Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b0212cc08fdde39…

MALICIOUS

PDF

78.5 KB Created: 2021-07-29 16:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: b730b5db9c09f055cf149ae07d4562cd SHA-1: 06b80d843c6dc9013ec4d4a80ad429114f3b4952 SHA-256: 9b0212cc08fdde399a5bdaaa1b8f7e964c1098e80c1c8bba6f227b6e8ceb4e36
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised WordPress uploads, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of external links and compromised CMS uploads points to a technique of directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=convertir+coordenadas+utm+a+topograficas+en+civil+3d PDF link annotation
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160f5fd409d0bc---zegekunenegajamegulilefo.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c10c7c3fa16---10309897482.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/37214016501.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/e2510eb054c192d42d92677b0e2c9b1c/25028728175.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/73812810948.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/nuwogilil.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210608_DB63847338DA20DA.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b637c5bd823---44783843829.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/dufubopedoxobo.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/qbsn6hba7jle2n858dlse0o2k7/6499116487.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/hd7tvi3cgi42mm25ftefg03kgr/waginajotij.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b81ec850244---39631802999.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/duluvusabomixibafuda.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/21892467988.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/votegaribiw.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/tegokovadowofokodusubi.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/8836293565.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/rpt709cask3t96mn8kn43rniu4/wusowegox.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/xafizojutejizofanaparabi.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e72b4c863---gusojubakokejulewuwer.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/bdekjeqhculpmb7qm70c0dpcd5/40553833565.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/zinepivazemeguxibisaza.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_off0000cac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC5 17564 bytes
SHA-256: 2b55d8e5fb599edf39893ff51f881d227ac1fe0e755b1653248897737f23eb1f
font_01_sfnt_off0000f6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DA 11332 bytes
SHA-256: 8fb5aa5ad211da77c20beb2deb7663e125fde159e1de3b8246c5fb331f78023d
font_02_sfnt_off0001115c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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