Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2c9c5c1bd5237ba…

MALICIOUS

PDF

93.1 KB Created: 2021-09-07 11:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fd8175668e08a84d31a9fe6a593290e3 SHA-1: 8b4609a7d7836ba34be30a4519db001e1ec2eb43 SHA-256: b2c9c5c1bd5237baa1380c2435d8767292dd855b229e7a6d4afc50536a3d6dee
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload sites. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c82feb9390---62713819225.pdf In PDF document text
    • http://szyuangang.com/UserFiles/file///dazeduzetiboregakotifu.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7ed6331af---49098780111.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/jeniw.pdfIn PDF document text
    • http://spiuruguay.com/ckfinder/userfiles/files/54025936108.pdfIn PDF document text
    • https://hostingyuvasi.com/calisma2/files/uploads/tewijarokadovusotupub.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/towaledaxugezixiluzir.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/84927827715.pdfIn PDF document text
    • http://inncredel.com/uploads/91253809666.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607edfdb91521---kuxusadalizabebewopavisa.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885acae0729---jubiwabovibazikafuf.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/kiwelijum.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/fb948a372ca77b7343105f7f628b6e98/29845739295.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/43083009060.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/2e558cb97d69f8978e89ed8843c8aae9/kewurawuviwenodabazugov.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/kozed.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/rizimoxisa.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec417feeb92---duwalatizede.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/nitunatokenu.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/50826109310.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/wurebajotumojoralaxer.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210813061553.pdfIn PDF document text
    • http://zae.me/datafiles/file/tuxofanutijatemupaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=kashmir+history+pdf+in+urduPDF link annotation
    • http://s250801404.onlinehome.fr/img/uploaded/file/83117850895.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_off0001000f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11826 10788 bytes
SHA-256: db842fe55c95c96768b3084eea00edbde38baf1974279ff940d285311c8968f7
font_02_sfnt_off000130d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D4 20456 bytes
SHA-256: 4cff1fa683f74ebcaadb5ad602af206c8c64230acef6e0fc4add627208aaf64f