Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b417bd7d75a2548…

MALICIOUS

PDF

89.7 KB Created: 2021-08-05 13:07:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6c36f1ae8c77a41443aa3a60346ba6d0 SHA-1: fdaed6e9350bb8f1d1b1e4b992c2dc00f073d43d SHA-256: 1b417bd7d75a25488e2f5be8aed2a80270dfe05850bd6dec524a64eb613a5d11
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links, with several pointing to compromised WordPress sites and other potentially untrusted domains. The primary function appears to be directing users to external resources, likely for phishing or to download further malicious content.

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://capital-tic.com/upload/ckfinder_temp/files/20210528232633.pdf In PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/3327133957629ab03625b228c7446d6f/mugawodemukekasek.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/podixizesugorose.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdbb1264f8---didijepelibewadasiniv.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/b83056bc9c960f6a6a51640e4824990c/46736942055.pdfIn PDF document text
    • http://btfa.tw/upload/files/94207008478.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/0ksqghjuqaknnnshflb39m5ck0/pesejuserijesutuxe.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/58684312561.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085448b7f042---64120016368.pdfIn PDF document text
    • http://sunarfactory.com/userfiles/files/10357305781.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/t6sscnm0hp34qjodcl5ppl1mu6/50835304667.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/xobobari.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/999e78eb5d3bbf7edf4ec337c6f74fa1/fadizoli.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/mifinifanalikazomebaloxu.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/firizezudoxuvu.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/datoraxizogeginetupisin.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/movutawamanajibuleve.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/64601375785.pdfIn PDF document text
    • http://nakakinpump.kr/fckeditor/upload/file/31390605391.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/99076793589.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/dqnu7b2ki8nrgkem3s86htss0f/27008001614.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/kawiberufeg.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/2415aff990cb91b635f0b164312c6c7b/6096781256.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/73699331077.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=d+company+movie+2021+wikipediaPDF 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_off0000f74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74F 10916 bytes
SHA-256: ee3737f28d09d865b870b6f6019e5b857c0bec9710a7838cfff25177f77d8a55
font_01_sfnt_off000110af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AF 17776 bytes
SHA-256: 5f205f21029e69c1f75379fbed50cad82b106a083b6644fa0c3debcc0f5a4cac
font_02_sfnt_off00013f52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1