Malicious PDF — malware analysis report

Static analysis result for SHA-256 72bcb0424b55848c…

MALICIOUS

PDF

86.2 KB Created: 2021-08-08 22:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a5ca801bc16beaa0c2cc17887c5ae9bb SHA-1: 6e2472c6eee75bf0d13c49078990b2a7778e234e SHA-256: 72bcb0424b55848c07e417db29103703a62960ffcb998cde35884c4b60b0666b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. This suggests the PDF is designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • 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://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102522e91129---livojujutigalenusadawaxo.pdf In PDF document text
    • http://kpotplace.com/uploads/files/xurodon.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/10245c40b3974e890959027e67779171/tudepugu.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/2e304bdc0124904ed2257dd308e16cab/50269844261.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/kulovoterumiza.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/viben.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/39135593753.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16083ca1dbadb5---42640394013.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/6e8696624b850c2bb40cfb5d9ec9e2a7/fewibimugekesifoluwodove.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/456218218c29c9a1c66b3703f9c2b20a/fejixiwogesujujib.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/mamoxafupepurubemaf.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/e4suu1d2ft0d3k01egs1ufku5n/kajiteturonal.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/ddbc1e9dff19c3eef1176d07ec5b6fc7/narotapugukulixuko.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/38010541240.pdfIn PDF document text
    • http://fructusartis.com/i/File/14639463501.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/126a6aedcfeea8a0c0dd221c974aba7d/vupaduvunolujamopuxu.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/58b65bd966b26630ac991e1cb66d2caf/zufirosazidazu.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078aabca6077---jufeviroje.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/3c7009fa6e76b5d3cc9ba5d8adc52137/sepirixefefuwis.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16088c2a20a291---pakurevibeb.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210701041135.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/47879617473.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/wetuxidedabolibimuma.pdfIn PDF document text
    • http://xn--989ap7r0xbd5x.com/upload/fckeditor/file/97038895384.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=landis+gyr+e470+manualPDF 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_off0000eb90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB90 17472 bytes
SHA-256: 84c7f47366587e0982c7731185d3c54f5000b75eb7e82c24e80c7f4bdc9bdab4
font_01_sfnt_off000119b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B7 10796 bytes
SHA-256: b216f80f35ac38b7e3155768239e2f3c07a822eac2318ebd7eed9a0f18a273b3
font_02_sfnt_off0001326f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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