Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca5eb0bf4c626950…

MALICIOUS

PDF

81.8 KB Created: 2021-09-21 20:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: f45029c7e59e53456f711f8658458200 SHA-1: 5832c2dbd61045157f08d354db6bd9463906e194 SHA-256: ca5eb0bf4c6269500df531d496afd8e97170580fcb3e2da88f71e399870c4bc0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate attempt to obscure the final malicious destination through a series of redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://cructi.ru/uplcv?utm_term=one+piece+dub+streaming PDF link annotation
    • https://pezenasenchantee.fr/userfiles/file/kawojiramifam.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/itnjl9scsipaa0801hph55dos1/lugokomumufosomapux.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/54290336780.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/tesujukezilud.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/piropafezofos.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20219171733386707.pdfIn PDF document text
    • http://yoron.net/up/files/55018403098.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/ddc245392d0c08ed76281fa99171b541/28356621922.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/buwukijijivanonoveku.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/jerukixoxumu.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/64692835502.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f697a3d286---nuxuwitip.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/fajum.pdfIn PDF document text
    • https://fong-cai.com/upload/files/bopewudosanilixosoj.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/wazuzusavasabowufuxuratoj.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/66437906326.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/zugugixe.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/filigidaj.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/42822192480.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021090603494330.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161332444c9f77---gepewip.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/xelidetajewekusozeda.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/jujeno.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/givefofub.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_off0000d867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD867 10956 bytes
SHA-256: 16961faeb612ac2a06a8902d07f0b8a25e1d9abadc09c25323321d95bb764c3c
font_01_sfnt_off0000f16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16F 18384 bytes
SHA-256: e62425928776dc07c37fde797efac21f4d61c7c36c61501d7626d739e50894d3
font_02_sfnt_off000121da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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