Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b0733ba3eb6d909…

MALICIOUS

PDF

85.5 KB Created: 2021-08-26 04:59:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f350d263e61ebb0e53af99593c2f50ad SHA-1: e4ef00f4a4efb2b31ea0501b5378bdb1e20210a8 SHA-256: 1b0733ba3eb6d9092ceac1e819bc5f581b73b7efd7fe4d20f58d3be8f37059bd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The embedded JavaScript may be used to facilitate the redirection or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://favorit.pl/userfiles/file/rawexaxojutolemudodul.pdf In PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c6020395005---gawuvopu.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/pasakunodipisejakeji.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/feseradurevire.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/8b0706bbc2aab9d9230c06bb11d56f11/zajof.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/ranexezebapanizibokajigo.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/5ca25cde39e8840706f6c08f6fe4754c/35228968210.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16075520fea744---pepazijipuw.pdfIn PDF document text
    • http://webdulich.com/js/ckfinder/userfiles/files/55624210741.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/zovinobegolojana.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/5711729012.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rmq39pd30v1dk6v5jrqoh21os3/95968255007.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077b6e409c74---zabuvekaziboz.pdfIn PDF document text
    • https://invest.pl/userfiles/file/tabagawuxokeketegerav.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/vekeborujibakegu.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/67282579548.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126e6772876e---97639467428.pdfIn PDF document text
    • http://accronline.com/userfiles/file/26801524097.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/78112069090.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/50ea7jogt0cq6urpc5jahjus27/46263153772.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/givaladitusiriwomuwen.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/gotosuxisaxotifitipelap.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/2cf45bb5315b606a02bd8634b71c61c2/fusoxegipexiwizikepipime.pdfIn PDF document text
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/a4c956cbda4327336fc87b3fd3b32459/visuzakog.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/0c2ff354872efc9e55fedb923464ceb1/77893485489.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+hide+excel+cell+linesPDF 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_off0000ec65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC65 10384 bytes
SHA-256: 2f04aec6b87e957053b11526e3f378f6f466f3a11afc264dcc14083491a55f01
font_01_sfnt_off000103d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D2 16912 bytes
SHA-256: d9e70b3e00d676347d8065ded2a25176bfc3c4084739e4f53f829684befe43e8
font_02_sfnt_off00012fe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1