Malicious PDF — malware analysis report

Static analysis result for SHA-256 e20c54629d6fbef6…

MALICIOUS

PDF

100.9 KB Created: 2021-09-02 13:09:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5fe93ad6dffc5974e99f7ba6945a5839 SHA-1: 0f42b6af152e9e52dc1e42cd85f242caf33366da SHA-256: e20c54629d6fbef64b71595b98583dcee9d84c955e6a2043f28efcbf7d5cf980
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094497960753---64751921907.pdf In PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/be2ee7167105acdfabe7575807fbaeb7/8321278560.pdfIn PDF document text
    • https://tessuno.com/upload/files/60ee45bf69d9a.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/mivunag.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160851e7b42d7c---malepegadomojirowijelon.pdfIn PDF document text
    • http://sapaethnic.com/webroot/img/files/4474956637.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/2774646316.pdfIn PDF document text
    • https://olterus.info/contents//files/82540244044.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cbbe0d414de---xifonowiloruwamaji.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/sevasivike.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/72996283827.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/66466937440.pdfIn PDF document text
    • http://fruitvita.com/files/files/26206374657.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/15659495968.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a77b71649ec---69222818117.pdfIn PDF document text
    • http://peoplefineart.com/assets/202108/files/20210830175720328869.pdfIn PDF document text
    • https://2winit.com/Files/files/vilafir.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f60dd90f1a---motopapeponeburoto.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/69591897302.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083db77a4507---monofajozej.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160848074bfea3---53847425862.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=ias+pre+exam+2019+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_off00011ec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000136db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136DB 10716 bytes
SHA-256: c0ae88e304f195b5de319f0ccee4981e605528072e5f23b6e0d4d73cb2eeefee
font_02_sfnt_off00014f95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F95 20716 bytes
SHA-256: 95a4d893967acacb0aad2af89ef4bc7b0138679882fd3dd263ec6ac4a8f6068a