Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bcda5783edb085f…

MALICIOUS

PDF

68.2 KB Created: 2021-09-21 00:19:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 4d1443c3f8e04060ad98283df2efb7a1 SHA-1: 878fd8c652f573dca21e696efcbb814aff2102cc SHA-256: 4bcda5783edb085f79611f039009c7292a5c3c6979883b6070db19601c2a29a8
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • 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 https://inwebjor.ru/uplcv?utm_term=fut+20+pacybits+mod+apk PDF link annotation
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148fa3ca488f---xanade.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/zefagop.pdfIn PDF document text
    • https://il-gusto.com/images/file/salidinewixuxomuku.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/3728753067.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/serezizevux.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/8147368616.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/kipufimupal.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/63820316911.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/66665643552.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/83890476293f75ccfb8d9933623009d4/jimexabobanoxuwor.pdfIn PDF document text
    • http://esangsok.com/upfile/files/64809443079.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/lagidedoveketaremolupa.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/54382383149.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210911084513.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/31706007931.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/6171365818.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/sorilunelajudodeze.pdfIn PDF document text
    • https://fundoohairstyles.com/hairstyler/images/file/ravezixalolabupepunu.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/75095901039.pdfIn PDF document text
    • http://yingtailong.com/upload/file/210914012839820764kzd58sozlclp.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/vepegusenoxala.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/5e7a402bb9f1bfd760b3799a7fa37232/68449982632.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_off0000ac8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC8C 15304 bytes
SHA-256: 781409a238c85bd7d448b26693fd933cbcb32f7ffe97d3e662ff3d74692c521c
font_01_sfnt_off0000d260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD260 10960 bytes
SHA-256: 61a522104e9d8426977d7a7f977fc7f9136a85c446a9aca0ec776a3d108bafa8
font_02_sfnt_off0000ebb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1