Malicious PDF — malware analysis report

Static analysis result for SHA-256 87651b2a0421670f…

MALICIOUS

PDF

76.2 KB Created: 2021-09-10 14:27:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9578b1e293a5ef36c2dd1f909ee6a770 SHA-1: 275af0fd06a22351b68626779e0fbaae7272cce1 SHA-256: 87651b2a0421670f1996fc7a49e2d7c6db793632fa8f541e7d2fdb5cd2d64208
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent. The presence of external URIs and the nature of the links indicate an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3768

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://smidgel.ru/uplcv?utm_term=download+resident+evil+4+original+android PDF link annotation
    • http://plaschke-partner.com/uploaded/file/famufenofixikub.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/kesatazo.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/58597560923.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/zedulotukabaga.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/16440394213.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cd4968d60---32613689865.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/30117826120.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/bh38tekiqsir0g4pupalrhjc5o/97560661644.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/ragiruboxegop.pdfIn PDF document text
    • http://hijoin.hu/editor_up/wadezuluxubepitaviramipam.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/86704136102.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/84735019603.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210905190539.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/d59789e5f4ece119882efc1ea912779e/53232206423.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/bijetabudewuzut.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/53267493463.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/53eb1683bb7103d87ee7d615bfda1d5e/22947687384.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/kejazejeb.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d02132c18---vidilugipajagamanizatip.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/77568213644.pdfIn PDF document text
    • https://nhuadailoan.vn/upload/userfiles/files/3198756200.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/nenusij.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/92237529581.pdfIn 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_off0000d6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B3 10652 bytes
SHA-256: dd1ab3f97f1903609cba1e2415367313e5ec6b1f4210e7730abe4c8bc3d55513
font_01_sfnt_off0000ef14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF14 16856 bytes
SHA-256: a954dab636e4bd58f241b721a3dbd0b6b953dc67d8d3a5a4dd472fb52eef3163
font_02_sfnt_off00011adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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