Malicious PDF — malware analysis report

Static analysis result for SHA-256 81cf7febfd6ab7ce…

MALICIOUS

PDF

82.0 KB Created: 2021-09-15 19:17:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b30e9659e87bc0be10acb1748ef05dac SHA-1: 2463b86f8764c94a2834d46d10804411cfabfbaf SHA-256: 81cf7febfd6ab7ce817e7cb044e7246dd4f181a3282d9d89e784a8e74d613d95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs that form a link farm, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of multiple external URIs and link farm heuristics indicates a strong likelihood of malicious intent.

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://smidgel.ru/uplcv?utm_term=stupid+zombies+apk+mod PDF link annotation
    • http://chiesamadremarsala.eu/userfiles/files/36566175730.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/16703278328.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/sosireledavazosevelim.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/29204043961.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16130124e7b5ee---zivuwezenesator.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/692b0a180a356efb8a945dce3a791405/pesusoburetisemurixereki.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f783ae827---vawutuvilot.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/63017077481.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/filolidovipesunipo.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/zitagemunivosematida.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae80b77eb0---99676842058.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/gegamizarumabewu.pdfIn PDF document text
    • http://hidramaco.com/files/files/buwawelexid.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134a50e5d048---82573068807.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/2225730625.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/17594851320.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/73136241851.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/24596905494.pdfIn PDF document text
    • http://badgerhillfarm.uk/34007025090.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/dolaxo.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/18082582622.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/birolefegikif.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/13271287428.pdfIn PDF document text
    • http://wakabaeducation.com/userfiles/file/36400941409.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_off0000d4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C8 20636 bytes
SHA-256: f79a180bebce2b02cc63b54c3f74b060d9611b8653d02f750200ee32ad8df74f
font_01_sfnt_off000109e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12200 10772 bytes
SHA-256: 733c8db6b4fcb3ddf591ff301df63f1d26a8bf2b8aa8efbef40fcd5540512730

Open this report in the interactive analyzer, or submit your own file for analysis.