Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e4b2117fd83ac21…

MALICIOUS

PDF

74.6 KB Created: 2021-09-05 17:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4eaed09f2c71baacd8dc2095094d3a2b SHA-1: c497a1b929136fe94a56492f650922bc75827ebd SHA-256: 5e4b2117fd83ac21c6c2582b926aacbd7102fb037180551dea5eceafdb91c4a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to compromised WordPress upload storage, suggesting it's used to distribute malware or facilitate phishing. The PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic specifically indicates the use of compromised CMS upload functionality for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd452d38e74---87873313337.pdf In PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/01e8f3303d66befafe07acf00c521a88/kabikatarufokumawupi.pdfIn PDF document text
    • http://helloshoppingnepal.com/userfiles/file/83845575550.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/renekejexafum.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/57885752546.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/lidiritovob.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/vijubuvu.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/9s8in62v0qouaq5jlfi9hd0kid/4120025149.pdfIn PDF document text
    • https://proxus.nl/file/2906887097.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/654a2d5a127dc6fe7633db55aee1a5be/wivarelanawopopiridu.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/c25a41cea9d78938e799c5085cfec1a5/rikodor.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/gtch943b0hvsipvqijvisb35li/46698182883.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16076346017d7c---xepelumobitaxejulan.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/wuvifavode.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/89518963556.pdfIn PDF document text
    • https://smg.bid/ckfinder_userfiles/files/gojusen.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/08/25/file/71771161768.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/87036536073.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/bubefobade.pdfIn PDF document text
    • http://vieclamquantri.net/upload/files/11446174502.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/sivomejanarasaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=the+muqaddimah+ibn+khaldun+pdfPDF 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_off0000be4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE4A 10716 bytes
SHA-256: 344f9b796c2de8101406311cd2db3c01690168e906a9c0c7e324f5cfabf69f57
font_01_sfnt_off0000d620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD620 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE32 17940 bytes
SHA-256: 7f6e566794ddfa2bbda6b24febff50616276b6ce6313c293a0692b4d69d39104