Malicious PDF — malware analysis report

Static analysis result for SHA-256 29facf378fef44b2…

MALICIOUS

PDF

82.0 KB Created: 2021-09-15 10:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cea32419c05dad2ff6f94536599201b9 SHA-1: b9f1f55c2a223ed0d0fb25bc09fcd86fe44aceb3 SHA-256: 29facf378fef44b2122fdd127b2c4905a3be5c7689b7ae166aff249fc2c74535
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document exhibits characteristics of a phishing lure, impersonating cloud document services to trick users into downloading further malicious content. The presence of multiple links to potentially compromised or disposable hosting sites, coupled with a high ML classifier score and ClamAV detection, strongly indicates malicious intent. While no scripts were directly extracted, the document's structure and embedded URLs suggest it's designed to facilitate the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://hitourkorea.com/FileData/ckfinder/files/20210912_4860668BB96FB2CF.pdf In PDF document text
    • https://rwd1.thadv.com/upload/files/56645216100.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137dee7da27c---vagit.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/sekifagopirorinakixabige.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/41273387070.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/zasasinepojemivuliza.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/34744735255.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/30349185136.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/lumusarebolemoletakiv.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161418d140a8cd---golobumuredefoporawusowa.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9a6a66222---vivubinupilakade.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16131d4831081c---kenifaki.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/jusuwovazekedomuwono.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/mofon.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613399e4f1143---weriwev.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/93905759392.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/rovedaz.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/tetabiriv.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161410d9b20bc2---2802173605.pdfIn PDF document text
    • https://vendax.ro/files/file/40279520168.pdfIn PDF document text
    • http://c-six.it/userfiles/files/25103977632.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/netefobozuro.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/23289114704.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/gebovipuwuve.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa4fb1594c---bawow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=send+photos+from+android+to+ipadPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/73041921604.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_off0000d92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF141 19176 bytes
SHA-256: f187c9019cd9417723f92978413ab74ceac82404d7bfe42a547c1bef086b3d62
font_02_sfnt_off00012214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12214 10792 bytes
SHA-256: 2c19e99911efada0247d1a59ccc412fe24fe2eeb68b3f29fbf875c5cd427a975

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