Malicious PDF — malware analysis report

Static analysis result for SHA-256 59e9808a6ed9b7c6…

MALICIOUS

PDF

75.0 KB Created: 2021-09-11 10:02:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d625c5e3c37fd8348dd74c0152d921a8 SHA-1: 7483d4a2358f912af1b7dca846a111a54619b85f SHA-256: 59e9808a6ed9b7c68ba4a06f2fd672f9c148b106b600506a0d0c14a6e71dc821
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating it's designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple compromised CMS upload links further supports this. No scripts were extracted, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://garglob.ru/uplcv?utm_term=among+us+mini+crewmate+mod+apk PDF link annotation
    • https://nirkongrp.com/ckfinder/userfiles/files/nozosegiwabifizosod.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/8734933832.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/getibevalanovuz.pdfIn PDF document text
    • http://termocity.by/pics/files/16677897973.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/vuwipubivuzavasokoje.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/widenapexazira.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/xozexuwezuvidagopat.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/85381619979.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134511fe848d---vujiluburimapekamizonadi.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/90207120169.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/94410197894.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/12494465788.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/sovamobupudigaso.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/45747226083.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/29534779458.pdfIn PDF document text
    • https://trexanh.net/upload/files/leposawarozibiko.pdfIn PDF document text
    • http://shahgrp.com/uploads/pixos.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161329876def6f---16135601890.pdfIn PDF document text
    • https://malayalamfoundation.org/admin/my_files/file/91464344040.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/0fd29af634e8d190dafbaa1c0f5a0023/buvubesigosewebesof.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210901103506.pdfIn PDF document text
    • http://ccshecea.org/upload/files/domujerosorodus.pdfIn PDF document text
    • 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_off0000c071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC071 11068 bytes
SHA-256: 2918e5219419cd45334adf9cc6b69094458e2da7f6257ea386b36de1fac57906
font_01_sfnt_off0000da28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA28 16512 bytes
SHA-256: 4b2078e6944290da7fc555b338150117c6cc075a5eed1793b7f6162ac372ff0c
font_02_sfnt_off000104be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1