Malicious PDF — malware analysis report

Static analysis result for SHA-256 719fde620373d542…

MALICIOUS

PDF

84.3 KB Created: 2021-10-05 18:11:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d1a22bd47a8a94af6a9f6e5e76581f4f SHA-1: 0352fa11d86316e58b2ce4d9759df818ebfbd3c8 SHA-256: 719fde620373d542ad75cc0140457931d74bee324b06cbac9154532ea64b7dce
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites or appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading further malware. The presence of PDF_RANDOM_URL_LINK and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics confirms the malicious nature of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://belniig.by/public/file/memunuwewojepivizizu.pdf In PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141491ecfbbf---sarirulovimu.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/64511433123.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/wosurepizuxisok.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/22088291631.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/36467536567.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/lepikomi.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/28584431394.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/romamotuvuxegikisufan.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/77232675489.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/gawarepen.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/7d80176e3999cf205749852127b0248e/rujeve.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/kifabudirudofilowokelobi.pdfIn PDF document text
    • http://ud2-140.com/files/3714645106.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/tomigerigenerev.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/rezalanorurilik.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/e346e44df6c5eb1bdd129029999b8a3f/tijojizutilorixu.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16152c6821f39d---39677331030.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/92115602610.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/28861816769.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/xoxobowijurabe.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/vadoxo.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614ee17bc85f8---kusasusiwujoreb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=controlling+my+anger+with+my+childPDF 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_off0000dcf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF9 10880 bytes
SHA-256: 56e4255fefb41687eb847eef362379ab4a2ff0ef0dc56beb94d64862be6c312a
font_01_sfnt_off0000f5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010de2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE2 19656 bytes
SHA-256: 046f6978abf9eda1383a21a1efe8bcdf182987c6c4fdee1298988e8dd9a4722d

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