Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e4669bd3dea8267…

MALICIOUS

PDF

86.7 KB Created: 2021-08-17 02:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 57ac03747df1af01abf89c5757f282a3 SHA-1: 609de60ee45959ea0961b5377aa93eeec99e7cab SHA-256: 8e4669bd3dea8267397505ba26eaa390b5d2b980bb7f2161ebf4a01f53358021
184 Risk Score

Malware Insights

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

This PDF sample was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It impersonates cloud document sharing services and contains an embedded JavaScript stream, indicating it is designed to exploit users. The numerous external links, many pointing to compromised or disposable hosting, suggest a link farm used for redirection or hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 8

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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 http://anhuishangbiao.com/upload_fck/file/2021-7-5/20210705192733747864.pdf In PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/c8f683757e7d7a5dff790bbc83144383/67137679229.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/45918229694.pdfIn PDF document text
    • https://luminex.pl/upload/file/1648360119.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/16231827352.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021052404144373499.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/timeromudotazip.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/2cc9a0c9902bf2ecfd6b03edc9004b12/lejof.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6f0cf1b07---30098762422.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/vaxujewekobilinab.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/bofilu.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/38407002781.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b4a599726---91174586994.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/84099094879.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097f33aba465---valupebulebilomo.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/qnp74ktdluh1bclmk1ea9etbrl/43964243760.pdfIn PDF document text
    • http://alternatifmedikal.com/img/userfiles/files/modaf.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/51140734019.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/ziropomavojasug.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16079003dd8378---73246899841.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=guardians+of+the+galaxy+google+drive+part+1PDF 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_off0000ee8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8B 11252 bytes
SHA-256: c8d41cbec5a2625930df5a52827ca605759ae3cebb8ee19cddf8e50e716aa7ee
font_01_sfnt_off000108be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BE 17216 bytes
SHA-256: af2e72116a5eea5fc68ff057505fe36f0bad46ec240c2eff7d02bd35401b8c03
font_02_sfnt_off000135ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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