Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb88d54f92a1ce10…

MALICIOUS

PDF

78.1 KB Created: 2021-09-17 16:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b9628d08cf9fd364d6dfbe8ac9da6025 SHA-1: 58c7382a99dfe858afd746b86bea94a3b9e6f085 SHA-256: eb88d54f92a1ce10f269928fa37cff80372b5eac9d8c93c107a330803fdb4621
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external URIs and links pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to lure users to malicious sites. The presence of these links and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://nomylo.ru/uplcv?utm_term=bluman+statistics+pdf PDF link annotation
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/4apgofbuf6hlfbohk9keihh192/fabefovur.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/161363d51cc1c7---lebur.pdfIn PDF document text
    • http://tuivaivietnam.com/uploads/files/9508770440.pdfIn PDF document text
    • http://globalbizkorea.com/userData/board/file/63033391756.pdfIn PDF document text
    • https://thepainter.asia/upload/files/bojobinuzojimog.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210901_97C264244E4FFBFE.pdfIn PDF document text
    • https://cartolmania.it/file/rerimidonadebokusutijajur.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/zifavato.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/vezulasonoti.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/73901041572.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/80505508698.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/77809499282.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/6b2b318741e4cbd1ebd96cb1d9515470/86629137514.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368712b9b0e---sogunitazu.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/43993860239.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/bf39efe4adb1770ec05ed3ff76adf34e/3591563274.pdfIn PDF document text
    • http://scarpatti.com/files/putagugisor.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/15498127147.pdfIn PDF document text
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/padodipisevexadedonav.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/79519209205.pdfIn PDF document text
    • http://termocity.by/pics/files/xawewara.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_off0000ca0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21C 18548 bytes
SHA-256: dc72013b4f5b2496b77a70bc698eae66892d40734cad0251fe7fdc1f71950c88
font_02_sfnt_off000112a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A7 10580 bytes
SHA-256: 3d59b387387e1eae5de69342f8a9dd9b3851770d97c6637c584af823ebf2ab3d