Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cfc831028b8b6ec…

MALICIOUS

PDF

76.4 KB Created: 2021-09-07 11:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3b8b7bc7357b60ed1d5fd62ccb687f2d SHA-1: d89f46a40e5360d79bac1b2fc9d0b77dec168aee SHA-256: 6cfc831028b8b6ecafa4932d80f2a4d3ce53203d64dd4ef7cb456c92d5e382f3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution campaign. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ba1baba42---42577796225.pdf In PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/gbmepvape9ddmr7tpqckb9dp4c/menudezenusedasi.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/jevedasip.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/pavamoxuwiwojunulixewa.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/478877ebabbef4ad310b665288c8c74d/metitanetotejifemezof.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/wefazutapezepanewojilew.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/pojavufawelex.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c965bd79d75---17581668560.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/gomabopugijapimapugu.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ab209cd532f---refemizanetuv.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/443605ec30edc816d2765bb2a5871da6/tanonasuxugikowago.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/budilesapegamiwe.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/kasijopule.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/95930466658.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/27673260713.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608042c8d6cdd---gijisonigibib.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/nujuxupelavaluselakureze.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/89794622483.pdfIn PDF document text
    • https://predial-rua-nova.pt/056-CovadaLua/images-editor/file/xozokemowuruzakevotupad.pdfIn PDF document text
    • http://voijin.com/userfiles/files/9024654928.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c35304534e---reditapu.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/jozesepurosupupenek.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/e00c73f4202b6d11e5ea7ba66e4b9a0d/gezun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=cefalea+post+anestesia+raquidea+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_off0000c30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC30F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB21 18292 bytes
SHA-256: e1bac12561a3f0b4525f9b76c40e338393f42fe9443b75575076d88b4c7933ed
font_02_sfnt_off00010b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0D 10768 bytes
SHA-256: e3af4523728078fa5c7833dc829b9b7c2496baf31d4c8bb8b8965cbcbdfc4d27