Malicious PDF — malware analysis report

Static analysis result for SHA-256 50b9c47777fe4a3e…

MALICIOUS

PDF

86.6 KB Created: 2021-06-26 09:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8e1f46dae930ba084149c5d2de3201cc SHA-1: 9a0b2b32961c00a435b3b0dc112a5daaf66fbd2f SHA-256: 50b9c47777fe4a3e27e0a049701659dd71849a22ce36b0e8d9e4f779e114e51a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload storage locations. These links likely serve as a distribution point for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af8690f3fd---2340582440.pdf In PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/fa43399a2f7e07da14a240195491f5fe/sexuripevapubenomuk.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/pufasazoma.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608acde4bf061---velamirij.pdfIn PDF document text
    • http://khochailo.com/upload/ck/files/65028919065.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/93315071811.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/xasonogeporodalideforip.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/kunekoluz.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/xuwariluxifipuvize.pdfIn PDF document text
    • http://asustainable.com/global/file/77916024258.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607db7d3acf6b---vesibiwagunizij.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160938d665d2f2---62161426464.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/8e454c50d3c29bfbfa0a8d4aef108f2f/65939648975.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/83380030411.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/58831220426.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/ad670e847197353ee2d58197e26b9768/70897997207.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/2i0vjkp8pru6phqjt0p05r6s61/17873767482.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae72ba85064---37552136683.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b672c2277b2---58773648607.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/7fb4667154854fa30cd3b7e6a62be659/finudolaz.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6b33b0542---37559915859.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d393214359---tasaxovozebavugitodof.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/xeburelara.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=what+types+of+particles+are+found+in+the+cloud+surrounding+the+atom%27s+nucleusPDF 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_off0000eb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6E 11308 bytes
SHA-256: 7d664755aa9930f67ea732050ca50ddce18f49646b9e5d90260c85373b0d36fe
font_01_sfnt_off000105ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AE 17540 bytes
SHA-256: dc7c2b437e2e5be6dad2705bc77ce4b7f9cd6dd36bbd6e7638e3902505980c38
font_02_sfnt_off00013402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13402 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1