Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c32c115d2135914…

MALICIOUS

PDF

168.4 KB Created: 2021-09-23 10:58:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ae0dba2a8df7ca0adacddef773098e6c SHA-1: 6622c4d3fca8accefbc1de34d6dba2d837da1c6e SHA-256: 1c32c115d21359145c2740db73fc7ecdc1fdd9c3f9de338fc7e641da69db8280
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to disposable hosting and are structured as a link farm. This suggests the document's primary purpose is to redirect users to malicious sites, likely for phishing or to download further malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9823

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 https://nomylo.ru/uplcv?utm_term=html+css+javascript+interview+questions+and+answers+pdf PDF link annotation
    • http://imbirimbir.ru/files/buduvu.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/51467573177.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/nawadituxemisenopolufaf.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/96390945507.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/fopegedugubogumosuraberag.pdfIn PDF document text
    • http://wixoon.hu/upload/file/83112214262.pdfIn PDF document text
    • http://bilateralmatters.org/userfiles/file/gonud.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/65172355997.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/c0421820c8849af1980685cd81be5142/tobifupepadetupofiw.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/wonibiti.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/wexenegidopufusovo.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/40574043063.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/21936977971.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/72963317463.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/16100395658.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d3f8daad1---33247394945.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/femakakaf.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/32663061166.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/kirejopukosujawug.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e541aab1dc---firufamunavekowabawuzur.pdfIn PDF document text
    • http://krallarintavugu.com/upload/file/zatekoxibuzoposekamowo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00020fb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20FB1 11300 bytes
SHA-256: 6d4575034b8e72bf03aff7007c110c2a59987d4b37fd5eecf6a6b022967ad627
font_01_sfnt_off00022a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22A0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002421b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2421B 16632 bytes
SHA-256: e896d0c9c6509c93731645541c0836c845742b74f7fde2e8ff5e94baacc6a6a0
font_03_sfnt_off000259a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x259A8 21596 bytes
SHA-256: 95cb4fb2f77dafcbca379c3e9d661579f85e3a615bd503cba590a545e83917ef

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