Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f6a19e47c3befc4…

MALICIOUS

PDF

82.8 KB Created: 2021-09-05 20:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ea965303e828faa2a1d08a2591025025 SHA-1: 86554ec0510687e7e79d5733794d71e31fe21584 SHA-256: 7f6a19e47c3befc47f25db56318c6333c9b155d400dea4e9c2938e1d5b403423
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a link farm pointing to compromised WordPress sites and other domains, suggesting an attempt to redirect users to malicious content. The presence of embedded JavaScript indicates an intent to execute code, likely to facilitate further compromise or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c462e9d96af---1383635733.pdf
    • https://bandotrading.it/uploads/file/nejizatabugefuvupejex.pdf
    • https://alusol-kw.com/ckfinder/userfiles/files/30513426759.pdf
    • http://botosani.ro/img/uploads/file/49097819894.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/c156a78d8e99c801b519a2e24773744b/93923313223.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c79cd54924e---navubaromekenolobinatita.pdf
    • https://lifetides.ca/cambridge/uploads/files/42235689289.pdf
    • http://planbmedia.hufiles/woxelezusu.pdf
    • https://szekszardportal.hu/userfiles/file/wadewilewizenilirodokib.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/094c859dcf171e4557aaa1fc43ad7039/vavasoder.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/sqbve1oc29rcbj9dlsdq52a204/15740359940.pdf
    • http://myexamadvisor.com/fck_uploads/files/wujebizobir.pdf
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/depavasagafepejene.pdf
    • http://apvn.info/userfiles/file/1239932241.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/mf5nhn6ctspv79sqedp4id7a13/suwagemegof.pdf
    • http://fishtech.org/uploads/userfiles/file/file/43990220789.pdf
    • http://kino-cosmik.ru/sadm_files/71415313498.pdf
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/8618408049.pdf
    • https://mmagame.com/userfiles/file/lapovezukifojomemik.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4bb6a18e5---depufesugewu.pdf
    • http://pro-group.ru/userfiles/files/21645782765.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/xuvaluvixobegubutijuvis.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/161149e71ebfd0---japekojixemojudefevowut.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b2b8f2cd1---51344104087.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=advanced+inorganic+chemistry+jd+lee+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_off0000da4a.bin
da7980bb1c2be794bc77cd9082800043cacbf9a2ce31a3c3b4ec4049c660a2a1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4A 11360 bytes
font_01_sfnt_off0000f4ab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AB 16792 bytes
font_02_sfnt_off00010cbd.bin
df1eb4ed13d60622cabb590c3d3b50c0425ad8337349a1dea11645e58ac5b48e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBD 18692 bytes