Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb2a8a3e1d7806b7…

MALICIOUS

PDF

100.7 KB Created: 2021-07-13 23:11:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f7b485abf9b8fcd237b848bdcf462c12 SHA-1: 78c05f3ddd2e51a15edf54586539811bbc76ac07 SHA-256: fb2a8a3e1d7806b75d1bbc0b217d456cd0da6e6a63ae2a860d0a60a27a6776c6
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised websites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such sites for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9803

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://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/6mn3ileo81qnoude5b92jrq58p/36414918965.pdf In PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/9940701148.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/2308370292.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/0c3043dc1b62e12ddb0ce626d60073af/nevamalemuvi.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/jet476b0uf975knb8ud4225mk5/74213393367.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160aba24b61480---89636811588.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083cffba737b---muxugev.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c43f20c5c5---67907262308.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/29503940371.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607107595ce3f---37683036923.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abcbd131fa4---48954793931.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e844a65929---31963244540.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/75302132221.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/japutusesalajosajejiwes.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081dd5df3250---dewimodosegufuniwivezev.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/45209257977.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a2e5eaf57---kegewegu.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/lutizadabazu.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/07/files/210713193854.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/41002729241.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1943e5bbd---tixoxepudipigu.pdfIn PDF document text
    • https://nadamasristorante.it/file/14033624901.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/sulexuzuv.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072fe0421f33---jewavaduzudasijebowuz.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608364b35dc48---73054061601.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e2c07e04c---salawamokololapipivizores.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=formwork+and+scaffolding+pptPDF 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_off0001249b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249B 18496 bytes
SHA-256: c6a357297e452107b975c87b4fd77b88be3e284fb7cb0c4093aa126a1bdf6414
font_01_sfnt_off00015408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15408 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C1F 10984 bytes
SHA-256: f9bbb22000e7b9602158be7ac6a596e74ae97812955771de682fbf3916ec7784