Malicious PDF — malware analysis report

Static analysis result for SHA-256 62356dc709859797…

MALICIOUS

PDF

74.1 KB Created: 2021-09-16 00:28:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e32e1ad74dc1cc8e3091f8a36c942cdf SHA-1: 7edf147255f624c2332a779e3d2fd828b4baf606 SHA-256: 62356dc709859797ec14790764b875a65a40bad38a9f4ff5ae54ac01c563275d
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farms indicates an attempt to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://globalmediaminds.com/uploads/files/40515352362.pdf In PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16131bc528bccd---kofuzebubaxoboxufe.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161310e2de8e10---56276720162.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/wokaworegizuso.pdfIn PDF document text
    • https://tomas-music.com/contents/files/jafigevalupajiwiguxug.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/48611761200.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/21392482196.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/jiforutabu.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/57847772259.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/guzoki.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/pipijimuferedu.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e352db8c50---35091071767.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/pijan.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613405ecde964---67899312407.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/ed766783fcc08d7ca61e97f3bb7f25c9/9978500995.pdfIn PDF document text
    • https://granitnet.hu/editor_up/85591899873.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/jewudotugodemo.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/46796845797.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d61e9a7e4b---66572714273.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/rogurigakavimaxafaroke.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/73028554480.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/ruzolerogizotubajoj.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/tomutitoto.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/26787747401.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16138ac8895c98---bagenipeviwuxajiwida.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/21178609437.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=cbse+class+5+science+book+pdfPDF 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_off0000be2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE2F 10812 bytes
SHA-256: 9a67f6a8c29bddba65f2dd587a82e6d90c4162e0fe2436dfa14e55c556910087
font_01_sfnt_off0000d705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD705 16932 bytes
SHA-256: 28ecb82ecb9023f3efa95da7bd863e87cbe964638054ed2c0bad52d1cadc1f51
font_02_sfnt_off000102db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1