Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5afa9b071f5bdb5…

MALICIOUS

PDF

70.3 KB Created: 2021-09-26 10:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 49a40cafe2b630aecb824e41b3b76abd SHA-1: e6b6aa4aa2fabe1f03404ec41f781d7509bb4353 SHA-256: d5afa9b071f5bdb545f190e3727d58ce9b2a56179dba84f3712c1108a66a3e5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farms hosted on disposable or compromised domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the structure of the PDF point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crysiq.ru/uplcv?utm_term=android+show+battery+percentage+top+bar PDF link annotation
    • https://indiantalentjunction.com/milan/media/sejexovimeme.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/tufemurirasol.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/nulid.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/85811155791.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/4f4aa4a02b6fdc930e6598d708840470/48533825557.pdfIn PDF document text
    • https://rugsdirect4u.com/uploadedfiles/file/dowologobe.pdfIn PDF document text
    • https://milkywayads.com/webroot/img/files/niliputuvefe.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/67223276979.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210904125050.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1614d3c8a1d528---77267708368.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/texavixasoxelutasimi.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/21049633338.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/32657173125.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/83383840939.pdfIn PDF document text
    • http://greenflameenergy.com/userfiles/file/zinemozizalagotezak.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/rimujanubasunafoterejagix.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/17504537476.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/161456ab7cd2e0---gegarexifevimaxuruko.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/46239751490.pdfIn PDF document text
    • https://kimcert.org/E/file/20827769632.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/7159d9a9f647d6d5c4445ca831d242cd/79830626110.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614be6584eb1b---94159580399.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/rodegesaresevipisawiw.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_off0000aeb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEB9 11068 bytes
SHA-256: 3c57d0d66d8583bb6960d8c1368849f7fd8613f11ae708d615b21e61ea233073
font_01_sfnt_off0000c826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC826 17012 bytes
SHA-256: ceef255ba95c5d44bc9d9b3c9433d61bf41c346636eb6275a928d5dbf8a596e6
font_02_sfnt_off0000f393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF393 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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