Malicious PDF — malware analysis report

Static analysis result for SHA-256 d73aa5e3d449c430…

MALICIOUS

PDF

89.0 KB Created: 2021-08-21 12:41:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 288399e9fc855e3a261a4e554caf3d68 SHA-1: f42e2141c4f8e5689fb4d501b185b3e8ff2867fd SHA-256: d73aa5e3d449c4307ad3d646e9534b78aa05710d4fe86f09d6e6263797536c53
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term=business+email+requesting+documents' in one URL indicates a potential phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://chcial.ru/uplcv?utm_term=business+email+requesting+documents PDF link annotation
    • http://copy2d.com/ftp/image/file/34959471265.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/70325590486.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160947e00e50bc---mevelekuvijadetoroguno.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/divebozopiz.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/tlusem9lknfaose2pn6f2uhp17/duvur.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/kefotivatugapudo.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607957a6942b1---gamoso.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160bd766b1eac5---liruwodokurekelapowupof.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1623783444.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a287cd9286a---97488768202.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/mevegakidonidafekazewunor.pdfIn PDF document text
    • http://dongxuyen.org/upload/files/24491708903.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/99932496950.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcb1901a92e---92878112409.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/9b8ad9643c3327211613386eba9b98e3/bolerejawokiku.pdfIn PDF document text
    • http://popmetre.com/news/files/38551397161.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/mijobefozovaliji.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/46573905712.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161191dfdbae5c---59447180345.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/pjtoj6op4jdoql8te3mhn97lj2/kebaxomopajalomumo.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5b551e1f3---51619544162.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/gakobowewawigemogogalebid.pdfIn PDF document text
    • https://apgr.eu/UserFiles/file/sazoxabubunekat.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/11655982460.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_off0000f8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B2 11012 bytes
SHA-256: c15913810a920d7400e3a59a4e09ed7849afd64262108a9195306ca66ffaf73d
font_01_sfnt_off000111c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129DA 16620 bytes
SHA-256: 0fd4766040d9b82b5a23982b8fca4d7a87ab201d171ad70a0272834045f34902

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