Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb4304c8a32b2f78…

MALICIOUS

PDF

108.8 KB Created: 2021-09-01 01:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b24893aeebb43ecacb1de9233464eee5 SHA-1: 9ac921695409efe7b099611a96688c0db48cc997 SHA-256: eb4304c8a32b2f78b87e3f5512497a5afc3ed2a519bdb264af9fb44de9b3380d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to websites that appear to be compromised or used for hosting malicious content, indicated by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The presence of embedded URLs suggests an attempt to redirect the user to these potentially harmful sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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.
  • 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://bbpcosmetics.com/admin/upFiles/2021-7/file/wisakigigin.pdf In PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/pkt892khhoogqjvdv75fnabohp/kijagaro.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/62316374838.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/tixani.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/18883104950.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/96507629db0c8fc22ca84cdced2024cf/bixadiwerox.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image//files/31388531300.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/73e1b7b405220012f8e870e7916e221c/kaxon.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/1640130c42131ecfa8fcda247564a603/77313986722.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/46263430152.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608353b26af91---8556074500.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160fd26fb882c3---kavow.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/71fcca74b572d10cba30eadcf68db5aa/44114034848.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/minakanupar.pdfIn PDF document text
    • https://svltv.in/userfiles/files/nasuk.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/22204172652.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/36987743684.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/55843317077.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/tkhbh959osbokjs4lvmoamh8dr/87909275526.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d70de656bd---31064578684.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/08/files/210819191630.pdfIn PDF document text
    • http://www.uniformsolutionsforyou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d84a5bb1ff---ruwajif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=passage+for+reading+in+englishPDF 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_off000142db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142DB 10536 bytes
SHA-256: 3e6c8e412d211a5ce50c3df0e285e0fddd63a9fa61cfbf6445b06fc9648dd1bc
font_01_sfnt_off00015a7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17291 19364 bytes
SHA-256: 400635b55a83eae3cf7fdd415f89ec6a057a3026aa2441414850809aead30566

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