Malicious PDF — malware analysis report

Static analysis result for SHA-256 17eae9b1939590e8…

MALICIOUS

PDF

91.5 KB Created: 2021-07-21 20:35:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 38ff3abed70560776db9b5f56cdef676 SHA-1: 06c62f401ba40bbeacb9413a2a61e07436044518 SHA-256: 17eae9b1939590e8d7862f4c80e563b51d54e00f33b922a66f7ce54a8d268fe7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The PDF contains numerous links pointing to compromised WordPress sites, specifically within the formcraft plugin's file upload directory. This suggests the document is part of a link farm or phishing campaign, designed to lure victims to download further malicious content from these compromised hosts. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8bb2c6c08---74170841019.pdf In PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/zelijiwaravugageligomaj.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079b45584585---95794083517.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/tlk1ancgc8ait4d4nffjgc0cm7/magolawe.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/91629039361.pdfIn PDF document text
    • http://filatelianumismaticaumbra.it/userfiles/file/37826066267.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097f9d1afdcf---92639893806.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c4c370aa6---12756229493.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/43aid18ulo18lsablsk6asuoq4/23164197793.pdfIn PDF document text
    • http://vejwun.cz/images/18081560789.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1479b0ee6---xulatakema.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/b02e1658bd7bf40a250b6d912ab744b4/2867927569.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/popagumonizibipamivewe.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/sck0h4eaiilb3e5qcufimno418/kegajetixexunarizi.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/7640666222.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/23002338432.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6135299cea---83373480089.pdfIn PDF document text
    • https://tarsiman.ee/files/file/nonesabixa.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3266ef37f0---dozijitikuvevop.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/64819639718.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/lobewenusekuxewiranidexu.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/zigemiwefibopa.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/63559022990.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=red+dye+made+from+beetlesPDF 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_off0001055b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6D 16868 bytes
SHA-256: 6d26323b57c52cb85d2c6789d9751cd461a19f3ec707d511ff6543a05f27a776
font_02_sfnt_off000148b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148B0 10616 bytes
SHA-256: 7be6294525bccb62f55f7500ff9ec8b4dc46b9c22fc6c5ed7b82594f4d684a7e

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