Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b986f395d35cd86…

MALICIOUS

PDF

94.2 KB Created: 2021-09-17 20:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 86138212b910112c4fea51db17d2e89e SHA-1: 593407624a368434ec728e89435870fce7990d01 SHA-256: 9b986f395d35cd8673b47718a04aa5d06ba6dcc8b879dbaf81b52ed8da256d24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The presence of external URI heuristics and the overall structure suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9523

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://inwebjor.ru/uplcv?utm_term=nba+2k17+android PDF link annotation
    • https://phm.vn/upload/files/68933103802.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1614118dc96a60---kajejamitapom.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e568f64375---vifejilijitevapuzoloxa.pdfIn PDF document text
    • http://safarang.com/basefile/files/fomat.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/22223096938.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/vumazodag.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/monatikit.pdfIn PDF document text
    • http://01host.ru/userfiles/files/dudegawu.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/bekivulopokozivu.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613704c055791---30274746283.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/26754063121.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/xatidesi.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/62998382631.pdfIn PDF document text
    • https://oriontradecom.com/ckfinder/userfiles/files/tokudadezezox.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/161345c8cc8a6a---60667969548.pdfIn PDF document text
    • http://benetalent.com/upload/files/lumusukufazokixolixejaxok.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bepoxeduxupovarog.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/17345686314.pdfIn PDF document text
    • https://888nv.ru/userfiles/file/65205887183.pdfIn PDF document text
    • http://it-hair.com/userfiles/rewopudu.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/rulakonosu.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/defoves.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16136b3ba0e101---13217542233.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/jekajodimanavadudidul.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/kolupef.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/jegemuxumaxosawewopinewu.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/xuvidikutu.pdfIn PDF document text
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04B 16308 bytes
SHA-256: b967c54a3f835d7da325b0c549302fcc6f77585e1b73a9299969cda88e875c3d
font_02_sfnt_off00010686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10686 26908 bytes
SHA-256: fc4dbaa611e88f96fccecfe257e32feae4293f262fdac957d33e1f67b6578f94
font_03_sfnt_off00014b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B4C 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_04_sfnt_off00015349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15349 10228 bytes
SHA-256: cc4b6624d3350fd2cb11046f927d2e159b46339672c1566600190852a28851ab

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