Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8ea0ea695c866d2…

MALICIOUS

PDF

84.3 KB Created: 2021-09-13 01:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f099e2354c934d6760bbe22f97b455e2 SHA-1: 4d0d03f748f2a2e665d39ba2cef04df6541d4e4a SHA-256: a8ea0ea695c866d2e342f37f9f79eb3386e36c9bd825d243ac297c8cee1ae7b2
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated high maliciousness. It contains numerous external links, many pointing to domains identified as disposable hosting or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall detection strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://mtegl.wsystem.sk/userfiles/files/xejutevetalowulofan.pdf In PDF document text
    • http://lumieye.com/userData/ebizro_board/file/73396122555.pdfIn PDF document text
    • http://zhongyuemedia.com/filespath/files/20210911192408.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/42884459657.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/76290058518.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6174850bb---lukevogotepujolu.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/4092152058.pdfIn PDF document text
    • http://gdgom.com/upload/file/210906194833098856n0deatg8nxej.pdfIn PDF document text
    • http://support-cmu.com/filedata/file/pogesofodokojopisoso.pdfIn PDF document text
    • http://hueide.com/upload/files/biwugugiluzaji.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/majezusuxukepubilujinufa.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/82194165118.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/75e19fd1b682e5246ffe91f339c48d24/sunajutawuwiwopibewamex.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/87051736804.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/46637150824.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/84ui44amuem9iodtq9ddko2tl6/6440867255.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11078634778.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c60646d5a---jegevoju.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/zopuzulekenoruzozazosepot.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/zikoda.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/12026017165.pdfIn PDF document text
    • http://0575zl.com/userfiles/file/45468055559.pdfIn PDF document text
    • https://yourdentist.ro/app/webroot/files/userfiles/files/7562601096.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=android+exercise+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_off0000e5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E6 17672 bytes
SHA-256: 2ae71e6d6848ecfdfb761efbe966b9ea8934937031a865b44b3da5a90fa97a76
font_01_sfnt_off000113ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012be5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE5 10448 bytes
SHA-256: de5acbe9e3509dcd61184db360121617a70148d85a4d66f5f0efcbb6bb0d0ae5