Malicious PDF — malware analysis report

Static analysis result for SHA-256 8934968c5e5a8de3…

MALICIOUS

PDF

105.8 KB Created: 2021-08-20 17:07:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fe1f29fea451309e6f8edff322bc8f3b SHA-1: 58bd1baa8db1ecaa9886a9e32646baf05ee0a32b SHA-256: 8934968c5e5a8de38bf042128bb3c334b0f57b776d7e3f9e5ebc2f1bc7cdb7a6
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains embedded JavaScript and presents a lure to install a browser extension or update, a common tactic for malware delivery and credential theft. The document also hosts numerous links on compromised WordPress sites, suggesting an attempt to distribute malicious files or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/mota150bv4idbr5ema9k8bi7bq/wunuxekerejutunivuduganep.pdf In PDF document text
    • http://czpohledavky.cz/userfiles/files/20002240657.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/b18affa714fd196442bb941141f81921/68360643651.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e4ba024d9---42170758520.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9bd938571---buvegixuruwewileju.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3bb4e9153---65907723766.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/ms3rmjbdgl0pimh2htvie1h677/xavixaserujovuledobibam.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rumit.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/40025093431.pdfIn PDF document text
    • http://delve-cr.com/uploads/kudakuke.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/dofinosomagidemisabage.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/bd80c2a381ca6277e248963d25054cea/nugetuzumilekupu.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/4992035174.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/96519417856.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2107281303092277469z2xdm.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/lbe2c86npc05cebp30doq0dh2t/92207135378.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c34ace0f8c1---lotufipelopugu.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/4387000434.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/6cff9144fa11323872e2e232bc91bde2/radakasanusufozavadi.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/wimaxudazijuwokejinona.pdfIn PDF document text
    • http://salinahighschool1968.com/clients/3/33/33fcb9b832a528c934b1ac42c6b88a99/File/37154359920.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+check+internet+explorer+version+in+windows+7PDF 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_off000139bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139BC 17720 bytes
SHA-256: c9d6975c4f8e5727d3c3fb6892a3200018fee05516e55e0a8b01f58f8c0da43c
font_01_sfnt_off00016838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16838 10836 bytes
SHA-256: 79446bc4e60324dae65f11a3d06c56a60f6fa71d8e6667b0cc8cc2945199aa60
font_02_sfnt_off0001813c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1813C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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