Malicious PDF — malware analysis report

Static analysis result for SHA-256 b951ae93783a9a2e…

MALICIOUS

PDF

82.0 KB Created: 2021-08-16 08:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3c49ce31f9fc43783d3b35eab00b39c9 SHA-1: d5b59fe759cd9d3be411609473036f7ed80a1037 SHA-256: b951ae93783a9a2ed4788d1d2c75c0b257885121a779d9bcf79797896a784dbe
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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.
  • 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://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9f29adf0a---pixuxuzefaxe.pdf In PDF document text
    • https://palcev.ru/userfiles/file/jizizumajosag.pdfIn PDF document text
    • https://ijpdua.com/contents//files/jakibubiwufagatirutin.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/neliluzoxuson.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/walevedesebedamipawonex.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/861480804.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/xipopepasamibidufaxuxutub.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/gudidogedefaw.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/27077271263.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607dddb643ddb---jelosovekusi.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/45641773407.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/sisani.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/wemidanigasagumibinebagas.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd8b0b7c6a---rokexorabekidupobejebi.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/xujadisutasabumad.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/fipumefaxoruralupijake.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161132bd2e45aa---63102043881.pdfIn PDF document text
    • https://nada70.org/userfiles/file/javadojabigigaxife.pdfIn PDF document text
    • https://himanshikitchen.info/viking1/uploads/files/21281433724.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/givitosidi.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/0dn4agk6od1g5505rnenakcknd/15316238326.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/hb2tnk4ar0rv435rppnf7vfmde/jikeliladusu.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/nanugofubevuzutojorasunav.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210718053329.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=what+is+the+new+medicare+part+b+premium+for+2020PDF 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_off0000dc31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF443 16472 bytes
SHA-256: 240de9279d4861ab41f6623d1ccb5104f1343efd9cf9325b818d113bef6296bf
font_02_sfnt_off00011f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F04 11400 bytes
SHA-256: f66d1f0230c0357d3adad650ee99e06fa25025e7d0dde00f1383ea5fcaabb0c2

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