Malicious PDF — malware analysis report

Static analysis result for SHA-256 9483f2550ad8c01a…

MALICIOUS

PDF

83.5 KB Created: 2021-09-06 05:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b51dcfc0134031e6f16ef9afb27b673e SHA-1: b5aeb8e211f70cd4be49190a3cec3ded6c746bcb SHA-256: 9483f2550ad8c01a874b2108cbf29b5a6afefaa82c539d1474a1a9595a7ac928
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://cructi.ru/uplcv?utm_term=amazing+face+reading+book+pdf PDF link annotation
    • http://meteosputnik.ru/userfiles/file/benujelerusejafofikus.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/nupibarejijarovanetopax.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a87bd8e6d---fuzaboliwojaxabekovi.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/50623722118.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/n8er4rdq0pfe6cjund3j1k0ss4/suminoxuzutuwawubuzazuv.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/88263754263.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/9d263d2eb929ef3a0f3994213c4925fc/64189693725.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/2ac1b1b2f57d40930b75c6b39a71e02c/vejopufapepibato.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/23291553903.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607515ead7019---gidujizadonukevakutijubu.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com//ckfinder/userfiles/files/83712722904.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776df071385---61657597154.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/32951799966.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/71925953934.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/18359282789.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/wojina.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b46fedebc2---fefugolesewigididex.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210617020122_rw4l6f.pdfIn PDF document text
    • http://phutungotodungha.com/img/files/tufagavawirowakazebawi.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/womivajatozozixu.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/73191316331.pdfIn PDF document text
    • http://gujaratbusinesspages.com/userfiles/file/75224485733.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/gojusefurovigolo.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608193fe1f974---suzijafinogef.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/titose.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3509de3f0---77933568454.pdfIn PDF document text
    • http://bellsazshihtzu.com/clients/878694/File/lejojebelilu.pdfIn PDF document text
    • 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_off0000e183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE183 17512 bytes
SHA-256: fd3e23b1202217f606e5e67d28f6f3247b22fa1f249daad8f67d6403485dcb3e
font_01_sfnt_off00010ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF9 10924 bytes
SHA-256: 3665f2a3d59b2ec6c558fdbdc8b77254c3c64cd0d66d5c0c8ee727c32f1df1ed
font_02_sfnt_off000127e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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