Malicious PDF — malware analysis report

Static analysis result for SHA-256 15fdec2a2647bad6…

MALICIOUS

PDF

86.7 KB Created: 2021-09-10 17:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4ab4e6c9f5af2ffded8a41f08ad6e715 SHA-1: aeadfb6d9610a70864e687d82d76811bc53e37c2 SHA-256: 15fdec2a2647bad6bbef093c627d8d10c424eac94932427eb2460a6de94bd4d4
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress upload storage or other disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://dichvumucin.com/upload/ckupload/files/sijalijedabasolinemogesu.pdf In PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/libabumunilebimij.pdfIn PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/vadidozoluxuwizoxeta.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/pevavomo.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/62278040345.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/5812378433.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/33781339610.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/puluxoxaxidog.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/21338845208.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/sikawit.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9cef95dea---jajatuwizigejolewariwo.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/fatutusivumujo.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/mitaxivamanezejusuko.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/73372251614.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/basebijenonarazezeseto.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/31187586349.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/i1fjlpft2mapp28aim6j2oluan/73350293692.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/67038470988.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/talitufefakolumosigu.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/11109312137.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/16472543727.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/fokudidizoxekuvolanefuge.pdfIn PDF document text
    • https://alpinashop.bg/files/xibirotado.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/64210802680.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/311272177.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/80698062566.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613207a9314be---9118067449.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=best+free+clone+app+for+androidPDF 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_off0000ece8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE8 10668 bytes
SHA-256: 898eb72d7e433df5daf0d2651e1db9b0e0c21cfd8a54d49c8331ad8fd0b12ec4
font_01_sfnt_off00010581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10581 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D93 18112 bytes
SHA-256: 466afecad936dd73d7dbf1bd096379e50fab3aea79aa7c605783333705e15b14