Malicious PDF — malware analysis report

Static analysis result for SHA-256 551c5a606c53a3d5…

MALICIOUS

PDF

76.4 KB Created: 2021-07-06 20:57:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 95d1264b6ca687196370b55b565477e0 SHA-1: c121e2479cfcf1d1df64779c876f84263077e587 SHA-256: 551c5a606c53a3d541ea78dc86bdf3efc3f731aa84246cc52b6e948d8e6556c9
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 numerous URLs, many of which are hosted on compromised CMS upload storage or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL patterns are consistent with a malicious link farm designed to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.cylinder96.ru/admin/ckfinder/userfiles/files/fugobinoput.pdf
    • http://ilturismoinitalia.it/userfiles/files/83441193078.pdf
    • http://vimar.ua/userfiles/files/60797077472.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/80c0911fd98708dfeb26e74c6582f133/28477252266.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780d2c2b266---kafumigaxob.pdf
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/wilizegoxo.pdf
    • http://ducthoaudio.com/upload/files/92603885686.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e68557942---tesipazidofiwejitotura.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160919cf6a758d---duxodu.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4f93074f4---43629577456.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/45ca163c141250aed03855685d3a6cf7/lovixabidivonifabesi.pdf
    • http://msamerica.net/clients/873634/File/49979567136.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085c968537c7---wotomedagibi.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdffe617fd---zexukekuzu.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/39f3c6eb776e7e172b68508c71a46bad/fesow.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c151a0966---reromovurejojupazex.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/84792a2b88ca4da485154915b850986a/82078274058.pdf
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/67308551185.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607439ef47762---75949463010.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896d34b97b0---2155230753.pdf
    • http://elfuklid.cz/foto/Image/file/76126362763.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/4a8b8d91d40a005c53c85472cd248be1/diviv.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/e79ce1ec057c9379c3101a86d2525458/zanoguzesetiner.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/2rp16p1tmev7qjokmm6vggop16/96886388108.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=what+is+it+like+to+be+a+bat+thomas+nagel
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c83f.bin
9d4b09d8aa1c3db29d1be584ae233d63e9b7a62a33c674ea2dba8afda9a61b68		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC83F 17000 bytes
font_01_sfnt_off0000f3d3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D3 16792 bytes
font_02_sfnt_off00010bea.bin
6a0961905119ac7b04bde69adc5623ce304c723b81f5484d054456a0fc1124d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEA 10680 bytes

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