Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eb7d5a7685141b6…

MALICIOUS

PDF

98.5 KB Created: 2021-08-17 12:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dc9742ab3f333e493429cbb7f0474846 SHA-1: 63e96a3a486ca5e15bf197c572c786b99c515dd0 SHA-256: 7eb7d5a7685141b60b5a285e4d3fa4690e81a7c0842f4fcc1e88fd3626141264
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/1260c52165289209007a9121535c357d/82938992878.pdf In PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b86a864ea---75176997585.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/koromewokimuvimanaxe.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/slimprc6iduopprdnrr77ra051/tilixinube.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/20694d6eb4835daad5d5559924991648/60574756868.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16071f7af1fd7e---57787695994.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/mosefoz.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/71504743026.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/k6sfone8oterq6mtdngj8vk5r1/kavedonejetu.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/2ac20942a978c6d382cdd6899ae28165/59695160092.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/95534702413.pdfIn PDF document text
    • https://termoformat.md/img/files/90923218297.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/59719736300.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b292cc13ce5---30011812607.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/50027465162.pdfIn PDF document text
    • http://hak-al.com/resimler/files/durekaduwifag.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/7993344882.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/92285777043.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/f622r6oatmi8u4fn140l5hgift/xoviwonaputafogedaja.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084272839ecc---jafuzibanabekeregutesoza.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/k6qufj1tt8lqt92mq8hlmlh7bs/84473228844.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abddccc34b8---zanufejuwexarerotelafi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+are+elements+and+principles+of+art+important+in+creating+an+artwork+brainlyPDF 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_off0001180a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180A 18088 bytes
SHA-256: e391ba1f772bcbf002c076b175e0ca1739bf793533a741be2be8473ada9d9502
font_01_sfnt_off00014694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14694 11388 bytes
SHA-256: f5315bbd9fe2ceb0c2276055b228d406f41d0fa9956155546de398fcee778040
font_02_sfnt_off00016102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16102 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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