Malicious PDF — malware analysis report

Static analysis result for SHA-256 c464e3e90dc7ac76…

MALICIOUS

PDF

109.6 KB Created: 2021-07-17 18:12:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 348b58236532920b76e86573f1864448 SHA-1: bcedf8fe6359f5beb194e67b7b73edc73d8e94f1 SHA-256: c464e3e90dc7ac76e5bb894b61f82d545afc58069aef2132540602b79ed7101c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites, 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. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9882

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://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/9737ab73c0e4dd46c52f0e6dc3892b6a/xususefavirizalagudag.pdf In PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/87075224269.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608427f23e601---64806342781.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/97993534183.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/db8c2331c54d14463135e5ad2896f6ad/83265076724.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942b9262a34---62879918881.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef1d42b40e---94358657107.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1ee068083---funifowive.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/68499254878.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/regufetulonagap.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/9186056085.pdfIn PDF document text
    • https://kajariaadsevents.com/admin/uploads/file/busivulevulajuvijuxoz.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d48dcce3228---22456942238.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/d9aaf7eaa3806bb7c0f6136f1ab714e6/22587028084.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/abg3g9bnc1d4g9l2em500d6251/ruzemud.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d86adedad26---32198583296.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/vekafano.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/1c6bbdb3ee5ff0f0961ed63ecd410b25/89208528101.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/26366876325.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/63541836657.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/231915029212.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/gizitasutizoz.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f28fe4e5f0---pinininizegafezexik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=a+ceremony+of+marriage+kenneth+copeland+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001324a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1324A 11088 bytes
SHA-256: e4406ee9a14e6b4ec561c4d6014a8c83629f1e3b20fbea760781f50d63f87fe7
font_01_sfnt_off00014bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BBF 16180 bytes
SHA-256: d64c8c6eec96a691c8f0017435fc3016a891cc1e3bbe78ff85d6c2ae04d6907c
font_02_sfnt_off0001615c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1615C 17816 bytes
SHA-256: 409d17e7f76cca768f910c8b6605e16a74c2190c1792e17a99b98fc78d185cbe
font_03_sfnt_off00019039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19039 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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