Malicious PDF — malware analysis report

Static analysis result for SHA-256 03ca8e261fb5c30a…

MALICIOUS

PDF

83.8 KB Created: 2021-08-15 03:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 22c826e2a9969d1dc3dd8f33e12251d7 SHA-1: 41369de00272f1f52f01422af5139a019388d3f6 SHA-256: 03ca8e261fb5c30a6fa01434403f3f977474c574e37ef0f62c147d931d786ef4
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm or phishing lure. The document body is heavily obfuscated and unreadable, indicating it is not intended for direct user interaction but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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.
  • 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://philabc.ru/uplcv?utm_term=which+shampoo+is+the+best+for+oily+hair PDF link annotation
    • http://hopkim.vn/upload/files/sovix.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/37041369888.pdfIn PDF document text
    • https://lesura.net/userfiles/file/rovokapunesipo.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/49c3c48939b4d4a47c8ca30b55da28cb/wibuvet.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a45e854e2d---31743322981.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/66691549586.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/34866965764.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/058c973c1c56a75958530aba09b38c4e/jejaziteginusedewe.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/1e1f64bae1f138e288aa7287871efdc7/4326458090.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/51042472870.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160881aa49eb54---gixenukurakazakaxuzumobap.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/kisipomusavuferefinoxoji.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/wabugazudoxosupibosowa.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/lafojuwebiw.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/e9aee333a8bfd6b2ccca6dba8fda1edf/67556490452.pdfIn PDF document text
    • https://spacio.hk/attachment/file/36809223681.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b951f6ede17---zotidekuzapedopaxu.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/2139b05b47gh131b1lm862jrrm/8109026759.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/16723333534.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/gekabusunaxinofigin.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/vomevevatuwizawilimilefaz.pdfIn PDF document text
    • 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_off0000e451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE451 17124 bytes
SHA-256: 5793711c058328390459fbf2c0440259c5a4a541f86a0fd10d10d815f5280b64
font_01_sfnt_off000110f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001290b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290B 10888 bytes
SHA-256: c4bec7b443ddafa717d012018c093f451b6cd95ce8a1e6583cdb9b6b2e4df629

Open this report in the interactive analyzer, or submit your own file for analysis.