Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cc8fcf2e46b3b10…

MALICIOUS

PDF

76.9 KB Created: 2021-09-26 07:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e35db792bbf2f8bbe5a47f1147993bc8 SHA-1: 4736cac3d3487378e61620cd905bdf42a331acf6 SHA-256: 9cc8fcf2e46b3b10180eab5cf7abadf508ad3e00b7d6b59d7666237b9600a386
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious sites or download further payloads. Several heuristics indicate the document functions as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://botosani.ro/img/uploads/file/babosagu.pdf
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/mezasivuso.pdf
    • http://selfmadefilms.nl/userfiles/files/tidegufamaju.pdf
    • http://giayviettri.com/img-ftec/files/wurokiwep.pdf
    • https://ags-car.60km.com/upload/files/rufavu.pdf
    • https://kovtec.pl/eurostyl/photos/file/63325909092.pdf
    • http://clair-environnement.eu/catalogue_dynamique/file/18799806675.pdf
    • https://xn--pssa17sw71b.tw/upimages/files/jexexi.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16146f5e59da16---67267967983.pdf
    • http://medicaldistri.com/ckfinder_files/files/tunejuxidemupewame.pdf
    • http://xinshifm.com/userfiles/file/zosaganebexuwijowen.pdf
    • http://spokoino.ru/i/upload/files/88330525800.pdf
    • https://ctners.com/ckfinder/userfiles/files/tefabodawuxazivitiw.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/235ac419db0522ead2b875affdba0db9/39155639857.pdf
    • http://guss-ex.de/uploads/fck/file/72908976126.pdf
    • http://chinajessie.com/seadata/data/uploads/img/file/163053778741.pdf
    • http://jolanyee.com/upload/files/202109110038329069.pdf
    • https://petpetmates.com/files/editor/file/gowunurasevigupidebixo.pdf
    • https://0924055971.com/uploads/files/202109231924187543.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161463128829e8---28319090569.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614c4831deda6---53944111532.pdf
    • https://kozhikodedeaf.org/admin/my_files/file/23549295984.pdf
    • https://al-wesam.com/userfiles/files/tejirimu.pdf
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/51033210764.pdf
    • https://gastrotest.co/ckfinder/userfiles/files/33393587964.pdf
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/mizuru.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=recyclerview+slide+in+animation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfe4.bin
3257265a4a67f3fe2dbbc0ca571d09bcc8b4c021e2759e5760730338a9fb9620
pdf-font-stream PDF embedded font (sfnt) at offset 0xBFE4 19492 bytes
font_01_sfnt_off0000f2e0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E0 16792 bytes
font_02_sfnt_off00010af7.bin
3748aa2c57f28fc980d955af021a9e4bb6a14132ce6dac70d6603187cdde059b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF7 10844 bytes