Malicious PDF — malware analysis report

Static analysis result for SHA-256 e152e1dfd2e52ddf…

MALICIOUS

PDF

69.3 KB Created: 2021-09-28 17:31:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3836bfdc6f211a3248857511ee933163 SHA-1: 1da48638f63044eb0fc68602a3ce13357d394bc1 SHA-256: e152e1dfd2e52ddfb5cdfd9a03b395fdb097485a4ae225d80601fa88c564e24f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as a link farm, with several URLs pointing to compromised WordPress sites. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs suggest an attempt to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16132d858542bf---96130451958.pdf In PDF document text
    • https://thediamangroup.com/_images/files/75231557738.pdfIn PDF document text
    • https://media-get.com/userfiles/files/visikone.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/zoxoponodazuvaranok.pdfIn PDF document text
    • http://veterina-naslunci.cz/userfiles/file/9032596349.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/wafefozoxemivogu.pdfIn PDF document text
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/sulugisipobonasug.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/26110755166.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613401bd0ac98---wazizewu.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/jovaveg.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/duzaw.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///26796761057.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/56214970243.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/fuzumesetoduxumawadilal.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614584ac7b740---mipokegabuluxoru.pdfIn PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/53603412972.pdfIn PDF document text
    • http://djpress.pl/Image/files/83036762828.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/0175feb8c9fde6174184ececab63bd05/25560306848.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/55475918909.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/28451394713.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/kazulifubozomef.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/nusurilajivonewatowoso.pdfIn PDF document text
    • http://www.pvvc.cz/files/sejenelixizidug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=harry+potter+mystery+hack+iosPDF 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_off0000afdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F6 10688 bytes
SHA-256: 5f55dc38e7962216179994a8eadb2cfe7ce902ac88dffb38b9efebd7a14c1c7c
font_02_sfnt_off0000e086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE086 15552 bytes
SHA-256: 29699e49e5ba23d69c52e3176b49796719f43c3529ebcb3ee0726c26329da2be

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