Malicious PDF — malware analysis report

Static analysis result for SHA-256 815b0e2437b8f1a2…

MALICIOUS

PDF

87.2 KB Created: 2021-06-29 11:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a5bccd1bbc8762be8cd8f1deabbc4ee9 SHA-1: 720b639127e4c3bbffd698fc14061ce285188f36 SHA-256: 815b0e2437b8f1a22fd16e1b088c4335e19f8c96fd8b13c7e3ff66b0912e79bf
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS upload storage or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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
  • 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://baoholaodong24.com/userfiles/file/ximasi.pdf
    • http://cafegreenwichvillage.com/uploads/files/58796343996.pdf
    • http://planbmedia.hufiles/jozixovaxozaxedekipogisa.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c084950ef7---9770640097.pdf
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/56284395571.pdf
    • https://beauti-full.ru/uploads/files/dodaluwiwavir.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080237e86e51---12237884205.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/cd4754a9262101f538ff7556b08173db/84024021022.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609758c388955---15248483068.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/57d41af239e864e5d8ba232c5255b39e/46402595711.pdf
    • https://apsco.ly/userfiles/files/janasuloluvoraxagololan.pdf
    • http://gayaarchi.com/userfiles/file/20210623105642.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608a422f078c2---jawesej.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607089c5c193a---mexuxidizaguzu.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/buwutaz.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/sixolanogog.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/24c7fc5b4dfd669f26125e8bbd0a08e6/50908482906.pdf
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/iufrkobppepvs5bs9meu4dm5od/22517543908.pdf
    • http://kapsalonindex.nl/images/uploads/20130144417.pdf
    • https://psychologgia.pl/Upload/file/dusosixiw.pdf
    • http://mayinluatudong.com/uploads/userfiles/file/29493249335.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=what+do+i+do+if+i+answered+a+question+wrong+on+unemployment
    • https://mediaget.com/userfiles/files/8068671380.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb0f.bin
d729cc92577d91007a69901139c63556bcbd068944f39b67969934d7cfcca2d9
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0F 11384 bytes
font_01_sfnt_off0001053d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1053D 16792 bytes
font_02_sfnt_off00011d4f.bin
67dc4fe8ea7ccf61e637f60e89c719e0ddaf125e59fe2042bd8417d53e7c66a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4F 18168 bytes