Malicious PDF — malware analysis report

Static analysis result for SHA-256 92128b5112bbf4af…

MALICIOUS

PDF

103.5 KB Created: 2021-07-27 16:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8194a50a89d56afa4d05471bb4b1972f SHA-1: cd66ca4926d097ae3ac8edb9c017cfbd665363f3 SHA-256: 92128b5112bbf4afb13e5bb31ce0cf7de53260459e5b57c1d98aa9e093da30cb
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm designed to distribute malicious content. ClamAV detection and ML classification strongly suggest malicious intent. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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 https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c336af1f07c---xusepajaxovade.pdf In PDF document text
    • https://ptogel2.com/contents//files/pudadufuwemibelixesado.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a95faf1efd5---96570483246.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd993d076c5---napume.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/971386702.pdfIn PDF document text
    • https://arerp.kr/data/file///xapapimidijaroma.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/7210825813.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/ridat.pdfIn PDF document text
    • https://brakos.it/file/2572168760.pdfIn PDF document text
    • http://modern-pro.ru/files/file/84358897158.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca678da837---sadumetibigutimud.pdfIn PDF document text
    • http://changecn.net/ckupload/files/44416678151.pdfIn PDF document text
    • https://tanthuantelecom.com/upload/fck/file/kotexanapas.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/c496239ba9f015d6bf58dbfcdad43013/jipejudal.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/srmtgstcgnncf3o4152mctr54i/jurorojapevamu.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c335179be61---37729090857.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608021847e8b7---majodofu.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/wotinesuboriwukine.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/roribitafobedovopopikisad.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/she7fohkui2bctcm0rotqupap4/14094040033.pdfIn PDF document text
    • http://divorcefinance.nl/uploads//file/84340100996.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/78cecf6e283a6038693b72ad0cc420e4/62749803538.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/42659672971.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/kk2o6s28th8rk4c3jtk5cu9idl/45991652670.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b787d51cce---xebakovorasafepejoze.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/2efc4d77b3e87bcc1d4c866a8bc8a36d/kekaxejojitole.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=netflix+executive+summary+2018PDF 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_off00012eb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000146ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146CA 18096 bytes
SHA-256: 37c7ad6d0718a516516cb4c2925d9b0506d7441f37fff9c5ccdacda59a5ccebd
font_02_sfnt_off000175e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175E0 11132 bytes
SHA-256: d67e8d1f96b36613fa964e413ccf3ef6fd8581fab57af214d482a0d4680fd862