Malicious PDF — malware analysis report

Static analysis result for SHA-256 18f38487f476f8c1…

MALICIOUS

PDF

86.1 KB Created: 2021-09-17 17:28:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9daa66475ff101cdbc1eb3c51389c60d SHA-1: 1e56a47d866cbe53b803ba9b78d387a9fcdf317a SHA-256: 18f38487f476f8c1ec55fb26576a451fef9fcdb5dd7c21d5c9ae8b4d2be63119
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of a link farm on compromised CMS uploads and disposable hosting reinforces the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://hyundaiokla.com/uploads/files/deginaporop.pdf In PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/xurisotajun.pdfIn PDF document text
    • https://sayurhijau.com/contents/files/56926981935.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/21242733849.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/qdtda69bpsgtlrv9j06svet2ia/vekinifox.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/35990601921.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/nuvabu.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/88399566265.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/50602628291.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/23767910729.pdfIn PDF document text
    • http://carbontuning.ru/file/74879541119.pdfIn PDF document text
    • http://cke.hk/userfiles/letesorirom.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161363cbfa8511---61013705887.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/qeh341rgpo3gjpe3dmsu97q3e0/jiribawowazuwu.pdfIn PDF document text
    • http://goldmustang.ru/files/files/27578466323.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/darosibawuzadojadujuvivi.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6dabac036---wekikofa.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/divabemetowo.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/reviweketonijo.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b25ff16f57---vakugilaxipufadexedife.pdfIn PDF document text
    • https://datajournonepal.org/files/kemikilarezatoluvaliwe.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/1304952406.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/tugofejojutezo.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/3851964080.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+sign+out+of+outlook+on+android+phonePDF 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_off0000ea89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA89 17620 bytes
SHA-256: 75c41a47ed32551c74d7780c35e02c319d26029d202ce91727e29cbf1a09c66b
font_01_sfnt_off000118a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B8 11048 bytes
SHA-256: 0c82538f1239e41ee47a78985cf11fc5a3aba55ffa7f4bf1cd6a843f59c520d5

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