Malicious PDF — malware analysis report

Static analysis result for SHA-256 09729dfe2fefdb7d…

MALICIOUS

PDF

87.8 KB Created: 2021-07-27 03:14:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 85ca84801adc11fa3711f577b8e36db0 SHA-1: 15c7eade8784c07328d729b35d7d0b28fc63cfab SHA-256: 09729dfe2fefdb7dbd59bf09e9200349ae22a714d3460dbca0131b1f04bb0973
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it's intended to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ql9pp6j0mut73grmkh21rku6u4/51454937445.pdf In PDF document text
    • https://vibanghanoi.com/uploads/files/fedoguxebedi.pdfIn PDF document text
    • https://parfumzone.ro/files/file/33537854875.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85231477981.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/56598183390.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/fexusupobobam.pdfIn PDF document text
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/3bfb0b842c0f55454eff5c4117013faa/vevubeb.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/db1d0e8844bcca5bea7c677e250666c2/12366727679.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c47351b7f60---97186691129.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/e2263696541e7ec8f7fe97108d16f21d/buwejeloxisozuf.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/famizugokuda.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bcccb2d1706---rutusosiritunetavusenin.pdfIn PDF document text
    • http://nnrhc.com/clients/9/98/980d61ede38c9a35fe3396fb65651545/File/49390403016.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///80285615693.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/iv8rq2nbcmpokr0bcrp706ojt3/15055787786.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/vsfitaqejnfcapk3cvmt19c6rj/kiweboteb.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/od7g5qiunnsvldrj945cbbb416/robuxogatawegakepi.pdfIn PDF document text
    • http://arslanemlak.come/file/12557463856.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/da8f6b30b4a2f7e9a39ebb6df757a86e/71660487857.pdfIn PDF document text
    • http://deauville.ru/files/file/71029969013.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/daxonuwe.pdfIn PDF document text
    • http://lakesideterracecondo.com/clients/41361/File/xatisib.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/polanamegumazowunoseb.pdfIn PDF document text
    • http://www.heksan.com.pl/file/salavovazap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+program+a+universal+remote+to+a+proscan+tvPDF 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_off0000f088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF088 10960 bytes
SHA-256: 188d38b341c91360b84b5e12da7139f0d99bd4b92eb6180cffa692ef1e60e977
font_01_sfnt_off000109ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FF 17548 bytes
SHA-256: 52dc3cf2a0970293f5fdfc3eeee6a496a81057b1295c5bc933ef3a1debb209f0
font_02_sfnt_off000137bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1