Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a23de9a4fe069dc…

MALICIOUS

PDF

87.0 KB Created: 2021-09-21 23:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 92feb34d0ea8f7a3ecc7f89e676efba6 SHA-1: 0649dfd12c2c060d039e2d4b39495e2aee7f2bc6 SHA-256: 6a23de9a4fe069dce8c8987279f0fc212346ac918569fa251c3ba2bf814b4293
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV, which identified it as a phishing trojan. The document contains numerous embedded URLs that point to various domains, many of which appear to be part of a link farm designed to redirect users to potentially malicious content. The presence of a compromised CMS upload link further suggests malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crewmak.ru/uplcv?utm_term=phone+clone+android+to+ios PDF link annotation
    • http://oiseau-bleu-morzine.com/userfiles/file/54636320514.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/putot.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/23375869653.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613feaaf1c470---88109097655.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/ruloxovorivikofu.pdfIn PDF document text
    • http://infinity-c-t.com/userfiles/file/24723418625.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/9546687904.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab66d3f3bf---relogasafudifuxobaw.pdfIn PDF document text
    • https://norservis.info/files/files/kopajowevapejevopu.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/16709231152.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/67258082788.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ae9cce30d---29876473610.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/zunur.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/rufabezexi.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/jalafafep.pdfIn PDF document text
    • http://oodow.cn/upload/file/210905172001416918rw3ojtnrggvm.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/56586718487.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/86697325911.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/gosasiduxomo.pdfIn PDF document text
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/13865665076.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/39758566396.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/sonivitepavepodezitip.pdfIn PDF document text
    • https://rt9.rspo.org/ckfinder/userfiles/files/mokitadezogox.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_off0000ef0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001071f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071F 18136 bytes
SHA-256: 49c9a6551ad70f9b6a5ed7d9ecd7c7262c84c1928602bae4576cac79c1af10f2
font_02_sfnt_off000136ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136CE 10468 bytes
SHA-256: f176536cb7e7a8af4b01b0393fcf04d3efd25bd1e07f06006df9bb98cc4292f3