Malicious PDF — malware analysis report

Static analysis result for SHA-256 a963eaa5f1e863b0…

MALICIOUS

PDF

80.7 KB Created: 2021-09-20 11:26:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 757a952b01b818c0fedf7f7573c86b33 SHA-1: 23185bc9ef549536ee2caec8bd1aa305bd29861d SHA-256: a963eaa5f1e863b0c24095e8f2c57d083d7cf0e7d7835a0c08ff0dfc09f5a59d
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links to external websites, many of which are hosted on potentially disposable domains or compromised CMS uploads, suggesting a link farm designed to redirect users. The presence of 'cmd prompt' in a URL and the 'SE_LOLBIN_RUN_COMMAND' heuristic further suggest an attempt to execute commands or exploit system utilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://nikolalepojevic5.com/multimedia/file/sugagijopumufi.pdf In macro / runtime command snippet
    • http://kovovyroba-nosniky.cz/UserFiles/File/butobuperilowaviwibijite.pdfIn macro / runtime command snippet
    • http://tylincms.com/userfiles/files/37790928571.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/pafobuwiludibamote.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/dajujap.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161408b4f31ba9---8008687755.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/19378942396.pdfIn PDF document text
    • https://ivanamihic.com/files/kasuzaleruxudisom.pdfIn PDF document text
    • http://maihome.hu/admin1/file/1203016976.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/8a591f04d73605e8e044e4553fcd0f85/pafowilobejuxodajutu.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/38699391126.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614779575fd3a---76231241544.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/dalurelezevupida.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/kadonukakudimubagelupun.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/31442620630.pdfIn PDF document text
    • http://st03.it/userfiles/files/xobowedotuxowepula.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/mifokoredolesexoz.pdfIn PDF document text
    • http://homeopathyhk.com/files/1217975845.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d479836263---bozobulawomikazul.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/lofebapel.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139062d53bbf---kujogub.pdfIn PDF document text
    • http://cserepakcio.hu/xdata/file/51232026801.pdfIn PDF document text
    • http://domplus.su/userfiles/files/sodajiragen.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/wemogivudiw.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021091603502773499.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/nagafebi.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/jemizuwosugiputo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=android+cmd+promptPDF 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_off0000d644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD644 10148 bytes
SHA-256: 105a06734ebcee00d04df6e77ce286472ce9cbc479d684fe46be0c4acba6fd7c
font_01_sfnt_off0000ecdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F1 18340 bytes
SHA-256: a6bfe7179273350a963daa323d5b27dd21d98a38dcf46a0c5a9e4e4cee15b16f

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