Malicious PDF — malware analysis report

Static analysis result for SHA-256 e87ad2ba9ee07f92…

MALICIOUS

PDF

81.2 KB Created: 2021-09-06 01:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: eecf588cdeb3a960e59abd243d2a2176 SHA-1: 505f8caaf9e043f1b5c08e49a64ed16f0b6f837b SHA-256: e87ad2ba9ee07f92b04a48968da1e162f1f6645372a5c024e2c67233dfa1d493
204 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a LOLBin command-execution lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://eatatrudy.com/uploads/files/41713909044.pdf In PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/af7476d7ceca3389be8b1d3e61232437/67543695070.pdfIn PDF document text
    • https://dannysacademy.com/ckfinder/userfiles/files/89148937934.pdfIn PDF document text
    • http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/26873132636.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/37c5b1062fa6097976d7234756a9d722/tutomazubijutofapevanu.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/e35529c0474737a280b845e356aaa914/mifoxufomolisitisazevete.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/rafodujuzozotepabi.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/75072671806.pdfIn PDF document text
    • http://efrex.cz/files/file/dewaxonopivojijuwajasofu.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/o7sv5mkvucd5h14ef40v1m967v/50605753879.pdfIn PDF document text
    • http://jx4d.com/userfiles/file/63143986728.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/8562664fdcb20eb61874354bcdc6e59f/mireminasezudizazetukuk.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/nubalisibatufomij.pdfIn PDF document text
    • https://menu2uplus.com/images/file/83422914229.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c426047d1e4---55427885235.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/10657029950.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210816153101.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16079fa65d2bb1---84791411586.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/a29a029b66c339eb3411fea7dcc3e08c/nipamobamogoviwumotisur.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/6de8fb845e5c8427999f723d172963af/97945683327.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/bulevobexatabod.pdfIn PDF document text
    • http://qdcmd.com/data/files/30463320938.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16128d7c97a1f5---5376635300.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/xegixaf.pdfIn macro / runtime command snippet
    • https://tramhuonghanoi.vn/upload/files/dezokogejefovelejatinonip.pdfIn PDF document text
    • http://pericosrentcar.comIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=transversal+angles+worksheetsPDF 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_off0000d815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD815 10504 bytes
SHA-256: 3df0640897939b3c0d16b4bb86296375aa4b30c0ab7bd6b5c1b153c99036bb30
font_01_sfnt_off0000f009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF009 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001081b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081B 18204 bytes
SHA-256: 28f65d3d8c4cbaf6e81faff760ee964e7ab5f59bd518d517f4b648d83646e9e3

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