Malicious PDF — malware analysis report

Static analysis result for SHA-256 66719348bffe7382…

MALICIOUS

PDF

68.8 KB Created: 2021-10-07 10:58:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9f01a6c4d1173e9d2976d208e51ace25 SHA-1: 8561765e86a4108465e309b92699900fe848a0b5 SHA-256: 66719348bffe738236cd7a125b40d1a5e7ff07351c184bbf81f0b0f3dc7fefa1
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF exhibits characteristics of a phishing lure, including an image-only design and multiple embedded links pointing to potentially compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs suggest a link farm designed to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://yellowmangocafe.com/userfiles/file/karigixe.pdf In PDF document text
    • http://eaas-journal.org/survey/userfiles/files/tekimigukukisaxenamobasin.pdfIn PDF document text
    • https://conviviodihera.it/dati/upload/file/xefejosajesisifak.pdfIn PDF document text
    • https://negaratoto.com/contents/files/760758007.pdfIn PDF document text
    • http://www.programasaudetotal.com/arquivos/file/luxipofug.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/80337846607.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/tewusitume.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/82467319712.pdfIn PDF document text
    • http://stilna-ya.com/_userfiles/file/61846385734.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/85ed38a066d45c1098318ee72f6b34a8/73403635883.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/96575730556.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/62781040300.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/31314237099.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/zujixanaw.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1613838d539b5e---7688107869.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/bd54d3b83ca5863293ee6b756597c536/64995136953.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/vubujif.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/jizeritegezav.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614decd15cf70---74254338675.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/28788554551.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/tuzud.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/50962013619.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-22/20210922182421478731.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/86993359185.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/sabomorebuzisagabosu.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/voniwug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=to+produce+electricity+from+geothermalPDF 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_off0000b1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A2 10972 bytes
SHA-256: c32c7ef4b7dfb3d5db771b4d797233a7e68b0792eab9e32c5706b10e4b72e4bc
font_01_sfnt_off0000cae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FA 13996 bytes
SHA-256: 40eb76f7406975c9ed9c996a1c29d354e9f99cc710a0c1e0740d233f0547ed40

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