Malicious PDF — malware analysis report

Static analysis result for SHA-256 edf6f5c350f7a6fe…

MALICIOUS

PDF

97.6 KB Created: 2021-08-12 16:10:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7c3d05eb58dc0cc7760e33b39a6470e8 SHA-1: 0685cd5667e4f636faaea9ce014abc32ed498534 SHA-256: edf6f5c350f7a6feef3f297931dc5688241c42fe8c0075d3f3acd10d6aba42c0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO manipulation. The file's structure and URL patterns suggest it's designed to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://opsclown.it/ckfinder/userfiles/files/70721671156.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160ba459735015---84473928117.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/e9fu1sou93u2rukjsaud2dg7nq/6945743160.pdf
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/66552282550.pdf
    • http://rafaelokazakov.com/file/73765181709.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f846c8f298a---budurazova.pdf
    • http://ptaki.info/imgekoprojekty/files/supakasixedeguzemoxadibep.pdf
    • https://abouelhoulgroup.com/userfiles/files/boxopi.pdf
    • https://a2designbg.com/userfiles/file/71833841976.pdf
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/1341737075.pdf
    • https://tekmaker.com/upload/files/70350797211.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/bfe82b84784e18035edb66b6965c52e4/63801334635.pdf
    • http://omonetach.pl/foto/ilustracje/file/32319618553.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/471af3f7823dd9fb255a387e68e39d60/6798994997.pdf
    • https://eyetracking.pl/userfiles/file/94507587743.pdf
    • https://eccdc.org/application/webroot/userfiles/file/4220012337.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/jjdesm58595l131ioorng3lb62/86964212347.pdf
    • https://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210531060200.pdf
    • http://eia-edu.com/userfiles/file/3723820026.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b58dd00c090---wifuxewibajevevogije.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfa857dd7cc---sowalu.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e56f999c3c5---lobubenebidurifepuripu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=onn+full+motion+tv+wall+mount+32-47+installation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000117bb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x117BB 16792 bytes
font_01_sfnt_off00012fcd.bin
fc1bb01bc333c747bd57c8a02027bcc816059511239e4831535db819ee48284e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FCD 17192 bytes
font_02_sfnt_off00015c34.bin
e6e876516e5cf46057e5faa8ba273fbf5621b9aaba9cdd019a878457167a9d35
pdf-font-stream PDF embedded font (sfnt) at offset 0x15C34 10876 bytes