Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e7fb0ce4f8c1dda…

MALICIOUS

PDF

85.6 KB Created: 2021-09-11 03:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 39db2ab6470fb1f882fa1b66c625ece7 SHA-1: 641b654cf0321fc51c4f2e0565ef144ae59cb3fe SHA-256: 8e7fb0ce4f8c1ddabab7dc8c5445f4fd0b288c6b166174911d6ac25db2530fe9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to lure users to malicious sites.

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://melnikhouse.com/userfiles/file/73418998067.pdf In PDF document text
    • https://northwestconvention.cz/data/files/14361182093.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16132fabe270ad---94863230867.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/zibevurixifegapedotugone.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/d4a296dec91f7f56a10af09f44bd2e0e/xewudefopamoxokolirejam.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__613BD1203B2E3.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/r978p7h69vkkovpcl0k2q7bo7r/97351293854.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/noborufebudepuba.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/b40cb2590c13ba0bdfe52b6fc7b95fd8/8378580922.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/21164210820.pdfIn PDF document text
    • https://architektor.ru/uploads/file/19340439971.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/tulanuposukusikotu.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/pazaguterimaziti.pdfIn PDF document text
    • http://chinazzjx.com/d/files/sexugopimasejitojamudo.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/gijuribufodudi.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/bunonorudutuzerureriziga.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/mabitekegizin.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/vuxelabikadi.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/xovalet.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366b3641224---63087597186.pdfIn PDF document text
    • http://samtekelektrik.com/files/nuxigowibunanotide.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/zufalumavatefuvemusinet.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/bemuja.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/zipazelanono.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=come+scaricare+app+android+da+pcPDF 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_off0000eb48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB48 17484 bytes
SHA-256: e1dfe44ebf95e48cbb50ad75cd36db4ad4a9614b0a44739b8be404a84c4ad8ce
font_01_sfnt_off0001187d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13094 10564 bytes
SHA-256: 2e2ac780eaf3c9e280e81dcb058d262a562019429ab709760b501be7c3e3105a

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