Malicious PDF — malware analysis report

Static analysis result for SHA-256 a66da0c7bc75054c…

MALICIOUS

PDF

85.9 KB Created: 2021-09-07 17:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9a49ea95446afcde2b2db617550da104 SHA-1: 41deb7e0a3dff64b29d140aa47bfc7f28b168a4e SHA-256: a66da0c7bc75054cea8342210e6f7f5c4bbf927072eee320fc5798a3d5a404c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=patterning+worksheets+for+grade+2 PDF link annotation
    • http://veejaytechnologies.com/userfiles/file/wudopexarak.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/5sddic55anuqhet2tkk0k2u3h2/tamamofuturolanezawafap.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6725dd9b8---govujebis.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098257e70ed5---wibesugopefixawawomil.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/82537631467.pdfIn PDF document text
    • https://tepihtrava.rs/files/gulegifuzi.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/49775780978.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/60183729576.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/gitilobuzinoxu.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/virasuxepofusoje.pdfIn PDF document text
    • http://usatovl.ru/upload/fckeditorfile/gifusifenaw.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/74278523388.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data//files/buwadometefitumi.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/gagokulo.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/bepofavodafodevutirako.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16092d61cb87ee---foborudexawamakuwusawina.pdfIn PDF document text
    • http://learningkey.org/userfiles/zelaboxokalefitimiw.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b7052c0d3---75835074672.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/95904972357.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/tufinijosupeforotilovudan.pdfIn PDF document text
    • 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_off0000ee25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE25 16548 bytes
SHA-256: f54b340c4d4a5946c96f65ffecbf3f70d002a78aada5231f9423ba69472d5449
font_01_sfnt_off00011932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11932 10888 bytes
SHA-256: ec969b23ab9075ad8f9dcc2236db54d76693f8b66a93808d24cd789f42b195bd
font_02_sfnt_off00013246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13246 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1