Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ed02a115aee52d7…

MALICIOUS

PDF

91.0 KB Created: 2021-09-07 16:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3dcee4487c5e4277f1f23d96f6985a70 SHA-1: ef0f6902d28fc865ea66ee4aa30b2a47b47fc48d SHA-256: 9ed02a115aee52d7e724e6f9c5ae41aa3ac2a9eb929db95db871152036c73ed7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://cpils.com/userfiles/file/zifawosag.pdf In PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d26d8aeceaf---92306491388.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/tawofi.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/bakilesavoxanatati.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609dde1945a42---wiruge.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/tadowimitamexazekuv.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843f937d9bd---zepasuliwobureritoxu.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e53ea2a88---zugimewetoligivebezej.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/86108629774.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a1845c4af38---28722254631.pdfIn PDF document text
    • http://change4best.ru/upload/file/93159746902.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/71853245991.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b730b990ba3---88948417575.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/bikufexo.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109011525082887.pdfIn PDF document text
    • http://khanaphatgroup.com/UserFiles/file/48263925575.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/basopexutopimonajozuvof.pdfIn PDF document text
    • https://advik.net/userfiles/file/dinuxomakemar.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/xetibovebamezekomujezajod.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/63221132273.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/77107441944.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d8c0b6cd278---tatazuwupojefidukukura.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=chinese+music+history+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_off0000fe39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11650 10924 bytes
SHA-256: 0f95e95864ec55be711d16e520ab521e7807b18ae1cfa085ca33fac067f28127
font_02_sfnt_off00012f77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F77 18172 bytes
SHA-256: 5b8fd127c855aac35fe7cf3313726ac9ecec08c26a1d8ecdf7796c5b2f203e24

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