Malicious PDF — malware analysis report

Static analysis result for SHA-256 64b4060bb489b3d3…

MALICIOUS

PDF

81.4 KB Created: 2021-09-04 00:23:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: df05b8eb5bca9ab17f7ab51e19312b27 SHA-1: f3000d8ce9447f689a10165dd8df8fd339ede386 SHA-256: 64b4060bb489b3d3e790ce165df0b3378c79752c04106f7b665d7b2ee1af8ac7
156 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. The PDF structure itself is also noted as having duplicate object bodies, which can be a technique used to evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/9f9079fd9cb269b8047325acc3992eeb/95821785389.pdf In PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/77228452334.pdfIn PDF document text
    • https://hometutorsdelhi.com/userfiles/files/53598181006.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a65977923f5---waligujeluleluxoxipexofu.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/59279631223.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/29536c3c09932c37a5357934352720bc/80085958804.pdfIn PDF document text
    • http://bean2beenefamilytree.com/clients/60578/File/talubojepowutixezodiw.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/99339116074.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/zijotozunigiramobupak.pdfIn PDF document text
    • http://samrayburnclassof1980reunion.com/clients/873185/File/tejivulujobudovekalotoduj.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/1c2a43cf07a7a3aa299e98ed4361bb45/10698850686.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/55215727283.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/jigodolarob.pdfIn PDF document text
    • https://micsys.in/userfiles/file/vifazusagezamivo.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/59700013919.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/loputasu.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610df1b243ad5---60199715382.pdfIn PDF document text
    • https://equinox-e.com/upload/files/66605771574.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd52518e848---35097037239.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/362332120.pdfIn PDF document text
    • http://davidlbrooks.com/clients/868292/File/9863942866.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf84ce40c90---39244486254.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124d655e575b---34697080088.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fe8673e17cb---xiwopibojodaludo.pdfIn PDF document text
    • https://papiratisk.cz/soubory/11155577809.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/dc3d17b97f5ef44fc27bd52ef3ce4ed1/63226945210.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+read+violin+sheet+music+for+beginners+pdfPDF 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_off0000d662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD662 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE79 11448 bytes
SHA-256: 2995cd687f45f068cc08640320eeba0279c18438810ff30e127cf4c2c78a36b0
font_02_sfnt_off000108e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E2 17916 bytes
SHA-256: edb5e722469e8115cce35400c6ce7feb41a4b5f112cdb0e6936bcb926d8f3c4b

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