Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bbf7b92e4229ca0…

MALICIOUS

PDF

87.9 KB Created: 2021-07-28 06:05:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e5086d0a0d6ad5e0a9bfba82cf5221f2 SHA-1: 65341bc12511ee5d77cb476d7690b90a157c813b SHA-256: 4bbf7b92e4229ca0bf1d4bfe85cce176aee291327d934bb76bce9452271347df
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple domains, some of which appear to be compromised WordPress sites or hosted on disposable domains. The embedded URLs suggest an attempt to lead users to phishing or malware download pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bronia.org/userfiles/file/sisozebapa.pdf In PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/ff43c9e6a738b5d286bf1ed2cee84fc5/87494364274.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/74010678249.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/93vren2f5eonbq96pfg1ehcl10/3597799692.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607517fe9ca07---gaposodiwututute.pdfIn PDF document text
    • http://gsoutreach.net/clients/e/ea/ea4f28bd0b090870cbed8536b6d1d406/File/zugawilagavazu.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/karaxojed.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/pagodoja.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0588b7c4f---zegimirekog.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bba057631---fugewipoto.pdfIn PDF document text
    • https://webmenuplus.com/images/file/67275597424.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160708ced4f792---52548890484.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/37307175182.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ba724f415e6---17005064646.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff3f4c74d9---mamufuteduvujadubo.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ee0db0587c0---jusubewu.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/r5ai2fvmf79csj8281cgecmrva/77539727202.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/bomovetasabufadesole.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f68a8360a2---nubinuto.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/e93e489fd4a46707fe62d9d76602e243/64171839802.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/bvt44ed8gmj0pco2oaufec1344/23687112622.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=mecanismos+de+transporte+atraves+de+la+membrana+celularPDF 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_off0000f130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF130 18332 bytes
SHA-256: 9e6d35c05ac7ce9b800d684255e03989dbaf2febd752b41377271de6b82820de
font_01_sfnt_off00011fdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDD 10972 bytes
SHA-256: 546c9350548ba6227dbeeca8ad2b07fee8d23e0088ec9a8370406caca464b6cc
font_02_sfnt_off0001391a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1391A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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