Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c94203e636ebcdb…

MALICIOUS

PDF

84.1 KB Created: 2021-10-07 18:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 01e44b22762c491df3e92e27badf5141 SHA-1: 0d6676f10de93449e681d0add913b3c818c7b44f SHA-256: 3c94203e636ebcdb627cc3fe39ef0f99c32799e1a550e4b443fdb4e3c68cbaef
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to potentially compromised WordPress sites or disposable hosting, suggesting it functions as a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://sssmri.com/ckfinder/userfiles/files/xusexodabosaziwu.pdf In PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614d91528e608---zufabojuti.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/xanumezowadiludirudevux.pdfIn PDF document text
    • http://e-sportis.com/images/upload/5412806437.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/wememuxipaluxafazaf.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdeb409623---sobugimosejilojox.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/74063464142.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/newetemiferadopo.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/selovifabele.pdfIn PDF document text
    • https://anaksemut.com/contents/files/vumemixoweruzujetuz.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161436e315f52e---joronafa.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1615b216547395---21733409688.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/bubojipezisivare.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/38917799645.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32011973214.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/65901866521.pdfIn PDF document text
    • https://bipalisdemo.dashindonesia.com/userfiles/files/kuwevo.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/37590851261.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/87810519617.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/63806412806.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149cbf787ea5---ditiwonujipilu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=top+sites+for+downloading+tv+seriesPDF 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_off0000e07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07E 19076 bytes
SHA-256: 7bc6a5594195491914cfaeb652bf36210f08f7b448bc4dd74c586a7a14309b7a
font_01_sfnt_off00011236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11236 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4D 10788 bytes
SHA-256: 6f976ba4fe25ef31677aa1252f7fe691bfcd5320b27ba0ced3fda68f230cf04e

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