Malicious PDF — malware analysis report

Static analysis result for SHA-256 c46ddc90b5ce6e3c…

MALICIOUS

PDF

90.1 KB Created: 2021-09-06 08:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 30a97d7c09d39bfdab5db1139830c68e SHA-1: 0f4fdc599e06280144017eabaff98995705c5d6c SHA-256: c46ddc90b5ce6e3c948badeb93f90e1b1aa5a0aac2a34480bb8efa904c22745e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or download further payloads. The presence of embedded JavaScript further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • 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://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c009fd2b448---mefelejezavabomudijul.pdf In PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0cbb498e6---vomamawovegew.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/mifes.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9c63ed3af---gofebakodin.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f146dd246f---68711359380.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/tekosikusesikorudutaxo.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/xezijarezomobiwu.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/77838353484.pdfIn PDF document text
    • http://boxethai38.comupload/file/78188946313.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/pejunike.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/da10a16be804c36904077c73a5b7f5df/bajixesodumalujugebo.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/sisonuzuwidubizeveke.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e880235b4ac---30402686805.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b838daee8e9---miwaxato.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/89541473661.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096e0a65b39b---76847328661.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/xisutasebulopur.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/32135952260.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/43313348412.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/63719734536.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=sis+act+and+regulations+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_off0000fa7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7D 10972 bytes
SHA-256: 0ab610623c2a8a5cfd45a22bd995d3ff4951ea4de2293c57d4607a5b92e81911
font_01_sfnt_off000113d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D0 18408 bytes
SHA-256: 514f1fb328988666e7a6b9183ab4eb4b3c970ff92801c558deca05b68dc27891
font_02_sfnt_off00014335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14335 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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