Malicious PDF — malware analysis report

Static analysis result for SHA-256 a93cb4f8b35a58c8…

MALICIOUS

PDF

85.9 KB Created: 2021-09-02 03:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d71753909f282ce1f13492db84e31bed SHA-1: cdca7deafdd28e77a0718ddefd3c8dd09ef1bddf SHA-256: a93cb4f8b35a58c8205c062ed1d719604f5096e2988ededdc2596ab0a17ee4a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=where+is+the+714+area+code+located PDF link annotation
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/cvd7e779g3ed9g3mhae5444o97/12889135504.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/toblhnnd3kit6lrgrqned7t0td/43579923376.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160881aea1a9c8---mopakalenutemojanuwo.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/badinejaregalowibusekeveg.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/a5703befc7990343710cfc08ffe74036/11182590941.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/nowufalapux.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e60ee10723---dewozogufe.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/2f7e0d822688c0367cefa607fbbbf482/jedoxasirogizetuza.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/gifaxaluwogimedufuma.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/97d907821b2714e6f1d64f92879a1cc7/90929920348.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de31bb8bd34---xevuxawutines.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/mokewovaresadixopu.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/e67dd6053e1419f9c1c26e20199940d3/91859781914.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f56bd2d8c9c---memutegekavagamejuv.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/41456850281.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/jukekiwasujenitulujibo.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/52322115910.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/6qnuoa2vfngbf57n8ldbf3rvu3/95937207014.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4cce49009---suvexixutedidufel.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bf96e6b098b---97200678197.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/wurugexisufuxobasuj.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/44309194733.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210605214320.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/7kp7e9acc3suvgrh8s9s2kjch4/gogetok.pdfIn PDF document text
    • https://ikima.fr/uploads/file/texijatomesi.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_off0000e34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5F 20524 bytes
SHA-256: 3dc1f8b91712803bdd837c8cfd1afcf6b105828774c715df7dba05088e3d166b
font_02_sfnt_off00013191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13191 10536 bytes
SHA-256: 650c422ddd7747ba3b3273f655f0ec542e8f2a4aae31e11148744d43dba4cad1

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