Malicious PDF — malware analysis report

Static analysis result for SHA-256 84855931e306563a…

MALICIOUS

PDF

82.0 KB Created: 2021-09-17 23:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7df1f042de8cb409aabb4df10db3f916 SHA-1: 8e47bf9bd84614ce7351c1c77366a5967670cda5 SHA-256: 84855931e306563a941628864c0794792a9ad457bd5a0483958f286879adc484
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external URLs, many hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pixomot.ru/uplcv?utm_term=%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8C+%D0%B2%D0%B0%D1%82%D1%81%D0%B0%D0%BF+%D0%B4%D0%BB%D1%8F+%D0%B0%D0%BD%D0%B4%D1%80%D0%BE%D0%B8%D0%B4%D0%B0+%D0%B1%D0%B5%D1%81%D0%BF%D0%BB%D0%B0%D1%82%D0%BD%D0%BE PDF link annotation
    • http://kronikarp.pl/ckfinder/userfiles/files/87620837484.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/fedesowarefopunepolituk.pdfIn PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/dexulamu.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/rokanewexikojowugamosasu.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///20724463959.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/22432604356.pdfIn PDF document text
    • https://temahr.hr/files/14872616414.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/tomogosikugofidera.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/wamakavubiduvekuvakoj.pdfIn PDF document text
    • http://erex.hu/upload/file/nivuzuxirizut.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/47004521479.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/dopebefux.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/b7035a7a377754dd12ccb52df8941cb9/fuzuwajokefaforor.pdfIn PDF document text
    • https://computerzone.pk/file/popasapusuxoxijegis.pdfIn PDF document text
    • http://goref.ru/files/file/simuguk.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2dbfe6662---487520203.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/91331866449.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142ecca25a9e---dezasegageguwibo.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/tewerojepanixegopepate.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/dagonujedokuraraxeso.pdfIn PDF document text
    • http://fitviewer.de/files/file/tupuvibipozedisatogavig.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-07-00-56-09-66.pdfIn PDF document text
    • https://e-motorcycle.tw/upload/emotorcycle/files/2107491586.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB70D 22804 bytes
SHA-256: e95ca3d72e34de8e22d7b8bdd96109f36b4c044acaa30ac7253838fcf90e162c
font_01_sfnt_off0000ef9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9D 16132 bytes
SHA-256: 071bac7a3a90310621307d68123817e30fba7c89f9e5021c4391eb43bd8b9137
font_02_sfnt_off00010514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10514 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2B 11060 bytes
SHA-256: b763b66f6e18729b0efc45494594f166c9e0a3f50294bb4d9d0f9b9bc81d5177

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