Malicious PDF — malware analysis report

Static analysis result for SHA-256 083389a4aa41e2a9…

MALICIOUS

PDF

92.5 KB Created: 2021-09-06 22:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e45d50df9b70b79a07e7b613197963b0 SHA-1: cc47aa8ee0ff3769a4e2714d12f8523fe21cf8b5 SHA-256: 083389a4aa41e2a9a64f3ea35796863a8021954054254966521eb5b7543b60f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It contains numerous external links, many hosted on compromised CMS upload directories or disposable domains, suggesting a link farm designed to redirect users to malicious sites. No scripts were extracted, but the presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest the document's purpose is to facilitate access to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://oniceh.ru/uplcv?utm_term=vocabulary+activities+high+school+pdf PDF link annotation
    • http://www.praasia.com/file/files/silugigegobi.pdfIn PDF document text
    • https://chp-travel.ir/data/file/luzebosukagonutuxemab.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079ed19c940c---zimovadipi.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/92726375847.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/98625408313.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/5e3f81625aadbace759379f45a04d75c/werogotudopujosimoxaw.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1608319fb30884---foxobexufewuruder.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/vojozijixabofomoxoli.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/33866472309.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/46020505606.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/71hcbqrmrihsmo14llecbc41lq/62695739588.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/fb80a85d5a768a20c611ab4ceab633c8/jepovato.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/43554276799.pdfIn PDF document text
    • https://service-panev.com/userfiles/dewuzewevuravixonud.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/d47321d697f61ab841f368775841b547/66602149672.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/34472819971.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a655a0a548b---jozuwaxibofutuk.pdfIn PDF document text
    • http://hbleg.com/admin/userfiles/files/51243646212.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1609c97bee7fc6---merasijuvudisakalejes.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/tusolizadiwaxexo.pdfIn PDF document text
    • http://gibisch.com/files/files/67699177324.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/medenaxod.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca68111fbe---purasofedafusuzoke.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/datumevu.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/68765350458.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/3opi7qt81aa1g6423fnlgvr24b/86475771087.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16082008c198df---82204283758.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_off000102cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CB 18404 bytes
SHA-256: 5cf32226ed4b8bffc47844491576bdebda34b3b3cffa27b488d2e3d181115264
font_01_sfnt_off0001325d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1325D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A74 11184 bytes
SHA-256: 9389c0b7d61e524937957d4d2f31efe3b2fe247239fdad4d03908cfa603028d6

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