Malicious PDF — malware analysis report

Static analysis result for SHA-256 4716f63b9f42a82c…

MALICIOUS

PDF

81.3 KB Created: 2021-09-15 20:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b2e9d279c0df68489a0282e7db00782e SHA-1: d8246cae46d0ae70fb6d5f391ae132c69e53d15f SHA-256: 4716f63b9f42a82cd709cb25f8f7c641871a0e10e377a7f61aaee52524a5beb9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document uses a cloud document lure, impersonating services like Google Drive or SharePoint to entice users to click on embedded links. Several heuristics indicate this is a link farm hosted on compromised or disposable domains, designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://planningpvedh.nl/ckfinder/userfiles/files/1781434075.pdf In PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/vizaxitazagof.pdfIn PDF document text
    • https://grnca.org/img/files/files/dokedupaturukegimif.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/pixuxejexewixalolad.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/xujapopalobuxi.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/20289831521.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/87770743176.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/30151807003.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/50385615007.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/2f7a5b1da4402259ac381f51dfdb1c5e/todefetinapowudixukitape.pdfIn PDF document text
    • https://tekartltd.com/upload/files/nifelimenujona.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/dozogatovexelibobivabokin.pdfIn PDF document text
    • https://seikai.jp/free_images/files/41381570904.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a48060627---75465908338.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/23369251801.pdfIn PDF document text
    • http://iltorg.ru/upload/file/35485761010.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb9c1702ed---rabupazirijakifomononiz.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/dadelesakokoguxibal.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/7092643728.pdfIn PDF document text
    • http://pevak.info/UserFiles/File/fizulasat.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021091600271273499.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/19429819845.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/97714330916.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/27451936396.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/27718185383.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/1493288629.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/xotogugulugara.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=pc+to+mobile+transferPDF 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_off0000da1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1B 17660 bytes
SHA-256: 35bf1ec343dd943591dbaa34f1fe082b54dec0411a124214b8483291955776a4
font_01_sfnt_off000106ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F05 10640 bytes
SHA-256: 4ab6ea132bda78dd5dfe56ed9dfca2106f93ea3da5887232c24b06b0ab2e0de0