Malicious PDF — malware analysis report

Static analysis result for SHA-256 d39a49800fa0be81…

MALICIOUS

PDF

81.8 KB Created: 2021-09-12 01:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: acf94196174244eeadde6d5da4369668 SHA-1: e9254853d9719c202d93c652ef11beb6f0d167a4 SHA-256: d39a49800fa0be811ae59950bfccbe0660a589c2b88ddebac2928331cff52544
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs pointing to various websites, many of which appear to be hosted on compromised or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious link farm designed to lure users to potentially harmful content.

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/86726530419.pdf In PDF document text
    • https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/dufosigegerit.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/37756823967.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/93558014179.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/joxiwawoketuzisiwe.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/dafibefagivurepuma.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1612ede2ee6c06---gataxunupider.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/18426136504.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/mejositusajavinumi.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/bakelewog.pdfIn PDF document text
    • http://ana-jsc.com/upload/files/88042254579.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136902738c61---tumivuzesexirerafe.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/rakitaxobef.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/61097239796.pdfIn PDF document text
    • http://maksimetall.ru/files/73555019220.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa6776f04a---vekexumozudetolupivamala.pdfPDF link annotation
    • https://fenicia.uy/fenicia.com.uy/uploads/files/840220283.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/zalepewenovebonuvigepiwe.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130cbd3824d6---gavokudubozorunafebofo.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/81333703260.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/hmgnbmfqre0c1ortbcnvf88ujk/64670207689.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/regesi.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/25521696022.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=redmi+note+9+pro+max+vs+mi+10i+5gPDF 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_off0000d78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78C 18020 bytes
SHA-256: eef59cabaad2212dc003dcdbda5530d0b6a8696311e384d8c5b17eb3e5c2a886
font_01_sfnt_off000106c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C9 11376 bytes
SHA-256: b483fb654e651d1b503c12055c914e0284a907f63ccff2cfa5bf1cf4fb6cca7f
font_02_sfnt_off00012183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12183 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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