Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eb61ac9553beace…

MALICIOUS

PDF

76.8 KB Created: 2021-10-04 16:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 00269584b3dcf4d120f9fa14c32a85a3 SHA-1: 13972be21ec4f55a0a5a089742bb285f9776cf48 SHA-256: 4eb61ac9553beace18a89a0d437f255be4ac127c33317498a123e00c31412833
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://cgmorenanews.com.br/ckfinder/userfiles/files/28371843571.pdf In PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/vuxuratabexo.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc6aff2f0a---7575977149.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614b9897abae9---62759030381.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16145d87b96dfb---69404676412.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec994a1942---bitipedaxupowimosuvivub.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109100400235627.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/23798571447.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161500c324aad4---57077341120.pdfIn PDF document text
    • http://torby.kbo.pl/ckfinder/userfiles/files/50658008896.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/nogigofivojobupewag.pdfIn PDF document text
    • http://getvisa.ru/images/File/zeraxib.pdfIn PDF document text
    • http://france-ex.com/images/blog/file/25061477965.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/11631912581.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/50724976745.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/94936171057.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/28916835641.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/28374264040.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/64164311786.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/9065177159.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/lotiwu.pdfIn PDF document text
    • http://bndweb.nl/upload/files/23233367422.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20211003232335_304065587.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=funny+beer+belly+picsPDF 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_off0000ca3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3B 17376 bytes
SHA-256: fc11e5144aa7bf0c612c5e33a59744997390701f8d6cde7ba08ff132a8b5f0bd
font_01_sfnt_off0000f6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DA 10320 bytes
SHA-256: bc098ace09cefe0f2fb2227662a59cfbaccb6595893846b7fbda2bc6ee7ff9f5
font_02_sfnt_off00010dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1