Malicious PDF — malware analysis report

Static analysis result for SHA-256 03bdb1307223c81e…

MALICIOUS

PDF

73.1 KB Created: 2021-09-02 01:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c58306c70b3fe1e482db928fbb4576af SHA-1: 2b3598812c46f2e4e0585cd6125d61f70cc23804 SHA-256: 03bdb1307223c81ed6cd806bb3b528c6819af1d87c622e5be895bc764b5d999d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF contains embedded JavaScript, which is a common technique for delivering malicious payloads or redirecting users to phishing sites. The heuristics indicate the PDF acts as a link farm, pointing to numerous compromised websites and disposable hosting, suggesting an attempt to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://golden-candies.ru/webroot/files/files/32749002387.pdf In PDF document text
    • http://adabaskimerkezi.com/upload/file/ximadenafuwiseg.pdfIn PDF document text
    • http://expresskaliski.info/file/sawilazu.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/65800684369.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/b0dddd5d35c2f01f363614cef44f0e54/23138665594.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/98320206417.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/79393832996.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/2ddbdfccf5fdb04775a3d4d470741deb/wabazanidejumepitoxixob.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160c7bf4bcf3e5---loleduziza.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/vc9uqu9uei2lv8grdujli8aj55/ragabegikaz.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609045cc2ce23---xolamuw.pdfIn PDF document text
    • http://viettincapital.vn/upload/files/lidazu.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d720a55be9d---mejisubodulevezulib.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/10565776468.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb57706754---57750730188.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/2d4ob4pmpqvfk7abi8r4f69nab/97189094406.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/98252948123.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/rvtvotkhp06evsq0ed3hgffk1f/gowofabadatajixezudo.pdfIn PDF document text
    • https://goodline.by/userfiles/file/74928786983.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3428d81f64---zuxuwesexadedijodopale.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/ekhlb2vqorfg0s4o49h069t4mo/82380682023.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/joloti.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/57641225723.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=pdf+password+recovery+linuxPDF 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_off0000bc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC3F 15848 bytes
SHA-256: 7e95138a446733986b963a053ec32f6e7d7e891cb908298f41adf7f9deb06dec
font_01_sfnt_off0000e50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50C 10984 bytes
SHA-256: 8c8454d4a08188de55c7af01359c501a8691bcc82ca53920ef443e41875f9d16
font_02_sfnt_off0000febd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1