Malicious PDF — malware analysis report

Static analysis result for SHA-256 8079c6f5c0868566…

MALICIOUS

PDF

76.1 KB Created: 2021-09-13 13:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 56421f50910ccd7b4ee365e9a2d12c77 SHA-1: ee7e9a4d68a114596598d7660daec9b4b1ad7533 SHA-256: 8079c6f5c086856623139cb6236202cc36fa4ba2a96289976d1c579b98efa2c7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to various domains, including one hosted on compromised WordPress upload storage, suggesting an attempt to obscure the final destination or leverage trusted infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://jeanchapleau.com/userfiles/file/kozizupi.pdf In PDF document text
    • http://allmedicus.com/userfiles/file/vugujekiwavogonajumelexa.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/zukabuga.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/88998270581.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/zilaxeberovof.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/ee6t20docekv6co5dg84aj5hd6/jarobosefinogi.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/lujota.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/98692061801.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/20107893299.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/17962826262.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/98458882924.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/07f3b82a7cc796ab56dfb3680859f61f/nogiresijelokidiriretadi.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc51765735---tupanufinejologegegoxi.pdfIn PDF document text
    • http://zonweringbelgie.be/ckfinder/userfiles/files/jagitadiforapuzogakom.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/22664441936.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/popojufivevum.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/dakatiwajim.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/98600319763.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210902210401.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/bumora.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/pekogonukofipipekeze.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/jadimutenolujirorek.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/54166960555.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/43307759444.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/80631459184.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=hack+for+8+ball+pool+iosPDF 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_off0000c7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C5 10568 bytes
SHA-256: 034ec1551033d22a3384ec45a223e54b31afb38cca180fe3fb1c80bc34d304b7
font_01_sfnt_off0000dfbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBB 16672 bytes
SHA-256: 06b6a39993f20fdef0d0211304d13c72f3f728c5b46568acc243ced20dafc7d0
font_02_sfnt_off00010a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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