Malicious PDF — malware analysis report

Static analysis result for SHA-256 772fdaf6c0c4210e…

MALICIOUS

PDF

74.1 KB Created: 2021-06-26 06:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: fb38731a7f179e2992ea5ca22362a000 SHA-1: 062d7dc0600c4052268764886df1972dcf00a398 SHA-256: 772fdaf6c0c4210e2e82dee212b86762d4148849b7c92c8e6db3b1c2cccbdd73
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is identified as a link farm, with several pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://crewmak.ru/uplcv?utm_term=best+stretches+for+upper+back+and+neck+pain PDF link annotation
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/96921241f6d9000771eed3902cb6668a/sunusajolifafarelixikotin.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/1pdrggljfvvoejg52ihgbv6jm5/54212204013.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/99778795577.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f48dd7a3ad---pukivaginoxurib.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/26525866564.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/90388116153.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/28699218135.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/minibalivumuzoselodit.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210531_125944.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/bupaju.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/eacfd3f296eebaede3db9e7c1d563361/56176427649.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/ucghlo28opdsebsga1tuo793r2/77921076869.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/2jjau2pha9jgrchjpdhqo1ot00/47859559235.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a820813e531---novewid.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/xovalozewezosi.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085f2cd431bd---kerefiwuzexu.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/resutozed.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/kasuzaleseredapogeremuxe.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/tolavaxebuwekemulepobatix.pdfIn PDF document text
    • http://mobiliteit.nu/files/90075472984.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc34c7070c---neturifezow.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098b49818e35---tokuluwodurejumeposateb.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/1396931f5532192368f917f7b1f89d80/vaperuwegokagiwutapa.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fee3dbecff---45372695110.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/pogegokidorula.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_off0000be13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE13 11056 bytes
SHA-256: 16c851ed2f4a97961e1af50bfd18c18ab0a3d26ed5986e2c67d19dd0df7a0e10
font_01_sfnt_off0000d792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD792 16680 bytes
SHA-256: 9b2bd85e441129d7846b1e6cab282ff2b0377abfb69f62bd28fff94eb6358f4d
font_02_sfnt_off000102a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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