Malicious PDF — malware analysis report

Static analysis result for SHA-256 e40c8d204c04210a…

MALICIOUS

PDF

69.4 KB Created: 2021-09-29 07:26:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2bd2dc77b1603e60b04f4b9a283434a3 SHA-1: 3c22a454d8401d811eb0f719015b7343a66b9748 SHA-256: e40c8d204c04210a0d335f69af7d30ca9efc2493c1811269168fd02cb7a81751
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting an attempt to host and distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1614b1075d1506---jukepugoriv.pdf In PDF document text
    • http://tauroconsulting.pl/userfiles/file/tofufafakutesukino.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/68547350221.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/muxafiwabinokifolos.pdfIn PDF document text
    • http://armanetti.com/images/lafejotas.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/poludegofe.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/99053859958.pdfIn PDF document text
    • https://lombardpruszkow.pl/local/userfiles/file/26322481091.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/sejivumiv.pdfIn PDF document text
    • https://hotelcorona.ro/files/23025900519.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/rinutimavepunarugasovanok.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/78608020591.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/ce95a47a0af9ea1d4921363e372d4779/37336486626.pdfIn PDF document text
    • http://vitrine-prof.com/files/sakep.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/25405011000.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/rekokobebibugesidigorozor.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16143e4a7b14ae---sizexususal.pdfIn PDF document text
    • http://apicn.net/upload/files/bokiwuxoxujofuriso.pdfIn PDF document text
    • https://totounited.com/contents/files/5462651045.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/jojuli.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/bipezinegejutejetiwomuto.pdfIn PDF document text
    • https://specialgarden.ro/userfiles/file/nemot.pdfIn PDF document text
    • https://signos.larrialdiak.es/files/galeria/files/lafutugow.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/79839055534.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202109230320024090.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/ca6e1671d6e4574131f33d492b1f61b2/40006187903.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=kutty+movie+app+downloadPDF 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_off0000b114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB114 10640 bytes
SHA-256: 17aa9a1e3a56be83b71d19dfc99ec197912ce3e2447de91be835196c0df6475a
font_01_sfnt_off0000c96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96C 15332 bytes
SHA-256: db34cebbff5739cc931c87e92d1c54515ce37bb060d968ace8e9752be0b4ca60
font_02_sfnt_off0000eff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1