Malicious PDF — malware analysis report

Static analysis result for SHA-256 b332f5cc05ab685a…

MALICIOUS

PDF

76.9 KB Created: 2021-09-08 00:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2bf3205284a3b32cbf92e24bc2e90c92 SHA-1: a7e563b107e6cac07dac595d0a8612bec258175d SHA-256: b332f5cc05ab685a6777f5d2f2c46ae3e95afc2d7da6a51b34ad93f3de0a9091
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://thegioixedap.net/upload/files/5471362427.pdf In PDF document text
    • https://nutrishop.in/ci/userfiles/files/48142922894.pdfIn PDF document text
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/72119341993.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1611bbd6319982---37448849262.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/61376809198.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a2864c5510a---7448257695.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ec906cfd1---72240540814.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/ba61342e44e326b92ba432cb8fe39cd7/53617536216.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/f8d5703bcaf548b51df43fc6f6b2005c/nukatazofizigexoxoxupog.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345b7eda60b---14467610082.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/zoxaxojesuviwepizurefit.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/438953739.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/87885236753.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/tavebexigagowotipozo.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d9cd6e62a64---zazekomositeb.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a8b18356e---newuberusolafowimik.pdfIn PDF document text
    • https://fishuntpesca.it/file/povevezejigiluxodomeze.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/jivoruzezi.pdfIn PDF document text
    • http://santabruna.cl/upload/file/xizevazasopofosije.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/sugeweraxizukubabotedaga.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/4cc0060625c5480164d9fa8b6cdda05f/52044599084.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a16ee99730c---4945191904.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/16094862488.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/laluwitimegabisiwulu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=tidal+sedimentary+structures+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_off0000c9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B7 10840 bytes
SHA-256: 4643f66278f18622dabd74a36ca73c88827dea84b4e76721a27664c1ff197c25
font_01_sfnt_off0000e2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B5 16708 bytes
SHA-256: 05e1ded132edd687b4b82ff79372c6d856f70f904ec8c9ce56a5d91d55bb4ceb
font_02_sfnt_off00010dad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1