Malicious PDF — malware analysis report

Static analysis result for SHA-256 d69957f019186357…

MALICIOUS

PDF

94.3 KB Created: 2021-09-01 06:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b25cc3e86b82d2a4ca2405a857074680 SHA-1: 8d7d42a7f57c45f11eea723b6f4a38051f9e5347 SHA-256: d69957f0191863572c8d777e9e86f355fc38e72113d9bb12be69a1a4b13b7ea5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, several of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/586d5lbpma4bnhgu4snc4u7mes/titos.pdf In PDF document text
    • http://seamacros.com/upload/file/wanam.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/fosotodabelejep.pdfIn PDF document text
    • http://dzbnf.com/upload/file///wilupa.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210702220055432.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/58482912858.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/35601522511.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/velinokemem.pdfIn PDF document text
    • http://kappp.ru/js/ckfinder/userfiles/files/73007134075.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/widepizotifugoputamama.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b549323b21c---79396159265.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/80997265200.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/80875713130.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083c4a349de8---xujurafatomuziximolosetar.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/67587479269.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/tilusumo.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/37715611149.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/32977736441.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/finodasowukabes.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/4582684472.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/loberitugozudavorowiw.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161286a27c2259---kalomuvexiwukebepawirava.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=best+chess+moves+pdfPDF 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_off00010dbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBC 17604 bytes
SHA-256: 35564815f57365b84e3f72dae271b6575f583b75de9c73b708453b34c3907d23
font_01_sfnt_off00013bdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BDD 10500 bytes
SHA-256: dd7e0b398dfc3df44eef0f42e96d550ae81b192f8be882e86a5b23291e31f87c
font_02_sfnt_off000153d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1