Malicious PDF — malware analysis report

Static analysis result for SHA-256 97ef4e484e6ade05…

MALICIOUS

PDF

78.8 KB Created: 2021-09-20 11:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 579fdc858ed30bd8d372f635bc3a0461 SHA-1: 4d529a6d0a99f9e98b0caa85fe68d663fc0e8a10 SHA-256: 97ef4e484e6ade050156a369372c6bf5500de4b6f5c681e6ee44f51d3d139d7f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The file also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://jasz-pap.hu/UserFiles/file/bozerogegifanitegil.pdf In PDF document text
    • http://szentistvanpatika.hu/upload/file/defotekaligelupopesoduk.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/80143529484.pdfIn PDF document text
    • https://avistravel.activsport.ro/userfiles/file/53971396749.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/90714087691.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/didivakezonuzube.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/rukagijanopudap.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/dalugokejezesibuw.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/13535198469.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210914032046_1906513171.pdfIn PDF document text
    • https://techinnsrl.com/writable/public/userfiles/file/xoruniduwokinolanep.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144b5e3adab8---zipelagorobukomax.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/61209720314.pdfIn PDF document text
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/pamimuvazido.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/47555921269.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/bolinoxawon.pdfIn PDF document text
    • https://casaalu.com/luutru/files/tivuwakukikeg.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161474825b001b---90553236108.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/wameriposivexuragisi.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132692452c10---67651318720.pdfIn PDF document text
    • http://stl-hk.net/userfiles/94655260148.pdfIn PDF document text
    • http://dubossari.es-pmr.com/constructor/dubossari/ckfinder/userfiles/files/bekidibesazezokatemopo.pdfIn PDF document text
    • https://hklh.vip/data/attachment/file/37450781884.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16143a844079ac---rudepufubisojilaj.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/b34dd97f6d79c532f5fe9616f42e7f35/zulenudofu.pdfIn PDF document text
    • http://bdn10.cz/files/file/62047450427.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+set+a+video+as+a+live+wallpaperPDF 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_off0000d123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD123 10424 bytes
SHA-256: e64bc4f1b9d34ec72da9980e9f3db10ecbb7f7f8fba935fb580b36eb7664924e
font_01_sfnt_off0000e8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FF 16968 bytes
SHA-256: 37e0eb6f6181b6e686f1bcbb327f42cc573ae552141c0b2fd89cb19aed53dae4

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