Malicious PDF — malware analysis report

Static analysis result for SHA-256 373a4f45b1360882…

MALICIOUS

PDF

79.6 KB Created: 2021-09-13 19:11:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9ab2302679fe057166c2ea1dc9b0f341 SHA-1: 2fd1a08863d42dbbaf81c846d23daf964508451d SHA-256: 373a4f45b13608827180ed6a0b24e47e9c36b39a7717682e8f7a2fdb9eefed3a
154 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics identified the PDF as a link farm pointing to compromised or disposable hosting, suggesting it's used to distribute further malicious content or phish users. The presence of numerous unknown URLs reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5648

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://hocomesun.com/upload/36036642287.pdf In PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/79117813257.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/28560720764.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/2962866797.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/p42nig5ld0jh1kahqv05r4t8a3/25598147717.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/zomeni.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109020014247726.pdfIn PDF document text
    • https://predial-rua-nova.pt/056-CovadaLua/images-editor/file/xozokemowuruzakevotupad.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/64915686747.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/21901584094.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/54c89a12c906c1b6a04df0adf76b1ab1/bejusijibepoxumin.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/18908053048.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/88385502404.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/patapolefijutajatew.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/botukax.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/4735339878.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf09289aa1---28489295910.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/maranepabezukogu.pdfIn PDF document text
    • http://premiercontainerlines.com/media/ftp/file/49011278635.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/xusizabagivevilesirexoka.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/60827791689.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210908_193119.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210906184552.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=react+native+backendPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10526 10272 bytes
SHA-256: 9fc39a2d7b931e1927653e05a3679ad67b4b298f841780f510f9ef9289e4e7bb

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