Malicious PDF — malware analysis report

Static analysis result for SHA-256 45200b0e0990fa7e…

MALICIOUS

PDF

87.2 KB Created: 2021-07-03 07:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 105c55988205c52f969d04269653021a SHA-1: 4ba85b398c186b50f34f24db3c41e346e1877329 SHA-256: 45200b0e0990fa7ee8bee1981b748142031ea2ca49993911fed1601125b6b124
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other potentially malicious domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=in+text+citation+of+documentary+apa
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d1899ee7848---7243980402.pdf
    • https://burlingame.com/wysiwygfiles/file/6792704301.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/ketj4bdp5f2mtjpkf75rlancql/57755810799.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160708e2496835---tejomipositorevilad.pdf
    • http://0851gay.org/userfiles/202106file/2021061807103870554.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/0memm1ua7370f0j3dd85tvhrjg/75706368416.pdf
    • http://bhhangkhong.com/upload/images/files/pobozibagunotev.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe9ddbe4d2---46284575732.pdf
    • https://hophamthaibinh.com/upload/files/40829005827.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cdc4727ed---37751057031.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160994443838f9---89376051655.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071d2f5b520c---72557562417.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/d5f89d318a612eff4400454636687c19/tipaxojijezuware.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/94c6fef6b2d74d553a174031839de4ff/gexik.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/ohbv3r4adh5gm4vi9crkmtj3vd/zudojawonuvawaz.pdf
    • https://gachbinhduong.com/upload/file/92891917621.pdf
    • http://leakefamilyreunion.com/clients/63964/File/segowutuxevo.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/e9f0b3ab71501231f7cbe0fa8777f5d6/29177863600.pdf
    • http://harryreichert.de/uploaded_pics/News/file/moxegogigajipumafugi.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e5ba55abb---debawolux.pdf
    • http://chinalanpa.com/images/upload/File/71427537630.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/b2d8dbedac4c80c3a50d6eca0de34263/95087783858.pdf
    • http://lnianemarzenie.pl/userfiles/file/jinipomixidomi.pdf
    • http://dailycan.com/userfiles/files/vebujogusurisokodupoxepo.pdf
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/jexuguvumitusara.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef34.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF34 16792 bytes
font_01_sfnt_off0001074b.bin
8b55126e19edcfb77bcc3b9464e49f6392fa1b211fdeefe24f01df957ef0f2cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x1074B 10836 bytes
font_02_sfnt_off00012053.bin
beef04c8fa9de36bb8bb7a99b98cafba7f1cae41ce8c365e57c439dde4b6668c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12053 18028 bytes