Malicious PDF — malware analysis report

Static analysis result for SHA-256 8054ab7c88888567…

MALICIOUS

PDF

94.2 KB Created: 2021-08-02 02:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 46f6aa33719dc7636bbd006aefbb0976 SHA-1: 9507002d973447949eee3755d2535be4945347c6 SHA-256: 8054ab7c88888567511fa8518218585067334f15b942e4c909f98ac3030a5ae2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate a phishing or trojan payload. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://queure.ru/uplcv?utm_term=ar+rahman+surah+in+telugu+pdf PDF link annotation
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/9kslgfffl9pm7b857uepi88cl2/pegon.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/ragijogisufo.pdfIn PDF document text
    • http://101balkon.ru/upload/files/fovipekin.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1609487507dce9---kinamanuzuxuronajasud.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6725b38dd---kofipotegegewe.pdfIn PDF document text
    • https://baptistfriends.org/media/31224681083.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/jebugedumej.pdfIn PDF document text
    • http://dzbnf.com/upload/file///daxamifomujewupebunaraje.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/92851904663.pdfIn PDF document text
    • http://khacdautron.com/Images_upload/files/72819093385.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16078517f03948---nipiwirulozo.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1cddc72c98---xozakapu.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/4489b5ef1d797ef72fc9464c17a45ccd/rivolikitafogumogejo.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a68a0db7ab2---85960874772.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607804b7bcfad---24687010247.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/0kj9on9gkppbm7aujv64rgacs7/wumotudizegopa.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/47442763458.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/osujjvqneriid91d1ml899k23g/29255851834.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/95746309010.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/9a8560645a31bf0a6150b083fe526ba7/bexejavelunanixaxodadep.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/97699713752.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/88694875425.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/kixakegepokovikasugokux.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/f00572947881619945471b1af6a84937/12771332078.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CF 18672 bytes
SHA-256: 742851ce39ae301183c11ead79509dcbfcce60883816b908af095fb1fe86244c
font_01_sfnt_off00012167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12167 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001397e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1397E 10908 bytes
SHA-256: 2b592c088c2ac99c89485c970a8c8424342b11cbcc1f189a4793be13ec6a198d
font_03_sfnt_off00015255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15255 16648 bytes
SHA-256: 0c6e302c0f1079a7150d9ddfa9d141eb3eec8a62d73c9ddec5eee5f7e414b47a

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