Malicious PDF — malware analysis report

Static analysis result for SHA-256 5235badab33046d6…

MALICIOUS

PDF

85.3 KB Created: 2021-09-16 05:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5b07c0e2ca7939ec44f2c5f68ea504b6 SHA-1: e0dde765645116b511c110961d6a7801350f19e9 SHA-256: 5235badab33046d6a45e93223246c8f4117df813a60311027def0c66bf8cb0c0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure of downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=kaagaz+2021+full+movie+online PDF link annotation
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16142a6afeb444---xigetubeburevikaviw.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/0498d9bd991795a524d7bb3822320a92/nubovazizatimigadi.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/duwenuzelewajatika.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/semunuzodavurixizi.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bbda53c5b---61150993203.pdfIn PDF document text
    • http://calisnt.com/uploads/files/28192867141.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/titowidogegadumidak.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/feruwaroziduwexar.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///potanod.pdfIn PDF document text
    • http://learningkey.org/userfiles/70357933865.pdfIn PDF document text
    • http://only-svet.ru/upload/files/30145262320.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/juritatenapugigukabew.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/15166748540.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210903200024.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f097acc78---40369812149.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/putamivezevuzaxa.pdfIn PDF document text
    • http://bdnchem.com/upload/files/dodorasasekejosotat.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/13308286047.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/62955048970.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/37780670222.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/7558864390.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/dogigitubejarebi.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161428ed010ec9---53094681874.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/20931815759.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/26804575154.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/mikominokem.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/wanuk.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_off0000e665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE665 10704 bytes
SHA-256: 97ac77c9573fb677ddffa48410aa63ee4dca6fd0079ed50a3bfeff68a913fd56
font_01_sfnt_off0000ff15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11727 18516 bytes
SHA-256: 815c979606e4dec28acc90606ee03ed5d6a558e2f20feaddda577be3b52c009d

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