Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c5a9572dba5fe2…

MALICIOUS

PDF

79.7 KB Created: 2021-09-10 14:13:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 938ac5e5b6e25e08d41cdf570e7a18c5 SHA-1: 448bbc547b687e799f0db9ee266f5a88cb1d55bb SHA-256: f1c5a9572dba5fe2ded8326d6018999c6eebcf14f2a3ddde7d792dd1618c99db
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bilcafe.it/userfiles/file/tadulodebasibirezogedaxek.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380851e1953---55438938910.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/xamexulowori.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/zixono.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/cff323a40b5c935f5a7b87cb508a3f60/rokenirofurajopawu.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/bagijisijovavogelogo.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/54463498629.pdfIn PDF document text
    • http://baove247.org/upload/files/43551641520.pdfIn PDF document text
    • https://lasanisports.com/files/sifodujazizexitok.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/zobitogabafaketibuvodo.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303a5d9fda4---mubitonoxag.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae6bb8a6ec---ruwanefozafetizatovozane.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/15842981338.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/gasozuzedafitatane.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161331bdecbab8---77211592236.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a638ce1bb.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/72081951163.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/vokajiwolag.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/jojosurelidesegu.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/14427152689.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/besiwuzufegujikizanimeve.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/48282926814.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/44875650660.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/3729426375.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/92430298658.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=vidmate+old+originalPDF 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_off0000d4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBB 17716 bytes
SHA-256: c2a2e7499e7b65d52339b9498d8b80a854036de65206d4031fb3010366762bde
font_02_sfnt_off00011a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A67 10392 bytes
SHA-256: c66c25f31789f2b2f4b9eb37dd414851655638235f77d0652de6b791c940ff92