Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fd327c301660fa4…

MALICIOUS

PDF

69.8 KB Created: 2021-09-26 14:29:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4b43d9dba03b8a802be1c7d22acc4993 SHA-1: 258ef156b224023213400927eda8ca5da191f411 SHA-256: 9fd327c301660fa48234cd55c127db39d21ee9ae29de47a32fe440e72894d456
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hbaoge.com/upload/files/gusilido.pdf In PDF document text
    • http://wgadget.com/file_media/file_image/file/vibujope.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1614ceca6e2800---bikukewuweju.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/ramubafutivuzalux.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355c3393b7a---31181115541.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/lutebuxivezesisa.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/56870346935.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/34140029940.pdfIn PDF document text
    • http://dolaninsurancetx.com/customcms/uploads/files/wefamoda.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6a1ca2398---kojaxanokoxeziwe.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/dumifejosetukubuwa.pdfIn PDF document text
    • https://vyaspublicschool.com/ckfinder/userfiles/files/wuzomaxeke.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/2021917912294149.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/22056633056.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/finuw.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/12397231437.pdfIn PDF document text
    • http://casaperugia.fr/userfiles/file/matipagaxo.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/cnqajqqj5r70u6iheet17tp341/51887373488.pdfIn PDF document text
    • http://wujipacking.tw/upload/files/45433576660.pdfIn PDF document text
    • http://firegallery.ru/img/upload/wizisobojudidilezunivi.pdfIn PDF document text
    • http://lblussana.it/images/file/42119170923.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210926_78EDAA6A9E9914A3.pdfIn PDF document text
    • https://aspirans.com/files/file/78409821486.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=slope+unblocked+games+77PDF 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_off0000b120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB120 11024 bytes
SHA-256: 034cb40c1906e73be630aec90ecdff2cfd342e3f0d9fc8a00dd0193794a1de75
font_01_sfnt_off0000ca5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5E 15328 bytes
SHA-256: dacff8757541b8bb36c91747b2e706899406e3ce79bc67bbb3a364776be8f644
font_02_sfnt_off0000f16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1