Malicious PDF — malware analysis report

Static analysis result for SHA-256 84460958de2417fa…

MALICIOUS

PDF

91.8 KB Created: 2021-08-09 17:29:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 45918680e5f7247caf5a5ac6c140fc25 SHA-1: ed1249e6b54efbff6dda4243c41c8b52420e9b97 SHA-256: 84460958de2417fa60bc8342a8c0740365581bb0d47e9d7b878154a625f37ef4
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a network of links for potentially malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://chcial.ru/uplcv?utm_term=differentiating+position+distance+and+displacement+worksheet+answers PDF link annotation
    • http://czapla-dachy.pl/public/images/fck/file/44630433674.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/37823913850.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098e5cd881c4---55483944519.pdfIn PDF document text
    • http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/87528230702.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/nabixifukefig.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/10f1cdfffd01a932cec6395621c47b5d/22837754893.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/9661c8440b5d8f0da5a29efaf8ae4d40/borazurone.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/60974317975.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/gotaxejib.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/8f6143509ecfdf9bf25930e719a4836b/mebawirixoxeji.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/vekizenotonoreto.pdfIn PDF document text
    • http://suankaew.net/upload/userfile/files/61367634502.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9308940d5---rabevawusugipuwowegufufe.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/31745579742.pdfIn PDF document text
    • https://luminex.pl/upload/file/58726860473.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fd157dc88---29324647697.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4e7bcef78---logisivijomo.pdfIn PDF document text
    • http://woods-china.cn/ci2/userfiles/files/20210723174404.pdfIn PDF document text
    • http://artospace.com/pics/file/wetubelidulixobogosabi.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/xegeviwunagalevumake.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/tamegajuvukagot.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079613b4d822---xuvomajatik.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/a9796de39ab36b534faee57f0d721472/2448414451.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010cc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC3 17848 bytes
SHA-256: b98cf8af943f0eee339ee5782749fb12fb45887b5790abc5781dc8e1f9f64333
font_02_sfnt_off00013b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B7E 2244 bytes
SHA-256: 4c73c59f124b1a8dbe9ee13f008717072bd0f0f1fc2295589d07722dc1c24622
font_03_sfnt_off0001458f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1458F 11244 bytes
SHA-256: 0d79802aca29dd51fc330e4f42923d7b102753b2a70b05185764ade84ac78434

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