Malicious PDF — malware analysis report

Static analysis result for SHA-256 66458888ae10a958…

MALICIOUS

PDF

74.1 KB Created: 2021-09-02 23:13:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6616a3e636f79aab1a04d6efdc92d1bc SHA-1: c8b7d6f704a7cb489ce57777b0e29976d08654cb SHA-256: 66458888ae10a9585dcfd0578297a2b038f0a97212579a75a2be5cefee6ace26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the PDF structure itself is indicative of a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://bandenplaats.nl/cmsimages/file/32949433249.pdf In PDF document text
    • https://study4student.com/cache/fck_files/file/75584924685.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/5c6f3bfc71826887bd12913925bc03a9/polubitotolavi.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/99750559600.pdfIn PDF document text
    • http://beateromer.com/bilder/file/89253064708.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/2319808795.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/7ee66857d4c71a60ccfee84f7474c203/piwazeravilabumozuzogufe.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cfd216ca4---43268934874.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/jakone.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/kavosipaweluvamugebam.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/eb3dc7de9d9fa95676bf43dccd4eb7c7/tagoxumopifoza.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/o9q7ahm1chc83lpeugk7graadm/botazalutidobimabugifuda.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/baxoxiludido.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/85101190156.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/ig746v7ljebilces5ee77dgqva/fawamopixowirigabe.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0f8e61275---49507437638.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125410f5e3df---37610734810.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/u7hi489lh5t7gh581dsjjqhnol/62413477851.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210729_210100.pdfIn PDF document text
    • https://flomogroup.com/upload/files/nagomosegudosir.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/p67clqmr2hp6fpbfegc1m0596t/37881118987.pdfIn PDF document text
    • https://strechybenesov.cz/content/womakaxokubaf.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/7cdf9e47b426d027190f22e54e6bcefa/zelesovoninuvula.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=steps+in+bituminous+road+construction+pdfPDF 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_off0000c0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0E0 11052 bytes
SHA-256: 8265da3b2e2587b7fe31c2898dbc72d8bf2944628448958b09dd3fbef0b2f4b8
font_01_sfnt_off0000da54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA54 15788 bytes
SHA-256: ab4553b91ed030a6c4c8cdb3a91bc6d0909895c8f6e3ddc7147743f10dc7b32d
font_02_sfnt_off00010280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10280 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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