Malicious PDF — malware analysis report

Static analysis result for SHA-256 edce343e67cb5741…

MALICIOUS

PDF

78.3 KB Created: 2021-09-04 10:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 541822c46dbc99c10ae6c0f9da3a607c SHA-1: df9d7b8ce2fb728dec385315d7cb5ce91a2a93b4 SHA-256: edce343e67cb5741f0aa2e587bf08f0ad7f5471f765741c5b3d719ed3bcf6ee6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains a link farm pointing to various domains, some of which appear to be compromised WordPress sites. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to phishing or malware distribution sites. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or content-luring attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://wsm.hk/images/uploadfiles/file/nusixifogefofugaz.pdf In PDF document text
    • https://atcotourismtravel.com/userfiles/file/boxopifivevawuz.pdfIn PDF document text
    • https://orangerun.re/photo/files/sokawanirise.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077185327baa---toxoxik.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/90536018171.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/54705928819.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/41975662167.pdfIn PDF document text
    • http://sweetbasketsbyjackie.com/clients/864293/File/wurukujivukim.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/cba06edba881e1063e081733249df4eb/76355504776.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/25168810874.pdfIn PDF document text
    • http://toonesk.com/upload/nekitizinas.pdfIn PDF document text
    • http://marty-triple-m.ch/inhalt/files/wezufozitan.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c61064610ad---tutaposuna.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/d78f90d71e6b97c0bf10bd7ee7dbd249/86599240431.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/kumoxanimuxonajabafiputov.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ed3cd184e---rumijejudunubanixagiru.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/99061175552.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/hkbk4dncsl7irajpc8at3iergi/dewibowukebigo.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/43b2cef7c9b702f15e876d9cf4bb2447/20910692370.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/63876384847.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/93205b1c2462a0cb6f5a010fc02d8725/90724919009.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/45428212218.pdfIn PDF document text
    • http://thelewisfamilyreunion.com/clients/c/ce/ce72a6ed4f7059d305e3bbfb121cee90/File/pivagizomepe.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077101a40705---96755523546.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/q1pg8uaudfn95hfrg56lb85uf4/rimulawodezixujajurobed.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/71599993944.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=acer+predator+helios+300+ph317-52+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_off0000c8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CD 11276 bytes
SHA-256: a69f2692bc365dedf7e302efc9d9ec82c9d9ddfa1544d1e6b8d99eb9ea9b2514
font_01_sfnt_off0000e39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39B 18400 bytes
SHA-256: cb4a2562c0176afef8c22c3645d4ca744abfc5e3ffc041b7e0b5844a0e0a4059
font_02_sfnt_off00011394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11394 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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