Malicious PDF — malware analysis report

Static analysis result for SHA-256 bde32dccb29a7c27…

MALICIOUS

PDF

93.2 KB Created: 2021-09-07 21:35:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 84fb91e5e6d0da5b5a016e7bec74aae3 SHA-1: 842bfc6bc4f86fe5536ab4c75d205ae627232b08 SHA-256: bde32dccb29a7c27cbf843a2ef3423fded367fe3341081d110bba8b7ca0c65a9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and a high number of external links, many pointing to potentially compromised or disposable hosting, strongly indicates malicious intent. The ClamAV detection and ML classifier further support this, flagging the file as a phishing or trojan PDF. The embedded JavaScript likely serves to execute malicious code or redirect the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 http://worthingtonpark101.com/userimages/kufetu.pdf In PDF document text
    • http://coyada.com/up_images/up_images/favekivetijoranazijoz.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/1001982527.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/vesovemowuloxes.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/tamotevokigaxamos.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8aa10fd91---kuvusejimipotote.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d76007c9a7d---wodanamudinonokata.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/46580691997.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/45674733894.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/43718226809.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/kovodajewibumibi.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/e7bc989d78e32f797b00bbf01472812e/60123863704.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/76380748828.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/55103816065.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/mesupepasusokuxumorixo.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/20216111733533072.pdfIn PDF document text
    • https://tusenfotingen.nu/anvandarbilder/108/files/vakip.pdfIn PDF document text
    • http://allasclub.com/campannas/file/kigabadunenil.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/maxaxokigu.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/rulorazanumajidilaler.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a00e80565e---rogopokipaveweve.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a04a6071e3---81621758731.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c982577ebd5---legozobadevejemerudazuzu.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/1860c03bc9d59ca1c23f3d9ea42ec95c/79754045652.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/71249521871.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a761109ea---satibogaka.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a0ed87127---poxuzezedopilonoman.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=la+vente+du+fonds+de+commerce+au+maroc+pdfPDF 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_off0000fd91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD91 22136 bytes
SHA-256: 29b9eac455edbb108baefa1b06630217b694b0a2e1d906dbf8810fc372137cfd
font_01_sfnt_off000135e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E3 10764 bytes
SHA-256: 3403a0e5a7db236c01ab834552438f38a61c434c871e7aedbb33f3aea09b0158
font_02_sfnt_off00014eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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