Malicious PDF — malware analysis report

Static analysis result for SHA-256 f42421126020785d…

MALICIOUS

PDF

85.2 KB Created: 2021-08-23 10:42:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a7a662fad55e0a467dc50555b0f029c0 SHA-1: 6129eab017e3f3b0d1966a285ecebeb24c1c1c5d SHA-256: f42421126020785dd80efcd303744f68e43c3711b4023a7dd20091ea312730e2
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits a vulnerability or contains malicious content. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous links and the nature of the hosting suggest an attempt to distribute further malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://kolasinprevoz.rs/slike/files/japomokugogebu.pdf In PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073bb8145190---didizebatizotusunevoxoxa.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/dibufimito.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/55606109488.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/llu6tb3e8ro9kjito046ssv16o/gipobika.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/29483247149.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/xorasosefatakojewalipo.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf692f02b9---penugigaluwibirojavu.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/90485909375.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/juwufirojefibopexetepe.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/94066853233.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/wedawuvegopikegixuzowe.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/dukojeliwojunixazaxarodi.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/54628569661.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/sjc4vde4j596vs0lcoq2stsdlt/lukitajopev.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/86776274779.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/runuxejam.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093277ac68a4---mifosudamok.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/161110d6712b54---wofituxipukazisejasiwa.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/momofuwonaniganukax.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/faxebalejenuvebugifu.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8d7b271552---52564697759.pdfIn PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/55268728357.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c475a9d4a0a---sipus.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4537a9572---gazexubebuvowol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=good+governance+and+poverty+reduction+pdfPDF 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_off0000e492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE492 10900 bytes
SHA-256: 818a23976d95d0e23550acb286597fa0ee8c2d7b1c916187e55fc55395303b3a
font_01_sfnt_off0000fdc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC6 17492 bytes
SHA-256: b948b3581ccddefe2c20ff86b3afe2e001e1814c545a6e56eda837224e02dd70
font_02_sfnt_off00012b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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