Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aa81edbf6eed679…

MALICIOUS

PDF

70.4 KB Created: 2021-09-25 23:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2611181ee08dc19709441a99907c1837 SHA-1: 59a91277564398427d5d9b71ba814b89c34548c3 SHA-256: 2aa81edbf6eed6797a8b31be08fed7ae78f40077502df06d7ad8aa5137f966e7
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further support the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://exam11.menapoint.com/app/webroot/upload/files/vobakizifokorajodo.pdf
    • http://pronobile.de/catalog/file/tovefosipegeg.pdf
    • http://gsmontaggi.it/userfiles/files/29262320307.pdf
    • https://guineaservicesproviders.com/gsp/files/lufejap.pdf
    • http://di-tech.kr/fckeditor/userfiles/file/6247776084.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326f21ce0da---72715689246.pdf
    • http://dbexpertise.fr/catalogue_dynamique/file/xiboxezevesapem.pdf
    • http://debten.net/UserFiles/File/dikedo.pdf
    • http://sevennews.com.br/ckfinder/userfiles/files/40345124049.pdf
    • https://florerialafloresta.com/ckfinder/userfiles/files/wolak.pdf
    • http://alnadaoil.com/userfiles/file/zuwoxo.pdf
    • https://vatlieutaphu.com/upload/files/7647783380.pdf
    • http://www.bandungmesin.com/file/39971029960.pdf
    • http://school15-tyumen.ru/f/16728111866.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161499d00d3ac1---93756420490.pdf
    • https://123natura.com/stockages/files/laraz.pdf
    • https://alajuusa.ee/media/contents/file/46626386429.pdf
    • https://evpersoneli.net/ev-personeli/file/78118564891.pdf
    • http://archive-2014.humandoc.pl/attachments/file/lufogejekake.pdf
    • https://bokaichenyu.com/upload/files/99356373994.pdf
    • https://pearproperties.in/userfiles/file/duvulaf.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/2jg9djhn7m6gbahaqd9eg58qmk/8883980854.pdf
    • https://adikmanis.com/contents/files/94458811692.pdf
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/gamamonuvugib.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133f47a2f8c1---tamopimifelodabivepa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=iphone+11+pro+live+wallpaper+download
    • 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_off0000b1e3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E3 16792 bytes
font_01_sfnt_off0000c9f5.bin
446e946b8f4e5b40ded87224f7aaa999eca4e7070a36faa7998704cd6853f7f3
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F5 16840 bytes
font_02_sfnt_off0000f48e.bin
cce20f607d88416beaa2eb440cda81dbebe7ee7193729b9bdd25d6aa593cfd14
pdf-font-stream PDF embedded font (sfnt) at offset 0xF48E 10380 bytes