Malicious PDF — malware analysis report

Static analysis result for SHA-256 478c91b635c0d992…

MALICIOUS

PDF

104.5 KB Created: 2021-10-14 10:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: dd0a44930e3b05c02462c9f68e639bc3 SHA-1: 6dba6a968e4555bf0af01f0e26ecae9125e8815f SHA-256: 478c91b635c0d9920cd0f50e10e06442ad3fb0ff676c321819af5d47a56c7c8e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://sin-wa.tw/app/webroot/userfiles/files/72245637112.pdf In PDF document text
    • http://lesmashclub.com/imgUpload/files/kavubutujevafomu.pdfIn PDF document text
    • http://xn--82ca1bkibi6eufn5bh1b7i3e.com/UserFiles/File/xigufubome.pdfIn PDF document text
    • https://rayvoltbike.tw/geektic/files/fenomurikajimefezubemu.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/vewefakowalupa.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/62647515963.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/xuriju.pdfIn PDF document text
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/12303218595.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/e50b02a93b18908a94c07ee71c79270e/38273174959.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20211001_B7034FB1C21ABE2A.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613562bd762a4---gedinoponuxiropi.pdfIn PDF document text
    • https://777mto.net/contents/files/64021159925.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/35292189818.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/14042206219.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16159e5ee86411---fozomitolojato.pdfIn PDF document text
    • http://malerbetrieb-malanders.de/Webseite/pics/fotos/1/file/17204006293.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/f18b55ad4b4ebdb4b703c225ddb232bc/pedotanuxi.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/vikesumumorenoku.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/nizebuzuzolebilabeta.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136e22733841---xevututulewufoxuvedu.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/53401801809.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef01ba686f---83969521925.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/fejipemi.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/nerexamanusuvezowuwe.pdfIn PDF document text
    • http://akademibt.com/resimler/files/64497839681.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/25915613901.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/HKUGBsJGI0E/uplcv?utm_term=medication+for+idiopathic+hypersomniaPDF 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_off00012ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE7 20464 bytes
SHA-256: 9308f8b46770d652cecca389b2bc320dcbad7bf6855525afe7d079ea51b8b828
font_01_sfnt_off000162b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017acc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17ACC 10948 bytes
SHA-256: b9ea2f8f3a3a8bee5043b1c0d76867cc0951730ee3bfb4d05f33df0115ffa087

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