Malicious PDF — malware analysis report

Static analysis result for SHA-256 33e4768596aac381…

MALICIOUS

PDF

93.0 KB Created: 2021-08-05 01:30:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 768824f9e187cf22cfe45a8f6b364850 SHA-1: 11cbbc9327d4871c4d445c82d85dbd6b417f032c SHA-256: 33e4768596aac38166d50d226c7e80e986191743a1e6cba1f25b48edcae38fc7
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads, suggesting it functions as a link farm to distribute malicious content. While no scripts were directly extracted, the PDF structure and embedded links indicate an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610644e5a61af---45609963021.pdf In PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/78685579693.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/sokoxubisozex.pdfIn PDF document text
    • http://terminsk.by/pics/files/rirefodogetiki.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/mipojokolitesewoseji.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160989775ca5a6---18580492799.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f36ba404c9d---614032913.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/29646406005.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c83cb9e95b---16848917085.pdfIn PDF document text
    • https://mfdesign.hu/files/file/55403942917.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e754e374d9---43214650892.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/49025061015.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/pulenavigar.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/pixinezirizuramijused.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/foliguvesatigoga.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/96976860023.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/54233c555fe28a2194c0149e094196c8/bejalajufuwasexij.pdfIn PDF document text
    • https://adikketiga.com/contents//files/83782214131.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/7592390571.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/56735343118.pdfIn PDF document text
    • https://energooptima.hu/upload/File/76477677233.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41b7eba451---9230952990.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb2628df58---4425108184.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=formato+de+mantenimiento+predictivo+excelPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6B 18560 bytes
SHA-256: 101f6861dfab5ec5abfdeff1b4a7a291bdf542e7d17779cbd2ad9e682aaeb846
font_01_sfnt_off00011d70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D70 10652 bytes
SHA-256: 0f5205e722ca1ff613c9befaab410cfb323f255d406999fdd97cd11cd614f1eb
font_02_sfnt_off000135c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DD9 16204 bytes
SHA-256: 2f37ea1b11ece644fef2f420fc5d5e29c860255d372ec3a711666e2589675489