03d7bb0995d922965bc24d271506f511 SHA-1: abd611076d87643a9da16073b7564780d23956fa SHA-256: fb858a18a453234557ebd31d2aae748b022c9d8f825f60bb8ca91270fdbb1558
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links, many pointing to compromised WordPress sites hosting further PDF files. Heuristics indicate this is a link farm designed to host malicious PDFs, likely part of an advance-fee scam or phishing lure. The embedded JavaScript is likely used to facilitate the download or execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160893b0f8deab---16932043321.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/b8n451c9tkja2edki8id6gv2ks/nipepumifibitubi.pdf
    • https://areicon.com/images/file/gusinamobudibe.pdf
    • https://ahreco.com/uploads/news_file/wodasufobon.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a040b8e79a6---22078079964.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925d615a9ee---69060307964.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/hkm0n06mcglg5rn78jvgqhh545/67155805252.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/238f6602e1be9052f8f43df0e8ea40e5/xutosapepiveraful.pdf
    • http://dalnoboy.net/data/filestorage/upload/files/novuj.pdf
    • http://dientrotiendathc.com/media/ftp/file/7250853742.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a204790b852---26636124146.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786948d75c2---17928806017.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16076d0227971a---katiximovutu.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/4cdefff5795ac4902c20551171656121/39855927395.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b934ed5a3d0---ditilisupixoronarijatig.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/3hskg3f2kjo8pt5vataimfhec0/pivijajemawamugupiwu.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca082675f8---5209306915.pdf
    • https://apoiotelecom.com/imagens/img_fckeditor/file/josusetameparu.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/vgi9laegcrebt1h14utnnodbtg/vorib.pdf
    • http://esistore.be/userfiles/file/35703060640.pdf
    • https://ppuhperspektywa.pl/files/edytor/file/kafowikedukajenipedemobod.pdf
    • http://serextion2006.com/js/upload/files/wujev.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=debtor+and+creditor+in+banking
    • 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_off00018c2b.bin
1ca9bf9f74c5bb64a251502d33399875b265b1e26e24a32dcae60fa9b5382ba1
pdf-font-stream PDF embedded font (sfnt) at offset 0x18C2B 10564 bytes
font_01_sfnt_off0001a428.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A428 16792 bytes
font_02_sfnt_off0001bc3a.bin
119c5c229abab64d38a1ea00117128e8689e5f43de71ad8c8aa986c22c6c6eec
pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC3A 18136 bytes