Malicious PDF — malware analysis report

Static analysis result for SHA-256 c97252009ec2a66a…

MALICIOUS

PDF

85.4 KB Created: 2021-09-05 05:34:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 8ee7fb0df2c13299d023cc13b6a0cf1a SHA-1: 4d2106ef798efef4c6d1e59a18bc589444dab97c SHA-256: c97252009ec2a66a55ae6894b6cf1c82348c05e5613bae0bf09b73a0f5a0b467
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pixomot.ru/uplcv?utm_term=afrontando+la+esquizofrenia+pdf PDF link annotation
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160e6d0bc70dba---xezilapezabu.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/8953adc4a49a1ccba278364de77ca484/78940333520.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/pelusafuparu.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/89a8a77fc19m5psfo2qlr76ha7/64690994412.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/8c0c88f5bb6c8ccf7c7149d34f4e47e9/74331880744.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/bomubilexepavibexurer.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ae592a624---resikozirivazufatizedup.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160efeae8288f3---namevujaveluterigimu.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/7cf901b35af4c164bdddc6134385292d/rekatoluvudep.pdfIn PDF document text
    • http://taumed.kz/upload//2021/08files/210807021700985531166gz.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612c0a58687ec---refudogewo.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/90425496669.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8e1a151ffd---pabuvilixobigukanafo.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607616ef336ab---tiruwogizetebuv.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/49292349789.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/d180c510c5a2d4dfa9c1c5a9a0483d0c/95575889008.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/pirifamodebolubevejux.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/fuwevajumopepuvobutume.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160babe2c8b48c---38231745289.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/lhhgdsj5e34fh0vdv4hm92dk51/77722369844.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/76706104597.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/kuvevopuzod.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/xegaxapusow.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_off0000ea07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA07 10780 bytes
SHA-256: d4fb68dadf702b8f9d67709dd8fbd0e18cf05d7191f7990721ce9093993d0e1c
font_01_sfnt_off000102c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C6 17344 bytes
SHA-256: 0cf0fb14e4cb75ec422263f59529e6e33ef1bc651d9217e4daa8bd3ddaa808ed
font_02_sfnt_off00012fd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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