Malicious PDF — malware analysis report

Static analysis result for SHA-256 63c36cb602c66fff…

MALICIOUS

PDF

79.3 KB Created: 2021-09-14 02:04:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f33557f9f5c084063ac7fcecea4944fc SHA-1: 35ca357ff7cebefbf1caf266040ac911d8f41f88 SHA-256: 63c36cb602c66fff11ade2be91f6062e834243f1206e3cc079c2290c528058d1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to host and distribute second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.armstrongre.com/files/files/40274070315.pdf In PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/fedisatel.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16139f08b7570b---14372961632.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a69e3bfe4---80946539492.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210910052655.pdfIn PDF document text
    • http://morakothotel.com/file_media/file_image/file/40166338476.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/41162910331.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/91404852132.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210913_574530AB7319B1A4.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/mevebake.pdfIn PDF document text
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/92651507020.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/rivaranaxinufusukukoju.pdfIn PDF document text
    • https://rippa.pt/files/file/33271534023.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/53739257540.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395c272d351---fatarodosejutaxes.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/gipapugirenejumaxafomasad.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/89012200700.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/28816743763.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/14728002690.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/gibosode.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/24461319494.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109030404584691.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/ditakasumilixexir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=asphalt+urban+gt+2+free+download+for+pcPDF link annotation
    • https://mediaget.com/userfiles/files/6806059752.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC0 11232 bytes
SHA-256: a3d061b69e0fdee9e32fcc6168e5a7bd83f603114195b086e1bf909fd2a1bfca
font_01_sfnt_off0000e6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D2 17968 bytes
SHA-256: d98b07622a8d4b6c4abf193a1d6148d5295400126c13e5f66a44d4874dee2df3
font_02_sfnt_off000115a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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