Malicious PDF — malware analysis report

Static analysis result for SHA-256 5227f8318c6ed4dd…

MALICIOUS

PDF

74.9 KB Created: 2021-09-01 17:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 964da1c34865d24002561d0aece275d7 SHA-1: 5dd7f48293d0c6c2d45631b4cc334f5d8b887da6 SHA-256: 5227f8318c6ed4dd5a0a479995354c322637cc3598cbc81df78d93643bc7cd60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118165961c4d---pokuse.pdf In PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ba81ed0b9---71027191853.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/65327308904.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/b3e0ca0c315d737ac06b616612e2e42d/84705567412.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210829112405.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/5d41e7acd0b9d17663b0d56636bcab54/kafesexapuxegeloniz.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/jometebabugo.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126c614c5d04---vewotuduf.pdfIn PDF document text
    • http://bertolinacare.it/file/25281937145.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/37224898383.pdfIn PDF document text
    • http://rotang.net/userfiles/file/40479981601.pdfIn PDF document text
    • http://packamate.com/userfiles/fevorifelakili.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/22018606674.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/11833787997.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/75145673784.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/kebumafuzaguzonotujife.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/makifosejukovox.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/5059d40bef1bd1ce2b84849fb233fd59/dawoso.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/mixesemumosavum.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/7809b44914208a0f7e86f63a26b8d14c/wutifanobuxodifef.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/61560351058.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/77513428751.pdfIn PDF document text
    • http://ranch.pl/files/file/64855448646.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/76966752137.pdfIn PDF document text
    • https://inncredel.com/uploads/71659868191.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/dbd2567bb422a4037d0b00d84b4b1db4/zobanasebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=what+do+fish+eat+in+the+riverPDF 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_off0000c4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D1 16060 bytes
SHA-256: b019e88eaa4b2991f3bdfa1143306765a5ff741fc1e94650ca1b9e12d26e67ad
font_01_sfnt_off0000edfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10615 10464 bytes
SHA-256: 3c5c173d3cc111d21da62632365aed2bcb2846e7ff7a17da569278d82f24dce8

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