Malicious PDF — malware analysis report

Static analysis result for SHA-256 656f32ce5593a6bb…

MALICIOUS

PDF

75.7 KB Created: 2021-06-26 05:25:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d0c220f4eb5fb49cb1eeed8c668cf5d4 SHA-1: bb9f702783bfec1f8004e4bd2266f622f441e554 SHA-256: 656f32ce5593a6bbe3d84ee007093e9e9fe4239c443e77b29479e789381b027d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or link-farming scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to malicious sites. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://duszek-lasu.pl/userfiles/file/76072155644.pdf In PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16078a32db83e7---7465945056.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/274ecad35a92c9504daaf4e90121c936/70054818360.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/2df6e292f6df96d5bb257f3d82bedc18/zikelirazosuleba.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/98611b0aedd71b72271b84c6acfd8575/fonajamavetava.pdfIn PDF document text
    • https://alutat.com/data/file/54799833388.pdfIn PDF document text
    • http://insureacompany.com/userfiles/file/50385891730.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/jefuwisigaxanexofetawija.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/52747342104.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/pephsqc2g52fsgp0fmlh1u83v7/wonatisosodobujubilo.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/21364107319.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/jimamisumogur.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/9f35ac04614fe93e49aabf6ddc0ebe74/41118241717.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/ug4oltclospqtrh0gmdpmv2m63/faxovaxupavezet.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/13017991480.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b11e51951c---66439470927.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/dajus.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/zifebanitokureg.pdfIn PDF document text
    • http://goref.ru/files/file/vugaletakeb.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/28717658337.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/i0mnd44s4p7q6e88d8f0tldth7/53413691972.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16076e3efba8a4---13465615759.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47af2eac24---68060986437.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=allegany+county+paPDF link annotation
    • 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_off0000c67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC67A 16796 bytes
SHA-256: f2927737b880afc362dcc2cb40bed370e29165355aa52020457f3cc3ef36eebe
font_01_sfnt_off0000f246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF246 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5D 10384 bytes
SHA-256: 4378fbeb5ca42573fcdd5c711df67de1ba47d73be65f422a124b83797be3cd2b

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