Malicious PDF — malware analysis report

Static analysis result for SHA-256 1788463b1a66f438…

MALICIOUS

PDF

82.7 KB Created: 2021-09-05 09:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6b5cc4d10ded9e4e7a23d57f5a1dafe5 SHA-1: 8ef20286e9915b1149af6d753faa2e4ed97b3b55 SHA-256: 1788463b1a66f438744c256f92693ae0b8c368d88dfd37ae18e125add471521b
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, characteristic of link farms used for SEO manipulation or phishing. The presence of these links suggests the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://noriupapildu.lt/ckfinder/userfiles/files/fokitezipifoju.pdf In PDF document text
    • http://tao-ssct.org/data/upload/file/11002302454.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef1a9eedd5---vilipozipimijamewazosa.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/90928075369.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/985rna9k6b7t3hchtsb86q96r8/dadagoramive.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/42818569675.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e981475392---85836036251.pdfIn PDF document text
    • http://flyingcarpetclementines.com/userfiles/files/93306827534.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795eeedd956---82990053687.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/70735565553.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160869ea259b31---96250049731.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/82446781397.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/c19bf718308278a607a588a823eb8925/tukipulijigofus.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/a048vkl5qoi2gbbviss00r5qsg/59673009074.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/cd69d8e1180584f57c0bb5686265d60f/raremedekurefenafa.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/wefipogiwegugita.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a949e6e8370---virawe.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f081be214e4---biximelamomodemanirutovoj.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/midukusamawuxuziwuto.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/69078037951.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f13f9261161170459edb693f5a5eb933/36650656656.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=scubapro+mk25+s600+service+manualPDF 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_off0000da21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA21 18412 bytes
SHA-256: 3d0034fcba99ebed5083e9be78529eb89e2cc1881f3a789dc902b457d521fc0d
font_01_sfnt_off00010a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9C 11456 bytes
SHA-256: 46fa335a60c50ed4c95ebcc843d6cbc36c94d8c8a3c6ca5ccb16c7c6ed0da5a6
font_02_sfnt_off0001257e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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