Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5ad6a1eacd473a5…

MALICIOUS

PDF

81.8 KB Created: 2021-08-15 07:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8eceaefa62ebd4898725db7beea218ce SHA-1: 946677fdbd13ee221396e89fe358327b4a162dee SHA-256: a5ad6a1eacd473a55dcec193929579530db2d57585b48194924effe82c43bffc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous embedded URLs and link farms suggest the document is designed to redirect users to potentially harmful websites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://wastran.ru/uplcv?utm_term=opticover+ac1200+instructions PDF link annotation
    • http://cn-junsheng.com/upload/file///2021621231497201.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607921e6bdc9a---77538632754.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d39d9708f1---zobaduvofalanewonajakipi.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/5787263180.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/44619189685.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d6122b64821---83792742891.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b93008c25---98874562469.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/88489986912.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/43844565374.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/24233174439.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/a06f631f4a64272712ae25a2d974c3b5/kusizikotozufazujesukat.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/mipesudatowibelejek.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/31158481018.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc7611f245---bonujubenevimomejejiguf.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085263f5728f---95027917995.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/ledorawuj.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/33pp210234fe7a3hkp94j67v5q/77013113243.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086d7ff435ae---27917897911.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/7d121f2ab53cb530c5f8ab5865b3c77b/lewireku.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/somejulisumazugavefe.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_off0000d909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD909 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF120 10808 bytes
SHA-256: 694e63c08036dfee78decfd1b5d92a135d28607d07cddb12441fb5411881fc31
font_02_sfnt_off00010a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4C 17428 bytes
SHA-256: 40a4f793ba8279cf5d0fb3db02a13699f2ca3f19d987efe2f5f9ae44247b67e1

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