Malicious PDF — malware analysis report

Static analysis result for SHA-256 24dad4607f2a6e7c…

MALICIOUS

PDF

82.5 KB Created: 2021-09-20 22:32:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 95da163784aca3547144c27e3bd78c2e SHA-1: 3535839bacc0dfb4b0a68621edf4215528ad1839 SHA-256: 24dad4607f2a6e7cdb68b71fdb02afa6abd69d30b5ae104feff5c9f93b298db4
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://zenithoverseas.com/assets/userfiles/files/90886917248.pdf In PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/xemobirorazaxatidikuw.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/91003115142.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc0f576a8f---naromijijizirowawaxem.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/zukotezowugodenosavefil.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11540654316.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/40708447227.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/leluzagabuvitatiwupofewo.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/3b7b642997070a01c45d2924ade1d392/fodudunoxinogojinosesew.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/kedavoxuzajisoniwaf.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-8/20210908154950196208.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e391eadc9---37373658357.pdfIn PDF document text
    • https://seikai.jp/free_images/files/zubuvoboralikekumujokidev.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/runewuzusalipu.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/33362914655.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/76593812392.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/benez.pdfIn PDF document text
    • https://e-room.co/userfiles/file/ziweju.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/tapez.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/jopibirimudagigezunar.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/gewufekamor.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/45646499455.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/vunigubisovivevin.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210913165647.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=xiaomi+watch+price+in+bdPDF 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_off0000dc11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF428 10796 bytes
SHA-256: e343e27bb39feb590fff50143f31d83fa2d1cc80b54caa881936420fab495a82
font_02_sfnt_off00010ca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA3 18752 bytes
SHA-256: d8084db7dc25ee0404da981a7961838b1c25a631571efe9ddf7d3d8613dbb667