Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bcb099b1a190ff4…

MALICIOUS

PDF

71.9 KB Created: 2021-09-01 06:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 98d1afe7e3224306056b6d07003f10f5 SHA-1: d382782fe9666a265d96fb34f83d8bebcc332122 SHA-256: 3bcb099b1a190ff4c35e0ba74e9ff3c6d5673c0c41fa474a3ffed65d7fe9edaa
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

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://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161264c76745a8---79986912162.pdf In PDF document text
    • http://artattack-concerts.de//files/file/jopapawekarujisuxuwema.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/60300141600.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16109f94c57043---xusijuwofu.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ei123ru9920i694a2s0s3cm377/90557546108.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/dukusivuvaginuki.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607347263c60e---lumopikos.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/tisuvegomerogezojuxiwuk.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a634cb4b41d---fuvudekuxapuvivero.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/13963321442.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc3fcca3a9---40516383912.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/bigenojarov.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/10080644664.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/xedibanuvekizedipezatu.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/97345ee72bd87621ca3f0605ae8e6631/47133410911.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/a065164bfef8b690a461ae2a1883f74d/tovilunewetan.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/69897802346.pdfIn PDF document text
    • http://alexandraharris.com/clients/36054/File/4350534893.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d2aa13ecd---30160812391.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33443100440.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/69709072062.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/gibasononasegilef.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/eeae38062b51bdf014927dbfd205f99f/267284867.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/13010030084.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=present+perfect+just+yetPDF 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_off0000b6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6C2 10400 bytes
SHA-256: 7ae63c764dfafb5063049ab148ba754682c5cdbf88a669647b9fd8b90b221ac6
font_01_sfnt_off0000ce7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7B 16700 bytes
SHA-256: d007ad7235644c9d13a9a6fd83034495688a20958bed4b3fc64706138c134506
font_02_sfnt_off0000f84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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