Malicious PDF — malware analysis report

Static analysis result for SHA-256 9775ef709990af54…

MALICIOUS

PDF

79.1 KB Created: 2021-09-06 02:37:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 125d82ac20fd8b7479f824a1cbd75489 SHA-1: 682330c4d7ca77efa6f7048c8c61074b26f9dedf SHA-256: 9775ef709990af54f7a9b30b491ae5e72130aede3d1649b8e3beca2196d95f27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to lure users to external sites. ClamAV detection and ML classification confirm its malicious nature, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://groupunsur4.com/contents//files/43455805893.pdf In PDF document text
    • http://ljjxmining.com/uploadfile/file///2021083114075642.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/36354515317.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/wawizanewum.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/16154385855.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16120e1333ec77---1436864746.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/90719348701.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/20644913779.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/kukuvetujinovexefilulev.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/87143354398.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/55390393537.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/bafotezekopibefujaxexek.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a551eca08e6---98810247160.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/17ab9aec6d881723f22cfd29350f45a8/fubikerizupi.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aeee73a5d7d---zoxakawuzabefidar.pdfIn PDF document text
    • https://www.casestilistas.es//ckfinder/userfiles/files/81474834539.pdfIn PDF document text
    • http://myphamasia.net/upload/files/pagigopagazukowixizusi.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/wijovibagafotivaminalen.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/50816276064.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=journal+irritant+contact+dermatitis+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_off0000d035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD035 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE847 17792 bytes
SHA-256: cc53361e8bee25a44639467ee15f6fedc2de1cda8b7f5ba4e82b750f9007c96e
font_02_sfnt_off00011619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11619 10872 bytes
SHA-256: 489e8c8594186302f832e2c7ec0d334efb1cfa725e8d196ce9e20cb0f27121f0