Malicious PDF — malware analysis report

Static analysis result for SHA-256 c296c0086bd8693d…

MALICIOUS

PDF

69.2 KB Created: 2021-09-29 07:30:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: ac967d715c6360b7bfa29ba8c13af096 SHA-1: 6dea7b588c59d3e0d9dca2e6135d28e2d289d7ac SHA-256: c296c0086bd8693dbcf2577530a76868a1cdcda7cb46c84c65717b17dc1292be
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple PDF files hosted on various websites, some of which appear to be compromised. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to lure users to download further malicious content. The presence of multiple links to PDFs on potentially compromised CMS upload directories indicates a distribution mechanism for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • 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://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352120623e6---75300536766.pdf In PDF document text
    • https://kocarbon.vn/luutru/files/ripiratedewesonu.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/sakigurisoxobanivasere.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/85236938566.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/60458212470.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/wivobelolerowenojiteturor.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/rujupujitubonesikumawer.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dda4907151---75309923501.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109241727356148.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e090857a9e---12235237434.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/wavorexazid.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/28935731563.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/83003120944.pdfIn PDF document text
    • http://artospace.com/pics/file/32930385989.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/wogusa.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161488bf1ed42c---91366011137.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/bepatifolu.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/34266600960.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/10124329215.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/pudawejivelivetujetip.pdfIn PDF document text
    • http://coolscape.info/images/files/vejoramuzi.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/a67783991b23e3e55c36bf22dbcedf8d/kapetapepem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=fnaf+books+read+onlinePDF 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_off0000b06e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB06E 10456 bytes
SHA-256: 7a684c8e4ba08e7b19b38086ebfe36b84a3709ecb9a9610b446303c1cf85af5d
font_01_sfnt_off0000c834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC834 15560 bytes
SHA-256: 1f3ffa2ba16fe2d580375a7b1016f7efe63f887232bec71a0587d02eb12af031
font_02_sfnt_off0000ef89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1