Malicious PDF — malware analysis report

Static analysis result for SHA-256 cede2cc064bdde4e…

MALICIOUS

PDF

81.2 KB Created: 2021-09-07 13:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b9e630eda1e4a5d9089a61fd46a51bf4 SHA-1: 28451929019031f715f4ab22bee74c5bf52d99a9 SHA-256: cede2cc064bdde4e6bcd96fbee1fafdc3693f49e8fd6e8e1b34c3feec1da22d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous distinct hosts, many of which are likely compromised or disposable, suggesting an attempt to distribute malicious content or engage in phishing. The presence of external URIs and a link farm indicates a likely spearphishing attachment delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://passaicvalleyclassof1957.com/clients/44362/File/8989882712.pdf In PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130cc52a03b1---wevenijipidevovojopisibe.pdfIn PDF document text
    • https://bnovum.hu/downloads/zitolobugofuxinug.pdfIn PDF document text
    • http://kag.fr/userfiles/file/8412366136.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/moritidelexuxerev.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/gufezesemokijep.pdfIn PDF document text
    • http://tcihk.com/userfiles/56804416111.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/nb47m1vhofleansdjh02ee5nn7/95198790785.pdfIn PDF document text
    • http://westboroughhigh76.com/clients/b/bc/bc4984db1d461a603911d7e4814e3e59/File/2677205891.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/21890167597.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b50fb89a4c6---25563520747.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a0ed87127---poxuzezedopilonoman.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e8dea22e---zilobeboba.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/43410779277.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/purisodafowi.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/70677423863.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/53309250426.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/pq5o2mdid4kp14ena3bniuu8bl/5783009676.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c848bee482---paboji.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/lenafepobizasesusez.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/79437737271.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9f3ea084e---16487382038.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/49093ec8e689679487c18cf24b543d6c/10095956206.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/oe82e9nn0f5jkftr7tq8k1fp6b/nasajugibazotimufizame.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/magupuxasov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=sa+akreditasi+puskesmas+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_off0000d589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD589 18520 bytes
SHA-256: d8a71120e844f88bbf4d13707d511c1f5d7c37d7c3c000ebc108e9d4d7d73010
font_01_sfnt_off00010652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10652 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E69 10656 bytes
SHA-256: f293b6e21c8521289621646b9b70f148fc3243be257781a407501be9008c10bf