Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a1e7f2cecd589d2…

MALICIOUS

PDF

83.4 KB Created: 2021-09-12 21:32:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cf5f4fa14e991e0b85cd298937d39876 SHA-1: 952a0156d712834419290c2a9917bee7e3a8e9af SHA-256: 0a1e7f2cecd589d256bd87d8e83d3bae96fe87d6585cb6b69ef3df49e9957c86
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous external URLs, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cructi.ru/uplcv?utm_term=smallest+atomic+radius+in+group+6a PDF link annotation
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/44878115546.pdfIn PDF document text
    • https://koparieshorvathbusz.hu/files/file/pewexititetad.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/nizarugeju.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9b12e9f40---23563601306.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109070522135401.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/e9a064a27da1efb056cab400f2355dd1/dobimotofiwero.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/jalizitebenamupufixo.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/8095326378.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/9774827113.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/pisimi.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/85063371513.pdfIn PDF document text
    • https://unovosti.tv/ckfinder/userfiles/files/fupejekama.pdfIn PDF document text
    • https://dp-silver.com/userfiles/file/26890638268.pdfIn PDF document text
    • http://apex-architect.ru/images/file/54292343301.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c546b9471e---76898707467.pdfIn PDF document text
    • http://kastely-vacduka.hu/fileok/file/47620248762.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/12467687296.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161310e21a1833---4696100772.pdfIn PDF document text
    • http://fitviewer.de/files/file/46024508021.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/h2hv4j4cl1p53qo6mlcsfql5t3/79943548374.pdfIn PDF document text
    • https://signika.pl/Upload/file/zugobibe.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/nejotobemopexol.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/61279393238.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/99282169176.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/47544354194.pdfIn PDF document text
    • 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_off0000dc48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC48 18940 bytes
SHA-256: f88c3a9a7218aba1243803cc91a0a7915bbf6b69dfecb26894118a27cc7ecc7f
font_01_sfnt_off00010db3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB3 11200 bytes
SHA-256: d5d0867eed08c89df7677c2c5de2e9beb74da0c66c55aea4a8e7e4bea1b546c6
font_02_sfnt_off000127a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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