Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cdca47c90cd1613…

MALICIOUS

PDF

76.8 KB Created: 2021-09-21 07:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 10e6eaac1a691336ffbb010384dde018 SHA-1: e14ed17056ed3863da723ca74e8862dc2f30b526 SHA-256: 3cdca47c90cd161327a881415543bd386f81c7ae6b64f85b758b1602c658af4e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous URLs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document functions as a link farm, likely to direct users to malicious sites. The embedded JavaScript may be used to further obfuscate the malicious intent or facilitate the download of additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://daaeportrett.no/upload/file/pusapomefopodavofigugi.pdf In PDF document text
    • http://sin-hua.org/userfiles/39649338659.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/lezonarerujanesogik.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/wotujojesaledariru.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/saxumutixeza.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/59f80b90a3efd0e6df0c052eeb06afff/17050595125.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/84361099766.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/64776089314.pdfIn PDF document text
    • https://majubesar.com/contents/files/83262778712.pdfIn PDF document text
    • https://breedlife.com/upload/files/wanevujededitub.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/2996063190.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d53396be81---82769935721.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/56091270040.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613947348dda4---78318986077.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/23314987081.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/74873078948.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/97156654361.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wokegux.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422a0ce9158---70027469734.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/84871692723.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/39441343081.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/41792592879.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/gifekevurajufaxedoro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=stb+emulator+pro+appPDF 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_off0000c8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C8 10364 bytes
SHA-256: 0cc581bed3b1c855ad198612a0dfb279e0a3f23927918595ee7ac585fdc2b259
font_02_sfnt_off0000f805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF805 17412 bytes
SHA-256: 3868a23ada06318425de38f3db7497f5788eebe8104a88110a2240d0f2cacc38

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