Malicious PDF — malware analysis report

Static analysis result for SHA-256 15aa25872a65c5ba…

MALICIOUS

PDF

78.6 KB Created: 2021-09-13 19:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4f09bb3820c4ad22d13684255d05c176 SHA-1: 3f77e46b19ca96cc0cc1b6223c870d58d13ee375 SHA-256: 15aa25872a65c5bab6cf26da64611196ea7d40cfbeda7cb7129636fe605f2191
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The embedded URLs and the overall structure suggest an attempt to direct users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pelletier-tp.fr/ckfinder/userfiles/files/62296011704.pdf In PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/v1gq06b4pknmo0jcdjp5argf9f/zakidoxisaputomabagebosu.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/50471303518.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/82017443076.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/bowiwururixatal.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/26358046473.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/79516621358.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/58806891399.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132ba49ee0b2---19682325261.pdfIn PDF document text
    • https://auto826.com/uploads/files/jejinojivafedafaven.pdfIn PDF document text
    • https://havilahbuilders.com/userfiles/file/tekaxogofabotufo.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21219356028.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/62690356910.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/73018286494.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/6e04e6f9749ddbe3fb629834006d4bff/mosolenavipefexu.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/10635226369.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090315130191.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/muxebofir.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210905_211945.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/st00tk9teq60h9s5s3r6kvmcil/10869872066.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/61253344331.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/jawakopiratebefinota.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/62949001825.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/96085592295.pdfIn PDF document text
    • http://abnicum.ru/files/file/babidasunosotuwezu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=arc+degree+formulaPDF 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_off0000ce5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5C 10440 bytes
SHA-256: 57a9cd048a5cb6def360b7b3ae66f8088c2197015c4765179e3a553b61a94887
font_01_sfnt_off0000e5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DF 18176 bytes
SHA-256: a8b68ce16f7befbdda4f00b33d53073c3c0d31d7574d400e1c718a3f59de9a9c
font_02_sfnt_off000114b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1