Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7f5d24a79525bd5…

MALICIOUS

PDF

83.7 KB Created: 2021-07-24 23:09:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 60766769686d8bd96ed9b56c20f798c0 SHA-1: 23cfd941041a15f38784a988fdd729f912711f9e SHA-256: a7f5d24a79525bd55d5d04d666748daeeb2db166e6cdf63014eb1b31e3cb587b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous distinct hosts, many of which appear to be compromised WordPress uploads or disposable hosting. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings indicates a strong attempt to obscure the true malicious destination by leveraging a large number of intermediary URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://knshzj.com/CKEdit/upload/files/91413142150.pdf In PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d855e559af---28018123997.pdfIn PDF document text
    • https://groupunsur2.com/contents//files/73927924371.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b10e64e7c2b---monatuliponinuxa.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/wibako.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/09drtcef3uqe0ooh6m063j9sge/48450627315.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/webolalipegujazubifexi.pdfIn PDF document text
    • http://hphs1958reunion.com/clients/47465/File/sotunawobugexiwalexovub.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808d3d36e79---jabitoxodavelaxe.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf3a6bb131---jagabudepufuzitakas.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/164986199960be10c5d1f80.pdfIn PDF document text
    • http://candientuvibra.com/images/file/72285741492.pdfIn PDF document text
    • http://honda-vo.com/upload/file/65195957189.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0939611b08---87138552621.pdfIn PDF document text
    • https://cubic.is/userfiles/file/pesikepitowoxoxirom.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/qp06hjs6bfks3n2je60s9nil8n/8453386396.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ad028ab3598---22514099649.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/sesadobapuwopuwisofawozum.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160992b36f09e0---90731899501.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f1a23aa70---nezegodugaroxuti.pdfIn PDF document text
    • https://rajaketiga.com/contents//files/41757682185.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/08715f2864b86cc9b3975152b1b57352/66750305871.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/retiginalebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=gta+san+andreas+cheat+menu+download+for+androidPDF 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_off0000e447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE447 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5E 10964 bytes
SHA-256: d5f29bb40c735f88023d9f0a81aebeff441ea3b37900fe9a60ecb4afeb06f619
font_02_sfnt_off000115ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AB 16624 bytes
SHA-256: f9883d51268516a5ef1b1661404b8590baff6311c2d58d6e4efdbf188207b02f

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