Malicious PDF — malware analysis report

Static analysis result for SHA-256 908df03bcbd6048f…

MALICIOUS

PDF

85.5 KB Created: 2021-09-16 02:29:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 778fbd7cd409f001b4bf445bc19ed7bc SHA-1: 82eb0c39f7d2189e5c4c29fd36034b4a7c675868 SHA-256: 908df03bcbd6048f61c506074581895190e6f81d4fc89daad10a97e5df6a91fa
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such links, likely for SEO manipulation or to host malicious content. The presence of multiple PDF files in the URLs suggests a campaign distributing malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pastijptoto.com/contents/files/25200627738.pdf In PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b67f4f3fd---zujeguxenopivunikuvupeg.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/b73d2a06deae2faa8e04feda79f07809/21511330989.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/bowizutexevob.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/gerebagerirefegav.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/lixuwava.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/20046007369.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/moxiki.pdfIn PDF document text
    • https://shivajigrihnirman.com/singhania/downloads/file/89600407069.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8a0be67c1---27116308629.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/farajejixofigoxofajexevet.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/popuzovekemajawodatekow.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/gukeleg.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/zapurajutonalezuruze.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/bbf6abff97dfed7b7cb24f0284fdd80d/88498708478.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/48340602867.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/fiwadoruwijepapatetu.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/7a7f830c0746d43ff44e222f4d4c9432/8656720489.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/xevafaropesuxaza.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109072315173802.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/mekafumowironege.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/35842709340.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-07/images/files/81840519152.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133c010aac65---39120351208.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=instal+aplikasi+exe+di+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_off0000e7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E1 18564 bytes
SHA-256: 394a8cae452f271cf0b08d84850fc87a8e3c41f573383fd03a63225158cfbb08
font_01_sfnt_off00011824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11824 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001303b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1303B 10532 bytes
SHA-256: 981710f72a92e89b344ba285760e262b03a2ca5ead2d0340061eaf404c6414c2

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