Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff3a1ebe7756f45c…

MALICIOUS

PDF

91.5 KB Created: 2021-07-17 20:22:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 29d5fc52925a40d83b8f8027a1de138a SHA-1: 04dde2cd431482d65a40983beb7a13772c65a133 SHA-256: ff3a1ebe7756f45c2c03b50157390ee3b47515f6e468121169a9031ce5d618e9
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 by an ML classifier, indicating malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the structure and URL patterns strongly suggest a malicious document.

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 http://transsnabstroy.com/userfiles/file/76758232431.pdf In PDF document text
    • http://wisdomtours.net/upload/file/88511321874.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/sp7r9mmbugetltaoq0pnm03m9q/12293689608.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/0ck594uejc9mo05rgtv8fg3562/25522779161.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/sirovivofomuwolavap.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/55251916145.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/8479496061.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/6328167608.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/bulonijugan.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/3b225f7cc579e9e3bf28334e7e679bc7/17078675837.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0e59bd1ba---mepuvodurinam.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/5656721743.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/wazufo.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/rezabugebesozuxogu.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/b473b3572a427d68b00c8da7d2c966e5/nekojoko.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/76737704821.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608dde85bdb79---2512258175.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/25458701703.pdfIn PDF document text
    • http://rghsalumni.com/clients/82979/File/49760119879.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/peniba.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/71448655972.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160769fa40439f---80582714333.pdfIn PDF document text
    • https://nicosiacaffe.it/file/siperuvifove.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=calculating+student+loan+repaymentsPDF 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_off000102c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C4 11100 bytes
SHA-256: 5d9f350539a831a3de9cfdaff09e6416f8a002aa6530cab44c9860978c9f8812
font_01_sfnt_off00011c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7E 16948 bytes
SHA-256: 4e9a20b46521f17842a01c4326f9e848bfcfcc34ccc8e3562440a38276b95e97
font_02_sfnt_off000148a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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