Malicious PDF — malware analysis report

Static analysis result for SHA-256 193fdabb718440cd…

MALICIOUS

PDF

72.4 KB Created: 2021-09-18 15:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fddadaeeac09cc70456e860bf43b8145 SHA-1: 6502cd521d6b0dd00660061d92a4491e1527c763 SHA-256: 193fdabb718440cdbc48774cc7c1ab78f005d064317641b44eef8020a7680f91
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm for SEO poisoning or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are indicative of a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/4fglak7j57kgu1kft27cq41q3o/koxuse.pdf In PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/718b078b2d276b89e92f4bd1c3eff702/9412455175.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/69864119767.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/fepokuzusizotixadulugafub.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090118083088.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/papurodigeboteg.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/vatelujobogetibu.pdfIn PDF document text
    • http://flomojapan.com/upload/files/wugepifudu.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/pomamoforiz.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134a9e86f259---fabawagimukire.pdfIn PDF document text
    • http://zl369.net/userfiles/file/36444579800.pdfIn PDF document text
    • http://mweb.cz/images/file/56364918949.pdfIn PDF document text
    • https://morethancars.eu/uploads/edytor/file/32943556779.pdfIn PDF document text
    • http://www.moyekolodin.com/files/tawupepenagixepajarumanar.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/24440247982.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/rixopivawazewijo.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/69435811608.pdfIn PDF document text
    • http://www.zdravotechnika.com/ckfinder/userfiles/files/89534119287.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/40133716979.pdfIn PDF document text
    • http://video-cycling.de/files/file/xuwexofo.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/kimafepuxaloxejiperol.pdfIn PDF document text
    • http://kleni.cz/userfiles/file/lurafilatenagujepiw.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/59370442184.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=watch+free+hd+movies+online+websitesPDF 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_off0000ba13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD225 15812 bytes
SHA-256: 01b191140fb354a950a94985b13c77297c33ac4dabaea9e6a7e40a418d2d0ef8
font_02_sfnt_off0000fa68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA68 11028 bytes
SHA-256: 08e7e4098faac4467d6e5ae11490ec4a981aec241103d445cb2412d9f2b294ee