Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a682050d7fd15f4…

MALICIOUS

PDF

77.6 KB Created: 2021-10-16 15:35:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fa6dcbe9bf5ffc63ea4a3b082aa2283b SHA-1: a8ab1a0470e95e18222281c50d2d32de4c00d279 SHA-256: 0a682050d7fd15f426a9bd83cfe685e53fe2d950e4e4dda14c9662bd4de7a783
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The PDF itself does not contain readable content, but its structure and embedded links are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/161596e708c0cb---ditoxezudepaxunupotipuf.pdf In PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/dujozitifubebezotajatot.pdfIn PDF document text
    • https://giaphutelecom.com/tctt/sites/aaa/file/76573488639.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/sinisepavopabadupuxif.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/koputibipaxo.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/pulopimumizukulowaxu.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/dabirajosepasajijegav.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e5813ae74---73224579923.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/18899779283.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/586ad58c3ba4f77732f2232e2b2edaa9/27806862049.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/fesesinakilufutipulavakop.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/71611629448.pdfIn PDF document text
    • http://baocaosudanang24h.com/uploads/image/files/9196182745.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/9941834476.pdfIn PDF document text
    • http://isvpro.com/custom/files/xoxipaxulinuzavodilupofu.pdfIn PDF document text
    • http://thietbiytedaibao.com/media/files/79379042502.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/lonufifibedukivimikeripid.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/dixunuxufiwom.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/gugugegofokefawonuzowonuf.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/bimafajozixafilejoze.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/12762187588.pdfIn PDF document text
    • http://www.sctiec.com/up_files/FCK/file/fidonelemozavemaset.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/7xhmvLXWVJc/uplcv?utm_term=ratio+of+12+and+15PDF 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_off0000cabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCABB 10252 bytes
SHA-256: d109df522cdc07d9c55f2486d790a59004d82f05ea33cd7da85666a979ff1cfe
font_01_sfnt_off0000e20b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1D 18396 bytes
SHA-256: 327c8eb92e1d386bded6750897e3a23e77f4a97ad7affcf43790428dea14f9cb