Malicious PDF — malware analysis report

Static analysis result for SHA-256 65ec51be0c19f56d…

MALICIOUS

PDF

87.4 KB Created: 2021-07-27 05:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bd15c739c8a8aea0860a5c3de9bfc27b SHA-1: c8b93dc3a6469f9f30cbf6dcd2234bc39b690ba8 SHA-256: 65ec51be0c19f56ded355714f630da6ff0919371365695860f208554fb469c7b
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to various compromised websites and disposable hosting, disguised as study material downloads. The presence of numerous external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://angkorphotographyguide.com/userfiles/file/vajuwoguv.pdf In PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608064eb26407---91744667604.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/2b1e39fc529e99cb3672454aa5917898/5224769875.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/13858512056.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/kimowomewimim.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/boroletonas.pdfIn PDF document text
    • http://dzbnf.com/upload/file///60203220968.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/nelivusarab.pdfIn PDF document text
    • http://hudsonohiohighschoolclassof1980.net/clients/7/7d/7d4b1ad73701457990394555a34ab01f/File/20517367826.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/37739729035.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/599a3cbd9d1890a438f7e41f683f6188/mixoxurezomunipososoz.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/81e2660d317a87f795e5473309773de4/96329867328.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/xufusawozonefatipawimev.pdfIn PDF document text
    • https://totounited.com/contents//files/nikavopoxumowunitujuzusuz.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/72875562397.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823722594aa---viligexumexivarijupotel.pdfIn PDF document text
    • http://rayanchem.com/d/files/81646122653.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/kopuz.pdfIn PDF document text
    • https://service-panev.com/userfiles/61566174018.pdfIn PDF document text
    • https://fid-data.fr/app/webroot/uploaderfiles/fexisibe.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c947007641e---43675009486.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/2p3cf4lrr2q0dtsg2allladspu/kewimapatikelidifot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=certified+fraud+examiner+study+material+free+downloadPDF 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_off0000f04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10860 17204 bytes
SHA-256: 77ee60cc9c4fd351c9adcd874e3785f7d15c6b7a9e56ef8e7809633cfdcaa486
font_02_sfnt_off000135a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A2 10948 bytes
SHA-256: f692327222f9d85f2aa08c7af537d98ac3fc8e8055e6d4ee0c155a14f7a8e17e

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