Malicious PDF — malware analysis report

Static analysis result for SHA-256 b95fa7a5cdd2410d…

MALICIOUS

PDF

87.8 KB Created: 2021-09-12 19:29:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f28981fbc96773f7198947b67c4658c7 SHA-1: 852f42fb65a7e7467b93bdca1a69c651e7c12a34 SHA-256: b95fa7a5cdd2410d9088448cc0b229fbd4bcc41018b6edec0de29c11aea5554b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://fuoriscena.eu/file/lojatunemegabudekibu.pdf In PDF document text
    • https://hotelmitrutarija.com/uploaded/files/66495545169.pdfIn PDF document text
    • https://kawanmto.net/contents/files/47266113494.pdfIn PDF document text
    • https://kamionosnyelvlecke.hu/userfiles/file/92898910995.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/6005164145.pdfIn PDF document text
    • http://moretonassets.net/userfiles/42300932773.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/61235111404.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16132cbb9332a4---59951942215.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/8b5fd2ead8b4919837eefef8cd9f6b0b/97102670792.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/73792247389.pdfIn PDF document text
    • https://gkatsov.com/userfiles/file/puxedixuturetiriti.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/lugiwaladokisoroxumaj.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/rowatesowumap.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/63362477336.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/gitoxumunibosedun.pdfIn PDF document text
    • https://cubic.is/userfiles/file/fuvuletudaxebonag.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/52706455692.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/11701399110.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9c4bb7be7---74506161532.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/79049941268.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/d54ae3ef7e97567368d238a5e86d2edb/49540638276.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/3dd1added0660d66ee2c05055c831810/53229952566.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/sogepizib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=best+android+metronomePDF 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_off0000ed52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED52 20192 bytes
SHA-256: 3286f3751438360158e3289b7a97a051b51455245b52438c53886bdc90d2ff6a
font_01_sfnt_off000121d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139E7 10416 bytes
SHA-256: cc633cefda935f670c39b369784860c5714051acd07d32aebc80107348af3988

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