Malicious PDF — malware analysis report

Static analysis result for SHA-256 6302fa3d35f5436c…

MALICIOUS

PDF

77.2 KB Created: 2021-09-03 07:18:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 70e988dcba552bd5f9659164e56e8891 SHA-1: 41374aad239873356adf7f9e2e893712e1d928df SHA-256: 6302fa3d35f5436c979b6bce26d122231595fba523f3e461d5f7b90e43927205
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links to compromised WordPress sites and disposable hosting, suggesting it's part of a link farm designed to distribute malware or lead to phishing pages. The presence of a 'download button' lure further supports this. No scripts were extracted, but the overall structure points to a malicious document designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/26db0327fb043332f3e1ff9193e0ef14/46413295598.pdf In PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16089be11d8a96---pikijexidurel.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/16713522826.pdfIn PDF document text
    • http://grandparkoptimum.com/ckfinder/userfiles/files/76546311789.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/9b6974c57c2e87abc31eb63e04cc8611/tegugax.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/66999614545.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/47473100565.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083623c288f2---10454607203.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/98063637577.pdfIn PDF document text
    • https://koparieshorvathbusz.hu/files/file/12933733537.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/0e106b93b119997acb5d90e17c90fb01/7459164603.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/rajux.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/69665615715.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/73182781624.pdfIn PDF document text
    • http://cooper1972.com/clients/b/b4/b451ebb09e7e0345645526f893d9a49e/File/wabolumozuwokidufuvej.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3bd9435462---39403621775.pdfIn PDF document text
    • https://topupdana.com/contents//files/61065459141.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/dojitufezosikafokebutexi.pdfIn PDF document text
    • https://windsbs.biz/files/file/98920163097.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/45275244331.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/2cgk6c3ho39br4qs2auivgsqk2/82939885801.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/vuvewevirumisufapo.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b893e9497f---28591191115.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/86864679020.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baee9f718fa---vilifejefakuxelem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=arabic+grammar+exercises+pdfPDF 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_off0000c1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1F4 10820 bytes
SHA-256: b46bca9a049ad7864a2a5523d14da4678abdbd27f0550ded57c4a66c828b9957
font_01_sfnt_off0000da96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A8 20072 bytes
SHA-256: 63ceb1ffb878e3307b439257fef2dcfb60337db50cffd38a4438d7524f2ed16a

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