Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bb67ab3738b61b4…

MALICIOUS

PDF

75.8 KB Created: 2021-09-07 20:26:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 172199a57f3de6f89426a1df09c565b3 SHA-1: b92338976d79e5ae58ccdd77bf000fceac755ab1 SHA-256: 4bb67ab3738b61b4fdc541f1c6d2db9c7bff16d8af33811914e01bb28d39ed74
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites used for hosting malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users into downloading further malware or engaging in phishing. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/715787b26aa980b7e8053c27b98445f0/85679084325.pdf In PDF document text
    • http://www.celso.org/download/kebuxegowufabuxokijo.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161255721cc1d8---62849915951.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/24254596066.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/789f9c037d72f9e4a7c94a2bf979d2d6/dokafufebizawizaxi.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/gejefejepobixexagek.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/7llqrcc4462t61h9cbtl5gvlmi/mamiboxariburasisufekugor.pdfIn PDF document text
    • http://rayanchem.com/d/files/gejibagaraw.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/zavaxotokoliwazak.pdfIn PDF document text
    • https://maturana.cl/upload/file/88207621777.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0cff3a940033e2df72110ea8ce23d5f8/romajaxezibosewubipogo.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1609c46e0a4f04---53232933317.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/xasavokinevuwetivor.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b51c8cdf281---75197826894.pdfIn PDF document text
    • http://smn68.com/clients/75339/File/59799329686.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28933291344.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/22270340970.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608acc4bed48e---newovebo.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/97ho85kldfvsnqp7hm2a2u072a/dokidizeriziju.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/81ec8504994a8e895ca9d15395bd4476/96287610977.pdfIn PDF document text
    • http://suaups.net/userfiles/file/wibijobitakosepimodonas.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/aq4cdutq2kjol1lqnjd67lgjpu/datis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=chorinho+pra+ele+pdfPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/a6984c4986f6619f8dbe2cf6da4caeea/41399767072.pdfIn PDF document text
    • 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_off0000be1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE1E 10360 bytes
SHA-256: cd2879adbf1fae1a6feeb25a2de4b046c35cda86f5d8760e980d9dbb58adcf93
font_01_sfnt_off0000d560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD560 20796 bytes
SHA-256: b2c2f4b944a5487b41e5a20a9cd7ea6fdad9ee8c408e6161dd1eedcc77be7865
font_02_sfnt_off00010993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10993 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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