Malicious PDF — malware analysis report

Static analysis result for SHA-256 b044215b4c77ace1…

MALICIOUS

PDF

96.7 KB Created: 2021-09-05 08:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9623d2485726774f92411b6eb56e87b8 SHA-1: d5c63f0de045a684e713b178cdddb3e432ac7b10 SHA-256: b044215b4c77ace12399a3c2d21c9a1db4bf2521d7d07b34a1350373f4b1ab7d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised websites and potentially disposable hosting, suggesting an attempt to lure users to malicious content or phishing sites. The presence of 'cmd' in the document text, alongside embedded URLs, further supports the attack pattern of directing users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://huntic.ru/uplcv?utm_term=foxit+phantompdf+standard+crack+key PDF link annotation
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/aaf425662ac5d9899a260d8aec625394/kugadodunemizutevepexumi.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/48002055164.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/c34c0f36788c2a4f2dd8da6f706d45a0/87957193438.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160902ec4e96e8---bujigus.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/4cl9aovp9q4pjasa526gltdpt3/wopobazetozusepunav.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804bcace7e3---wodexave.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/5vd3gkcmd52ili4847ncdtmuuh/5627822239.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/23058432616.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/4261608047.pdfIn macro / runtime command snippet
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/fcug00m2mfk7vk81n8jj6m75bc/sozimexapididisuvidudar.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/af989adeb29ed9dd3a739b6b7405a678/fugaperarefoje.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b580cc4fc82---lujagino.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/wetoxosavugumidopuloso.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609290a3d6c51---kujubejidixaluloxafurozi.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/60637784697.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/12184728078.pdfIn PDF document text
    • http://bienbao.net/uploads/files/26978874550.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608616fd6804a---62090800072.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/buzowejes.pdfIn PDF document text
    • https://hiroyoung.com/data/files/salobivuwuwamutudinibefe.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/iocqjvep42q8qj78n2eruk3n8k/13424514220.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/88317785993.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081e0979a13e---72412111890.pdfIn PDF document text
    • http://www.nomorcantikjoIn macro / runtime command snippet
    • 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_off0000eb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB47 24952 bytes
SHA-256: 4e82f3a89f573e80d6db7d7e2d353d3c87a7fb5d8037bfea4358f27ace966003
font_01_sfnt_off00012afd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFD 11124 bytes
SHA-256: 36263dad67419a99332cfce0774ec484ed0e285198680c07f35f722eba2d07c2
font_02_sfnt_off000144d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144D5 16728 bytes
SHA-256: 5123d6ce310bc7bc9f11b0f055fe6bf6b807ffaac422b686dfef87e5cab856ae
font_03_sfnt_off00015cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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