Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5dfe09c1491e96f…

MALICIOUS

PDF

83.5 KB Created: 2021-09-05 00:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1e52f5d102c0d76bb17d132db7b39392 SHA-1: ffe8555783aa4c68074fabc7612c5a723eda4a90 SHA-256: b5dfe09c1491e96f130bfe5e5787a5e3f3ed5da7c3da24e1b8640966a3e7091a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting it's designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The file's structure and URL patterns are consistent with a link farm used to obscure the ultimate destination of malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/15d0fed9935e7388a3de5a86438d3f25/bizidodaxizo.pdf In PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606de63cb9e1a---52093225213.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5fe696e53e---korifirikisakururemetu.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a858ff1326c---97621658950.pdfIn PDF document text
    • http://goldia.cz/data/file/68810118686.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/2e50642247356e801cf1a608ede0fdec/wemewaxiwov.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607da636de80a---vigafosotepokimowasa.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/womisowedowinokelaguk.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090a45ee112a---80667449384.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/kuxaledisilaritusagabame.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/numuzixegebidalexagigidin.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/12187907446.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210809014813.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16100526f679b0---fijufegaledeseba.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/40582228132.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af1c7fd5b71---26222697001.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fivoniwimisefebuzegine.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/76717553160.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/bb5b6634243511ecda0528d58852daa7/50841735512.pdfIn PDF document text
    • https://halkapsikoloji.com/userfiles/file/76070541678.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160edf6ce39a03---guzonopepu.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/28884299267.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d42e4ecbc5---jepegiwude.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/82634967706.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=nomenclature+icpe+pdf+2019PDF 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_off0000db9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B1 18848 bytes
SHA-256: 5a391660973168eeb91dcb055f8bbb360becf6feed555bf4e616d3bbf6cd5d2f
font_02_sfnt_off000124a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A7 11152 bytes
SHA-256: d3ff38e977c7da8f80f633a9d052990a91b668495861a4019a82b10485b83dad

Open this report in the interactive analyzer, or submit your own file for analysis.