Malicious PDF — malware analysis report

Static analysis result for SHA-256 83afa11d598255f0…

MALICIOUS

PDF

81.9 KB Created: 2021-09-20 01:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 0de7a48902966ee174bdf994800d5ad5 SHA-1: 01116b7fb88c240cde7640cfa5a0fb4d3a3210e8 SHA-256: 83afa11d598255f08fb374f5782837b4362255f8822f56076473035c98265556
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to compromised CMS upload storage and disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140354958809---73611804525.pdf In PDF document text
    • http://akiisushi.com/uploads/files/dujafet.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109051705065508.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/24954294494.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/89629708443.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/14726305315.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/jisomogafebozupe.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/xonisezevof.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c26deb8a79---zalepamilarupoliketogeg.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/wopuzejarajawafes.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/8478268970.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/biwuvive.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/43658689583.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/56831346474.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/desokiraze.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///sumefazumikubudokibolivof.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/betemegobabajofi.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/86718917606.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/50666298718.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc90ea896d---54758166095.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/50182692248.pdfIn PDF document text
    • http://dolonchem.com/upload/files/bixipogolesasi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=game+alpha+9PDF 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_off0000dae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE9 10044 bytes
SHA-256: 1a17f54b53fc47717edf3eaec89d336bf0bf2b5e83f53e68ec8d3cd9ae86a826
font_01_sfnt_off0000f134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF134 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10946 18636 bytes
SHA-256: 0b87046071df459c831fb6c6832c20d3c6bd773eb3dc88fe40422424fc6d9192