Malicious PDF — malware analysis report

Static analysis result for SHA-256 683ce9cf5c17ef57…

MALICIOUS

PDF

90.7 KB Created: 2021-08-02 14:27:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 785f3ccd004e16fdd4040eddea280b67 SHA-1: 8e62fe62ae222c7cb263a8bd2fe484b942f4d39e SHA-256: 683ce9cf5c17ef57f56fa9830da3eff85eea452a0ded93e3b379cd0a940c245f
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish for credentials. No scripts were extracted, but the presence of multiple external URIs and the overall structure indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://oniceh.ru/uplcv?utm_term=how+do+you+write+a+sick+absent+letter+to+school PDF link annotation
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f542312a63e---33705436914.pdfIn PDF document text
    • https://filetorme.com/upload/files/farijuwozugupijev.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8ab33eb85---xetivedutajudakoxiwus.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ea527ae66---jafegupufefed.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/vasinexalolupiranozav.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/56e20696b6f5479889ee99d19987778c/sutogetorot.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/kisenusumojewuvonal.pdfIn PDF document text
    • http://banning64reunion.com/clients/a/a7/a71e9339640f4be667ed55590a288245/File/21645025123.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/0e3ef68428c32a34e7e807c532d3defa/24015372794.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/21156361981.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/9426357996.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/98581726096.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/m3h8rvqq24cl6cqpa8tq3fiaec/82156963145.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/267834643.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9879d390b1---dadasin.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/4ab2c15c5cfb1e1558070d0bc087dcf6/jaberupibejowum.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f37d0b20a2---faxalewumusaguladupuged.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/22s67enhm7v91s24nceuhu7re3/48870374957.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/ph8g31n9rt2uos7jig8jlkkn6f/vigexagijisorezegemipor.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a1773e51a9d---momezaso.pdfIn PDF document text
    • https://mimpisiluman.com/contents//files/20869053566.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acfd8eaa37a---dopixu.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b070dad0610---84216828120.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/valibakawulabopi.pdfIn PDF document text
    • 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_off0000fd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5C 10992 bytes
SHA-256: 9f387ddf0fcc41e402d22abcf450b238ee707576275bd6aaf3feae74eac91764
font_01_sfnt_off000116d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D7 17420 bytes
SHA-256: 9d14b02121116bc836c66ea4f55141a5e98f61a7a8a6f3322aa16ed15bb623af
font_02_sfnt_off00014437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14437 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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