Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe850e4f82ade8e7…

MALICIOUS

PDF

90.0 KB Created: 2021-08-10 23:05:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 30b1d7ea1cc10850fd4ca629ebbb62f9 SHA-1: 86b723b0d04d93c4f7ac01dd06840e998b87c4ce SHA-256: fe850e4f82ade8e7f08e1fda3b81f0231ebfc01374795161e1088e2a409fc9ee
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories and disposable hosting. These links likely lead to further malicious content or phishing pages, serving as a distribution mechanism for malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/1b76399d52cb8af576a4fd913a0a5013/62651066127.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d81937c5b---10075184860.pdf
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac732ead022---62506339862.pdf
    • http://dsagco.com/Upload/file/togudalamosunivogup.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fba90ef118---mikapipukejakizutato.pdf
    • http://icltindia.in/userfiles/file/69495129287.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/amvam09tsrnlbngsiej70lf6sv/62339048118.pdf
    • http://www.greenfield-sustainability.com/images/files/37684602227.pdf
    • https://usdcp.jp/user_data/userfiles/files/66354772037.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbc7bac291---60918771940.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/2fd513ed56b58286b9b214e1a01f1713/35362635202.pdf
    • http://upservice.expert/admin/ckfinder/userfiles/files/vurejanedejozinolofinozi.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/ji9j3k49conoiuq8f7811dgef3/mizevudadulitufaxuva.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7342a44d63---vufirejudezuxofogepafo.pdf
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32017638241.pdf
    • https://debo-fit.be/userfiles/file///26755139584.pdf
    • http://deurenhanger.nl/userfiles/file/norogutoweta.pdf
    • https://www.bosingels.nl/ckfinder/userfiles/files/veram.pdf
    • https://kermanrooz.com/img/files/29761033912.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/2889b9f74bd6c9283f5b2de83ff0e606/22290163990.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/73e031d203cd45e1e9c3abd87edfca26/72998503530.pdf
    • http://fluellentrees.com/clients/58222/File/6583667705.pdf
    • http://ugyvednok.hu/userfiles/file/46081244608.pdf
    • http://robertfeinberglaw.com/images/edit_images/file/50855135109.pdf
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/4b4f248cf84c95647b314f5a9b013810/23484721118.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=what+are+some+interesting+last+names
    • 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_off0000faaf.bin
d9e3e6f78531f90b5cab73f88fcbcad55a57a55c765e48768c9bfeaf9637f30e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAF 10548 bytes
font_01_sfnt_off00011295.bin
09e2245481d4223e4ac3d11dd46635ef32004e672e5ad87516eb97f54e17cc46
pdf-font-stream PDF embedded font (sfnt) at offset 0x11295 18680 bytes
font_02_sfnt_off00014255.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14255 16792 bytes