Malicious PDF — malware analysis report

Static analysis result for SHA-256 528852d735c7a5e2…

MALICIOUS

PDF

108.5 KB Created: 2021-09-20 12:21:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: be90758b4a8554951c43e02dc562ce52 SHA-1: dd1ddeb4f022d8b41d93364b020e9e75d6667306 SHA-256: 528852d735c7a5e20a4309c09d58893dc7482a15881de44c2bb1722dbda6a099
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a malicious intent for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly suggest malicious content. Although no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9828

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://digitalpolicycouncil.org/imagenes/file/kagifezutigijetuz.pdf In PDF document text
    • https://bulgariapools.com/contents/files/24216363636.pdfIn PDF document text
    • http://seowonbattery.com/files/fckeditor/file/17986378456131664e7658b.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/76003829918.pdfIn PDF document text
    • http://esen.life/userfiles/file/rotitagutelinubega.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16134556d2d848---kizufe.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/73432899726.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/9lsna99dv1geu387fct5ltpn27/57483860357.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/lalatadusejamosuwagig.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/96540283145.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c21c13fa14---93314236756.pdfIn PDF document text
    • http://adatarimhayvancilik.com/Images/Media/files/getisurukuxodogomap.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/fakibeniposolude.pdfIn PDF document text
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/73215651444.pdfIn PDF document text
    • http://watch62.ru/files/files/74054894553.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/finuxedepetatijeg.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/13243426904.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/18896342091.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/48292842723.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/kegarimapenitubutakex.pdfIn PDF document text
    • http://totoumi.jp/upload/file/98493495635.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/romuboxut.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/zirurisumerelafizox.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/vumixodanoruwujosuzuvuno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=plants+vs+zombie+2+hack+iosPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010cf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF3 16628 bytes
SHA-256: f13b23eb0be5f88c9ab30b5c2743c3f02bbce24f37b0216cac47f3d3a92b7a39
font_01_sfnt_off00012475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12475 10872 bytes
SHA-256: e2dd4f9df13317156c157ed96896acf2415bbad9e8c0d318fb16b9d4c22c50b2
font_02_sfnt_off00013d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D81 2256 bytes
SHA-256: 4395820bf9e1bc7d4f52df130050f9b4d2262fb4c6ba4a2c9bffffdc38aea145
font_03_sfnt_off00014790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14790 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00015fa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FA2 26304 bytes
SHA-256: 77d681a9b58b6dab9ffe9065388f526f41f6fd29367167574e30012273d6badd

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