Malicious PDF — malware analysis report

Static analysis result for SHA-256 09045ea46b212eff…

MALICIOUS

PDF

79.8 KB Created: 2021-09-08 20:26:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a573908b3213e7973799f69350dbf508 SHA-1: f51d8bfe4c5540f40d1cf27f69bc4f072a15902a SHA-256: 09045ea46b212eff664335f10199838ed29fa298d265201485825e5a56e3a779
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute further malicious content or phish users. The presence of multiple links to potentially malicious PDFs indicates a coordinated effort to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://sakuragiramenandsushi.com/uploads/files/35835057794.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fdf9141fb---12947397718.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/6632e2dd912bdb6bb734b85992ca7487/mikexim.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161344dccc79b1---41867157938.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161332eb83d619---rebas.pdf
    • http://chemonova.com/FCKeditor/file/19338479960.pdf
    • http://yuli-china.ru/d/files/tukugutime.pdf
    • https://sportuna.be/ckfinder/userfiles/files/54353334332.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f7eb11342---43194604843.pdf
    • http://www.rpv-drachten.nl/files/file/45058616753.pdf
    • http://nbnjl.com/userfiles/files/43719340038.pdf
    • http://obasekiestates.com/UserFiles/file/46738840973.pdf
    • https://mokhalasati.com/userfiles/files/70772859747.pdf
    • http://www.cafeinca.com/img/public/contenido/file/61527998272.pdf
    • http://nexxstep.nl/userfiles/file/68839969792.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613130bf13675---zezerorekevuzevejafobura.pdf
    • http://poultech.net/d/files/40340096783.pdf
    • http://sipsak.nl/userfiles/file/piramasolisod.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161354baf24b67---tulexobujalaret.pdf
    • http://bedrucken24.de/userfiles/file/1713201743.pdf
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/31154523657.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/d72d75e31757d6f7a8b079c734587d6e/nosegijusujekiroki.pdf
    • http://gokea.org/upload/editor/files/4520480407.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=company+meaning+and+definition+pdf
    • 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_off0000d3c9.bin
ee0e821284774c45f581f48432ccf84b68524d2a6e244c18b28b76371126cc06
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C9 10672 bytes
font_01_sfnt_off0000ec11.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC11 16792 bytes
font_02_sfnt_off00010423.bin
76aecea36a199b381570a8c83e5a020ae21a9db3db1e7bfacbace8ac8ae6e2a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x10423 17568 bytes