Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f50d037659589a5…

MALICIOUS

PDF

91.5 KB Created: 2021-07-08 01:17:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 79a3758ff04eb141f271ffbcacafea77 SHA-1: 75e596aa0898f8e2d2324b1f884381dd22af14e7 SHA-256: 8f50d037659589a59c5defb3ef285c0c9c8341d7fc920daf74b90240d4c342a5
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous unknown PDF files hosted on various domains, some of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide direct clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://organicfertilizerproduction.com/d/files/97914769794.pdf In PDF document text
    • http://ilturismoinitalia.it/userfiles/files/kibug.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/widiwetufe.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/96825821275.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/vuxiforuwewuser.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/2769657859.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf70b39935---57777562997.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce56eb598a---24411200787.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/3fadef8685ab9b317baa541f4a4e1d36/kajelagejosud.pdfIn PDF document text
    • https://krono-original.vn/Images_upload/files/99712393334.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/41939089075.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-6///2021630103164693.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/77f038e01639c5d4c806093295c47752/70942727829.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/85ad7fc78efb693587834226aac298c6/65466865181.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/jupunixabi.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/7cc7a14bb0c0da689961fc2184529aa7/lizovojuzor.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/33678897695.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/69112050343.pdfIn PDF document text
    • http://e-hematologica.com/users//file/40407178869.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/57630721851.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/uhtgislh6q7fgj6mioeglhbsfd/xorowefetok.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc573179a5---75695730082.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608317b9eeeea---sekupusilaxekosugote.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=i+have+read+the+terms+and+conditionsPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CC 10608 bytes
SHA-256: 088a53a0376106f28dd59f6de3f8c9920ef4335c0e3f96a5346a679f4d4f6424
font_01_sfnt_off00011be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE1 17176 bytes
SHA-256: 84e1794f4a9b4d0a9839e15c7822b78bffe85122c65295ee906c4eea3ff82241
font_02_sfnt_off000148b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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