Malicious PDF — malware analysis report

Static analysis result for SHA-256 4615e6625ea49cb6…

MALICIOUS

PDF

82.1 KB Created: 2021-09-17 23:18:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5eb3d063f04fe2b17cd6afdcb4010b5a SHA-1: 0a2b53ec35c6fc507cffd465e09c7c2f11b8d4eb SHA-256: 4615e6625ea49cb6f038858f910fe0470c145f8666caca0d31aa44c34b172977
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on various domains, some of which appear to be compromised CMS upload directories. The primary purpose seems to be SEO manipulation or distributing further malicious content, rather than direct user interaction within this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.somdattabasu.com/fckimages/file/16845226205.pdf In PDF document text
    • http://rabwork.com/media/file/gufuxusogawaru.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/53748289051.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/97326183317.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/4fda3405e2fc6675791849dc97db60bc/fizodibenitotujukopakedij.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/79896194027.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/sumutivizunironozetig.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351fa9cecb0---86240414845.pdfIn PDF document text
    • http://dytac.hk/userfiles/60862284825.pdfIn PDF document text
    • https://arerp.kr/data/file///64550641661.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/waxafizilisegifagitox.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0f093ec86---mowufefemuxinedifata.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/texegutoxidowutu.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e3de20268---20272483453.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/34131480846.pdfIn PDF document text
    • http://dyccpharma.com/upload/files/62700270534.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/dagoviwefarokiz.pdfIn PDF document text
    • https://superpart.com/files/jirarokirizoripumijefose.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/xosuwusafebilovaxutir.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/79546055815.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/terofolajawetapevixikodip.pdfIn PDF document text
    • http://www.catedralirodahaz.hu/data/editorfile/32066433357.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/fokifabafogukabevirujiz.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/diduboj.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/cda1816783ad36ef97e7677c0ed7799c/muwisilegogimivipokubajon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=the+return+of+martin+guerre+natalie+zemon+davis+pdfPDF 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_off0000dbd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD4 17208 bytes
SHA-256: c73362a28b8db9133257349a204bb95b44679ec4fe6d68702ce605210e0251cc
font_01_sfnt_off00010859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10859 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12070 11132 bytes
SHA-256: 08cf29d66fb4daf51c12641a2f0e26b073fda6cbe5f4ec24882369fc4d7ec7f3

Open this report in the interactive analyzer, or submit your own file for analysis.