Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c04089590fb38cb…

MALICIOUS

PDF

86.0 KB Created: 2021-09-15 09:04:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0a5cc0407a1e61bf7ea3faff4926ea67 SHA-1: 82c87acde871a76e528f74311e55926626b8d779 SHA-256: 5c04089590fb38cbfff63cfbc77b02e76138dc32f5cd0120cd66fffcfe1e7540
172 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. It contains embedded JavaScript and a link farm pointing to various external PDF files, some hosted on compromised CMS uploads. The presence of a 'download button' heuristic suggests a lure to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 8

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=street+racing+hack+apk PDF link annotation
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/34356102986.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/41090461176.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/87494477350.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/2407880308.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/fitel.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/jukofabotofatizuwuxona.pdfIn PDF document text
    • https://506hlapeta.com/files/file/55028708955.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1613173464f6a9---kipoxuzi.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/vabadodov.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/22742146667.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/lumikotugilisofigesaponi.pdfIn PDF document text
    • http://tinhdaurosa.com/Images_upload/files/15297970938.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/2739420089.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/421d04d7c1a09df23e58ada648488e4c/43823311289.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614117d7e1207---67740954314.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/fosisipituromikomalumunig.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412f80ec4ab---wanowa.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/xuter.pdfIn PDF document text
    • http://medica-brno.com/files/55539172309.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/losarexofalowotonovipafi.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd9fb0ca4b---ruwefugad.pdfIn PDF document text
    • https://elemonbg.com/Files/File/gafijevazo.pdfIn PDF document text
    • 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_off0000e3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CA 20840 bytes
SHA-256: 6293f9fa70b5ee394404ab29ac178aad286c04d30add46d536e65655b7456fa2
font_01_sfnt_off00011a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A94 10488 bytes
SHA-256: f825cee15405ad39f41f456103940a986ca4c13f79513e438ae681c30088f285
font_02_sfnt_off0001325e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1325E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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