Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb8c41d5ab96cd65…

MALICIOUS

PDF

101.4 KB Created: 2021-07-09 22:18:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 686869ef35f11778e05b017558e6b8c4 SHA-1: 1fe0f91fb2726c301242cce25624e21771f491b7 SHA-256: bb8c41d5ab96cd6595e23a979b1ffb5c5600178abac315b697b1ed853804b806
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9787

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://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b71ec087240---wabuw.pdf In PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/4150580720c9a6ec2a812f04d0903cac/56988356190.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/1ht5m3qrqgk0maqtutj71fje09/jotofudazexuxakax.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/c373fdb76b97ab385a443e0753a2f55e/siteb.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/aht71octqkf13v1mmq9iurhuf4/tasexuxebufegebo.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/xekuloz.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/6816343eec19fde94e5433a0fe483e6b/47469831260.pdfIn PDF document text
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/33a269a855ba950ee5801732d0c6c587/81715637735.pdfIn PDF document text
    • http://vizcsap.hu/files/file/37534213224.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/85856309360.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/koxiruvijimenob.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/sedoluwitozirirami.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca46684f3d---xajuvagozedapobokuxep.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/ba0568c06cc8af576a92dea66734f748/56484867554.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b1d5d96a6---27206973065.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/1cedd056afcb3649186efe640f45a63d/29287195568.pdfIn PDF document text
    • http://unsersohn.ch/images/file/45454690533.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021051612203039.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7936d202b---49222246545.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/560b88520f068f451e3938484c8a7220/17651864113.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/6bc6755ebfa06de9bad2fa2c6687456d/sodunexujuv.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/080376ff51d2d0969ac9a2545517ec8f/44598399569.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/lejesakovuko.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c69d73eab47---tazolevovijomexe.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ddc2c4cd4---44859448896.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/gadisel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=next+food+network+star+episode+guidePDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/40df180ff16ecac7a0712368ea783ee5/jerigomobatik.pdfIn PDF document text
    • 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_off000127f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F0 17572 bytes
SHA-256: 7d0528ee8238d9be9f199d680c1229b2228759499abd4cda22792e979f4b8ed3
font_01_sfnt_off00015655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15655 10984 bytes
SHA-256: 8674000e4bc8b55f08cf494c093845a013d24bc18a585154bba92feccff6e24e
font_02_sfnt_off00016fe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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