Malicious PDF — malware analysis report

Static analysis result for SHA-256 b28c567f443670d4…

MALICIOUS

PDF

80.7 KB Created: 2021-09-04 15:32:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cbdd23038352a9900fd9393e8d39f1f1 SHA-1: 7161c67e5867261100c25a12756aa4b70d648c48 SHA-256: b28c567f443670d42112dc69faa108fc437e9924a43a2f46d98d0193eac41a4f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links. The presence of compromised CMS upload links further supports this, as these are often abused for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://naphotelbangkok.com/userfiles/files/3132122169.pdf In PDF document text
    • http://botosani.ro/img/uploads/file/lumunosaziwuzesifadatesew.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/wexaxekomuli.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/78cff73cda1f2b84581f80fbea24989f/satenufunirumasilifotek.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/816b8f5208cfde2a3c1e333628d3edfb/setelijiborarawij.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/56115320004.pdfIn PDF document text
    • https://ovth.ch/userfiles/files/sulogavitafugowen.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/75703447944.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/rexivutobizenifinelabu.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/76368041638.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1627155486_9e17a61a1f.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076f1edf3253---nixuwanemipinijukepe.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608960b6c1eb6---81087402546.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/bc25aa9fb6b0735c94f02d29642d5eda/63723824095.pdfIn PDF document text
    • https://birotex.rs/images/files/96249194770.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/35677252631.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/9vtknn0rfbnp0k9pjqf3lcl1j7/78728744967.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/batovufolekodubir.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/ga1kbs3hjulo17rse6l7eok6id/guwupuniz.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/9a0cb65104f6bc7bf89ede3aedf10dcb/62956841907.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/1ab63e037a57af552195ff37d2f14e72/24026801015.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba18f4d44fd---gakiwagupofidifaxazan.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/badegemuwebifadorexod.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16076914dabf1a---45834012691.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/20694d6eb4835daad5d5559924991648/60574756868.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=ascending+order+worksheet+class+4PDF 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_off0000d97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97B 10884 bytes
SHA-256: beae7f6565fd6f9dce6ca259e13f6957912e7634ac0a9b9a82733c6450acab71
font_01_sfnt_off0000f282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF282 16424 bytes
SHA-256: 961f2795d3d4449ef3bead5807811b245e0c2669df33887dd92a2123c21b8527
font_02_sfnt_off00011cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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