Malicious PDF — malware analysis report

Static analysis result for SHA-256 311185ecd982b1ed…

MALICIOUS

PDF

93.5 KB Created: 2021-09-02 04:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 37c64106696bd39a42d16ab721234713 SHA-1: adac0d2ec9726d30a8bc719d8f47ffc80be2a1a5 SHA-256: 311185ecd982b1edc5e0fc23fea4f6b380a346d8c0d149c54418f8f25cb50942
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • 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://backkwang.com/userData/board/file/sukumunamabevotobufuni.pdf In PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-7-9/20210709113353573342.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/80210279798.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c83d9c4e40---2034642897.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/h1fllt5tko3hor1dqm3csb5moe/xipobig.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac93b016f4c---47198709274.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/58818504486.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/pixabadosizofurobureja.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/59217731254.pdfIn PDF document text
    • http://standdominica.org/files/files/serikin.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/46827511041.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/94874001388.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/jujosupigulelusavi.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611795016d945---xugilebexu.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc51f1d5b9---gapaduvakirumetuxodema.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/3c9d80290b5132d833c26be913900435/refajaxanonexigipa.pdfIn PDF document text
    • https://uangraja.com/contents//files/97736659916.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160707dc07af36---45352278030.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/bpgjop603s2i8a9acuft654n71/tavuxajo.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e52c14e98f---50171035538.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e23b4a1407---fanelevizobapokotulewa.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/wurigogekifej.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/82539d62b36000c4a5c081ec63430c94/kimesafikebe.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-1/20210501131728119897.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=internet+censorship+consPDF 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_off00010bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAB 17260 bytes
SHA-256: fbd07a4f48942c3a12f773be285335c8045a1a08fa663c69264e591cbe69b28c
font_01_sfnt_off00013808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13808 10212 bytes
SHA-256: 1c2ff3cee618e6c60997e74d230a5e9c93a9e0de5d3f95ab2f118f78d23f66d4
font_02_sfnt_off00014ee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.