Malicious PDF — malware analysis report

Static analysis result for SHA-256 89f1a57341571938…

MALICIOUS

PDF

90.4 KB Created: 2021-09-04 20:20:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: be199bdd4b8b47085bee58626687629e SHA-1: a1abfb2af57faa5d797f83a25cc6ca395cef1b16 SHA-256: 89f1a57341571938fcda1745774859426bb10c17b4a3ffbf02b77016bb105f04
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. The presence of numerous links to external websites, many hosted on compromised or disposable domains, strongly suggests a phishing or malware distribution campaign. The ClamAV detection and ML classifier further confirm its malicious nature, likely involving exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://myredm.ru/uploads/file/zozurenoxowuzuk.pdf In PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082a8652eee1---jufur.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/69927473208.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/bufojivofoxevutekalij.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/45926610357.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/90373844953.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161004cd63bd6f---zufabezopuvovapa.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/79a6fab0b7cc6973e92fcb43a27348d6/damox.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/87152944322.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160730972c2340---88453263679.pdfIn PDF document text
    • https://abeess.com/userfiles/file/168698081.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/0877fb97c16370ef69cebfd78be9b334/tomopugovoloxulegov.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/tugekisovavejovadarudu.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/82420553546.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1610469e31acd1---1866087275.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/29214716087.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/jenajaganezapip.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/9ov5j7eu4lvd6dped8uqvb4fs0/97343636904.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1b808e0ad---degopagonofesin.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb48849106---jadanenopivapu.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/xilixuginavezov.pdfIn PDF document text
    • https://haidangpc.com/contents/files/66634854453.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/fenurowadoramili.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/91786904456.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/86213539024.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=radio+wave+propagation+book+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_off0000fab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB5 18580 bytes
SHA-256: a5cecbf3cffc84bc13845820de993dd606ac901a7740be5b5a7590c01489f2fa
font_01_sfnt_off00012a98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A98 10888 bytes
SHA-256: 0bf4e8344de05d1f7c90a705a7b890909beebd293c3446625a9afc26b55f1ba3
font_02_sfnt_off00014384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14384 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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