Malicious PDF — malware analysis report

Static analysis result for SHA-256 87043e4477e72ff1…

MALICIOUS

PDF

87.7 KB Created: 2021-06-28 12:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 75e1dbe9e70d6cddf4a13e012e3f07c1 SHA-1: 47ff4e8343bfdff6519c18ddc0969aaf571e8ee1 SHA-256: 87043e4477e72ff18a4438fc1698ff82afb50853c066722c69a6b95c33ea0736
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. The presence of multiple external URIs and compromised CMS upload links indicates a coordinated effort to leverage vulnerable websites for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://huntic.ru/uplcv?utm_term=bacon+countable+or+uncountable PDF link annotation
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/pdide9hq6eb1pm425fdtgdkpm5/mofodamaludoniv.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/9ebr6iilcoko38l4j72h7iaib3/61029040402.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec8e15204c---tefavujorinetalorudoz.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/eslk7tsrauu9hp8oco5ck0l3v9/88531526162.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/3df4d2f8f8c5562422367df8457a7000/82895168960.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/wapagenawotavolinalos.pdfIn PDF document text
    • https://123natura.com/stockages/files/92236378751.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/34a1801b8dce57ad584ec2c83aee31fb/57345583141.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/2844c7105cc8db1b6ba58538f5cbc771/86567177129.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/665dcd3f13fcc78ae02553d8ab1d3796/pabeted.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d877a06247---binukumutoxesulemetux.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/givixugavaromerudebojuma.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/galibexoditejawixepakid.pdfIn PDF document text
    • http://dnepropress.net/files/file/panazulozipafipixoj.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/a825ed2bdbc6952a3f4fc0f8052ecc56/99223209965.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/29808642853.pdfIn PDF document text
    • http://c-amc.com/upload/files/dulemajujabawifapifatoge.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/dabelagilupivesujuxus.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/xolorotanegatiputepet.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9751f031d---muwanopelenifunamobab.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd96580718---59475082550.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4872f9fe9b---67047707443.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/badun.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_off0000f073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF073 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10885 19452 bytes
SHA-256: a6f533a9119a3c2751a3c7196732adc4e433f353c13d913fbbe66f0568afdff7
font_02_sfnt_off000138b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B4 10256 bytes
SHA-256: d1a7db90e56facdcdf351148746b8eb2f38d75797c6d9e82a98ff8d1d5e793b2

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