Malicious PDF — malware analysis report

Static analysis result for SHA-256 d790d3607f2713c6…

MALICIOUS

PDF

79.1 KB Created: 2021-09-19 06:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 13688e0aef4be60c434e51c6203f1aee SHA-1: 13d03f4f04d5684bed422e2cd0353c2fb7e04d07 SHA-256: d790d3607f2713c66657dedfb5552d1aa255f90e269b1f6351b980cf6c22c776
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous distinct domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure itself is designed to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/viletinifojalimurasab.pdf In PDF document text
    • http://duetsepolno.pl/userfiles/file/97868527027.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/22851494344.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/34987095979.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/89562320468.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-03/images/files/40727594638.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/dopotezojadasabo.pdfIn PDF document text
    • https://csn-alliance.com/data/files/92662973942.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/f99b3e5952498b432f5291360c9a74a2/50757100835.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/zomejabatiset.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/89373688733.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210913161948.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be4de8a75c---15322251205.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/63380837697.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210907221514.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161415fda40b0d---77389411434.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16137cc005f57a---94502857651.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/deputozizupuwoz.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/26005356341.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/64089126536.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/90360461954.pdfIn PDF document text
    • http://pjteam.hu/uploads/tasidisa.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141117a3e2fe---mivasojizis.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/93459865963.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=hacked+cooking+fever+apkPDF 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_off0000cfa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA3 18432 bytes
SHA-256: 4116b26590bd1c1621569f2c6f26215b498932980b546206a52e078464ed2c3e
font_01_sfnt_off0000fe64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE64 10632 bytes
SHA-256: 4581d840519480b05dbd05ad37640e9bb3c47d3c67d59711a494b445ee0437ed
font_02_sfnt_off0001169e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1