Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3dc017797e22a68…

MALICIOUS

PDF

93.2 KB Created: 2021-09-16 22:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a6f5573f305f85c7830c985001b21da6 SHA-1: 2bf75ba7e3784e2c6adaad9212cf136ad8cffd98 SHA-256: c3dc017797e22a68cb05b30115a7681e8661173758a49bd31d87ee2126fd7a2e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to PDF files hosted on disposable or compromised domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a deliberate attempt to create a link farm. The embedded JavaScript likely facilitates the redirection or download of malicious content, contributing to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://catamma.ru/uplcv?utm_term=after+book+online+pdf PDF link annotation
    • http://remont-etalon.ru/upload/files/xuxewowejufizopezomex.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/xitinunuj.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613887267a086---rubesoravemiganap.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/xobupekekereduletixidugo.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/65494458211.pdfIn PDF document text
    • https://maths-pdf.fr/ckfinder/userfiles/files/97303274029.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210913_AE8AE216A22AEF4F.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/minujisu.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/lopamuverozox.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/74766398774.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16132e688a50bc---nitogitow.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/xibudi.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/rolajite.pdfIn PDF document text
    • http://datcat.vn/2018/file/92333794778.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210903163067564742.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/71015147941.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/jisezoxikunebok.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/guxasosenurekarogagadegij.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/58427567707.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/90279202382.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/53881163009.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/5ac70d1b480e58ca9b5ba11960264b19/34313161529.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/669054814.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/97d62c92c7fdcd50ef7fc675920990c8/wezabadado.pdfIn PDF document text
    • http://wwsm-us.com/files/file/4654473686.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_off000103d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D7 10372 bytes
SHA-256: 49b24f83c76bb1589abf922f229d4693d206fee62ec569e3204d4029cd19ea1a
font_01_sfnt_off00011b1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1E 19896 bytes
SHA-256: 27d0a2c4af9b91bb95a20c0c6baa86910760d7df9e54075f018731ca3e8ef33d
font_02_sfnt_off00014ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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