Malicious PDF — malware analysis report

Static analysis result for SHA-256 652a943dae3ef63a…

MALICIOUS

PDF

79.9 KB Created: 2021-09-05 03:48:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 547759f0f1b22bae72a64f3a9fadb2a7 SHA-1: 95a411b45084415077fa1bb832d0937d9da0046f SHA-256: 652a943dae3ef63af930c8bdc1fa2a99536f2bb57587f05af812aa0a0443f590
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document likely prompts the user to install a browser extension or update, a common social engineering tactic. The numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggest a distribution mechanism for malicious content. No scripts were extracted, but the PDF structure and embedded URLs imply an attempt to redirect the user to a malicious site or download a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://pistant.ru/uplcv?utm_term=change+web+file+to+pdf PDF link annotation
    • http://progfin.pl/userfiles/file/nabemefikomo.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b610469fadc---gesaleb.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b9960fae3---judonufubafubovasaguneni.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/627a89b1641d3a8a6bc350eacb825fc2/toxikigorovenixagabuku.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/57193571478.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a7caaa5f5---veguvilowebewekelamajug.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/zoviwetufosidoviwe.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/a5bcbda9dc6c18730bff0a5406e1f1cd/duvutidufatepa.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/08f7e887f071601223bceb382ad3f1ba/76150544494.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/vatonagimot.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb021718ec4---gigidatolidifi.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/4ad3a903e501ab1943060017e34e82b0/rijanufeduzonam.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/tagivajimaruxenen.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/wevesutanomakapeje.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/35128230961.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/t98te1s356gkr8r20qrgkek50f/wipufisikalariluse.pdfIn PDF document text
    • https://soechi.com/userfiles/file/77099890232.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dae58ad24ae---muzinumusanatap.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/cc5obtk2moulf77da5tul6q8f3/61518469051.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a35997c4ede---89306343960.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/s7sgb0vbcajaeq2jdkh5j5ajg2/bejipubedoxipul.pdfIn PDF document text
    • https://kultmotor.hu/images/files/11088466615.pdfIn PDF document text
    • http://arlingtonhigh1959.com/clients/863184/File/37961421760.pdfIn PDF document text
    • https://example.com/source-image.gIn PDF document text
    • 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_off0000d4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F5 17492 bytes
SHA-256: 9356d5038ba9582a11d0c391d72a1e6157df1c10f54cc2dace1498a407007cc0
font_01_sfnt_off00010274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10274 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8B 10764 bytes
SHA-256: 142538f20b3eb784cfc1d154e22c4c66ddfd02df0b2493de7103557c654a00e4

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