Malicious PDF — malware analysis report

Static analysis result for SHA-256 2495fe2391410b78…

MALICIOUS

PDF

78.3 KB Created: 2021-09-16 00:20:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ae2b8ba995c820cb5cee1c3fd4c34143 SHA-1: 9a23ad4cd8a6d9d56cbcf2d469d8309b77388eef SHA-256: 2495fe2391410b789be82cc41c9b183ef31c940f5e75afbc435e96fe1b98a2d3
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. The document contains numerous external URIs and is identified as a link farm, with many links pointing to disposable hosting or compromised CMS uploads. The primary intent appears to be directing users to malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://synerhu.ru/uplcv?utm_term=how+to+access+my+icloud+contacts+on+android PDF link annotation
    • http://lamay.de/userfiles/file/1486794529.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/85035002881.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135bb0d58e61---68327183525.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/mafuxulutaxororolobi.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/selunoxolikexo.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/febamo.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/xelivogisene.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/2pijh7u1ib3su2kob8mkjn0r07/28317498898.pdfIn PDF document text
    • https://fobh.net/userfiles/files/nibiziluniwomomafezaw.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/zobutil.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/wesedezu.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/73509153169.pdfIn PDF document text
    • http://irollee.com/userfiles/file/46349946565.pdfIn PDF document text
    • http://lepal.sk/ckfinder/userfiles/files/74408596595.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/zixikodusivira.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/rawojarotikagezuvo.pdfIn PDF document text
    • http://hcm-invoice.vn/hinhanh_fckeditor/file/nimerosaweki.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/nazoxuvoro.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/a0a74b8af816e4c68efb3b27723ffa8d/880211584.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/7ebaacd80d8585e1365893b221f4dff5/rovaxojivi.pdfIn PDF document text
    • http://bienbao.org/uploads/files/21112939841.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/80876689341.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/83237833299.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_off0000ce6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6F 16912 bytes
SHA-256: 4458249dbd7d6faa105adaed43d4bf2b55d79792486b81fb8ec8e7234918047f
font_01_sfnt_off0000fa2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11242 10824 bytes
SHA-256: 158464decc3b06df216115018185d920520da6c96b400c0e1c3b5e37cfd26697