Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bfe605275d8c9be…

MALICIOUS

PDF

78.6 KB Created: 2021-09-05 07:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cf9f59e8780e6e0a5916f491700020cf SHA-1: 4e357f44a62799252aa580a02fbf8ab528791d59 SHA-256: 9bfe605275d8c9be967b93e77d9c4673b5248d6d0ed2c3f92aa00920c6e520c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting, suggesting an attempt to obscure the final destination. The presence of a PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that this document is designed to funnel users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://psfund.org/public/uploads/files/cms_files/52793425252.pdf In PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16071b476cf0ec---65246418791.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/58688720307.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/4691310935.pdfIn PDF document text
    • https://anfauglir.com/images/file/9147357159.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/medixotovafuxaro.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/55874589622.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a48b61efb4a---60583862672.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/vidatoz.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/98dd9181d11be281f315ea72d2671ad2/41924940138.pdfIn PDF document text
    • http://www.optimizecost.com/admin/ficheros_fckedit_subidos/25803504626.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/tifafisi.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/jchr5aju6ifbj9q3kto6hs61kl/nipekovewelebole.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/bejajujigokinusutuzife.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/wukavinikadumoruxudejekoz.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/aa0c1872763acebf60ef4cc18339d295/74538008362.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609a492f172e5---11792812126.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/63232476389.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/vabef.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/firusus.pdfIn PDF document text
    • http://reflita.lt/uploads/files/41857629120.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/94314711025.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966644e786e---55992631215.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=microsoft+excel+pdf+converter+pluginPDF 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_off0000cd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD27 10892 bytes
SHA-256: efbb4a378566ec68ecbb101335d134c7904b09df7ab81c784600cf66aaf55329
font_01_sfnt_off0000e652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE652 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE64 17956 bytes
SHA-256: 4b2ca486b833a76e32e653f3c49e94cc07cc1b5ce1bb8c64cd2fd43110eaa107

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