Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1ba0fbc77520b46…

MALICIOUS

PDF

80.9 KB Created: 2021-09-01 03:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 225926fd9708fa579ab6fb357e9d6966 SHA-1: cbc096d88353739dc004c0713adfdf8ecf4b294c SHA-256: c1ba0fbc77520b46fcb74a2e87c74bc5bb56f078bcc89285d49d0c28c31c1559
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a link farm pointing to multiple external URLs, some of which are hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware download sites. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • 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://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/91686016757.pdf In PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/31678101605.pdfIn PDF document text
    • http://wearefamily1234.com/clients/3/31/31b46d3307e4516335aa88350909469c/File/36411864782.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/0b084c7b1ea30854fd20f667292e5ff8/11998650051.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/4qc383e1ba5irvk2vkgdcs75b7/40552228836.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/41759990987.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/7121102448.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/lixanelofowekuvumip.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ee2e834f60e---80542563242.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/9b0691c89a96c677ec80e2bb9792e147/32489129683.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/fobudiwim.pdfIn PDF document text
    • http://nemochem.cn/upload/files/wexebaf.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c84ca27ce2---33236322583.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf2b40232a---fusebapagazis.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/967105464b8ea48746be3900a31718d3/luwowudikulexak.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/22197593699.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210729_67BE118D5E6DB6A8.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ad53acbcbc---demofavufajek.pdfIn PDF document text
    • https://amgaa.org/temp//files/75185178966.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/14562008204.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/33856436866.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/69612972235.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5596042f2---11338897541.pdfIn PDF document text
    • http://toonesk.com/upload/16686699066.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/74739627089.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+convert+improper+fraction+in+mixed+fractionPDF 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_off0000d389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD389 10812 bytes
SHA-256: 8c721612fab641330f6fba43f65fa5f43f08108150b1403841db2c88d1376b1f
font_01_sfnt_off0000ec78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC78 18628 bytes
SHA-256: 8ed1b8345563b5d003b904307b3bd64fc1fe03b1257347fcc093853a6296687d
font_02_sfnt_off00011bef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1