Malicious PDF — malware analysis report

Static analysis result for SHA-256 1252670178c863ce…

MALICIOUS

PDF

83.5 KB Created: 2021-08-16 17:10:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bed764d359ebcd4b318441678d6833bc SHA-1: 89f698db98ac2ef8298c70f38754e9e27da6fa83 SHA-256: 1252670178c863ce028c0160091fb7b4f0b8347d61448914c34703fda71b5aff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, many of which are disguised as file uploads and use 'utm_term' parameters, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing lure disguised as a customer service link for 'skylight bank'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://cructi.ru/uplcv?utm_term=skylight+bank+customer+service PDF link annotation
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160b8dc35dcbd0---98627891759.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086545ff0e55---85816825412.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/ea3ce7c5c01185a2646edd339a5644f4/tagidakinakuwabitesa.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/81808271772.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/a10ea3d7a32ae670d5541106888a4d08/5684962754.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/gulof.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/73582b718a2524dfff4c6fde2d75e8ed/53275668127.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/peferatiz.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609dada3abb2f---37052188045.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085ee28a9391---fukinogewopagosonitola.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/tbli9oq4aluvl35jsc9tnq0bar/sekev.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/luvodasukulibuka.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/54f461b80c705ff6a642b466f4ba6382/fanipijajuvi.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/74846379239.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/2k6tha8g5nbnuqpsugnbu4nb69/mafokon.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/lebabubebozunux.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/nozopo.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/xupiwajezifaxapigufesobug.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/derirunapetijonenebazoto.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/zifivumelojogenesabiwe.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a662bddf1da---wuwugevit.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/fabaxosizojoravupamujim.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/28a130cce07e3ff8e1075ece6354ee59/zuzalexexo.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610290c7d97ee---pitesutafugikewagubakor.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_off0000deb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB5 17700 bytes
SHA-256: ec610c3c0301174999b417634a90c79baac6d9b4db38ffbe6d42dcbc4d5bd4d2
font_01_sfnt_off00010d4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12563 11264 bytes
SHA-256: 8ff47c1dbda8749c3f8f8d280230ff4635f70ad39f3df79206d5ccbf9d8e8e25