Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fc4a245ebe8e870…

MALICIOUS

PDF

99.5 KB Created: 2021-07-10 11:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9234ebc053a989253ce14ac245aaa8b2 SHA-1: d589acc4bd4c27bc6c1f73a27d0900b1f41c99f6 SHA-256: 3fc4a245ebe8e8701f85ea7d946c4d40269678c1c39e93bae48f24c58ae8e46c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to compromised WordPress sites, indicating it's designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure points to a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/d35d14c16a6a7f508a39b44011a645fd/23856306307.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/7af67a9527e5484ac6e5db8a356eb870/8675085229.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/4ee59a3f8f44b1a2e10228aabcb15518/5788034482.pdf
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/32453950865.pdf
    • http://nt-module.ru/ckfinder/userfiles/files/28210405651.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16082980f1ad4c---pajakelovulexakozafasoxa.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3876d5edf---14389222460.pdf
    • http://pokewaveanaheim.com/uploads/files/46578108116.pdf
    • http://dentherapia.hu/files/file/rukedinugizewabodoxebazi.pdf
    • http://xn--aknmedikal-yub.com/uploads/file/wiwufuwuw.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f801bc6adbec9e2e7c48e838d897c2ce/rijiwomibagibapapab.pdf
    • http://bodegaadrover.com/userfiles//imagenes/47257068131.pdf
    • http://berbun.com/user_img/file/57213612797.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609946fbf2c5e---lojiwa.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/e149c07e622b61a2a7ac742e690dac26/somukalumiwilovoborumina.pdf
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/goler.pdf
    • http://songiadabinhphuoc.com/upload/ck/files/disutuxun.pdf
    • https://alihuata.com/userfiles/file/89669262326.pdf
    • http://hilltop1976.com/clients/24685/File/4319064122.pdf
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/29010432705.pdf
    • http://liavanhaeringen.nl/userfiles/files/nigobibamosi.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/0a839340117829a25b0e5f5594c22fb5/57464649255.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=tolstoy+letter+to+gandhi
    • 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_off00012466.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12466 16792 bytes
font_01_sfnt_off00013c7d.bin
90ae6337d5fe8e2e92266801a7a6952e02b82fe05c5a53a1a1a52a4ae9fa9d9c
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C7D 10604 bytes
font_02_sfnt_off0001547d.bin
646def1c234c099f7bd6b12f576d9aafda4fc082edde533dcebb358c17196856
pdf-font-stream PDF embedded font (sfnt) at offset 0x1547D 17356 bytes