Malicious PDF — malware analysis report

Static analysis result for SHA-256 898016d99dfa66e1…

MALICIOUS

PDF

103.9 KB Created: 2021-06-26 22:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4baee5cf04ce693a0db55822b3b21c65 SHA-1: 8503d495db04f3a9b613df6565ca32ac6c078704 SHA-256: 898016d99dfa66e1e15e9d1351eaef535cb5273c5b2e381931a0a7f350d0ea29
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers confirm its malicious nature, likely as a phishing or malware distribution vector. No scripts were extracted, but the structure suggests it's part of a larger campaign to lure victims through compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/iqvct2jjlpovcmpd7mepragjh5/79900336275.pdf In PDF document text
    • https://yepsell.com/userfiles/files/14344429551.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/11113156748.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/19468bbe0e6151e510daf9f7ed701d78/donolipa.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b663c1c79ec---80469933872.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/odfhj06hovl6chpqdfir0bq4se/babibagunu.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/42765501405.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bb033a385d6---petipuzofikipewi.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abbcab4a348---33299774298.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/8fa338be15074c604d885ec0f976c075/nupukejejuxo.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/3d921a78b64edcbcaac44de7d73a86db/sipexikibusogizimafiloro.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7d567bbe4---72570507853.pdfIn PDF document text
    • http://amdind.com/userfiles/file/37148653080.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/dozotigugezafazaduke.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/mewenubawomokamol.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cad6542bac0---28866446169.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/33526099817.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/7sa3tn16c74gueu9ill5sjsu9a/77408344987.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/7c4d12a3084f62ee0b94220cc14127dc/gifezinu.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/mexewodupinaj.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/62d0876dcf27374bfe7a906588b45bcd/55917403066.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/41103889206.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607089ca670a7---82913869410.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/3be246adbe4036996531772da37b6014/bagosarudugotafuwoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=mary+oliver+winter+quotesPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a45ecaec076---gagomaxidikekusi.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_off00013531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13531 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014d48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D48 10604 bytes
SHA-256: 5164a9b89893054ff75fb427e46501ae655561343387334d80cb28c9d8d99264
font_02_sfnt_off000165ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165BA 17212 bytes
SHA-256: b0e0ff6dc66857db2b9b132154902600516eb8abbb0f552b1cb7719b326906aa