Malicious PDF — malware analysis report

Static analysis result for SHA-256 27e31f45db9a3e26…

MALICIOUS

PDF

80.0 KB Created: 2021-09-19 00:11:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 98e5f29badc87c43060fb1930aad8825 SHA-1: 24b9d2cbd2ea5035549ff4118ad2f4741aea6214 SHA-256: 27e31f45db9a3e26630be9eb48e8076a8170ef836985c4c3006ea9a7479a417b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on distinct hosts, suggesting an attempt to manipulate search engine results or distribute malicious content. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://smidgel.ru/uplcv?utm_term=nemo+handy+android PDF link annotation
    • http://huefpdf.org/upload/file/5974287476.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/zotokoxokojatevenugi.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/xunew.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/sogazu.pdfIn PDF document text
    • http://twtqedu.com/userData/ebizro_board/file/48020422735.pdfIn PDF document text
    • http://freewest.at/83225195505.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/wubibisu.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/fedunovegopapofaz.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/35557486949.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/55641178988.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/889d51eb887558413713087edd487e00/81463234550.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/50648594249.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/sosakawofovusiwaremibarid.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/xafepasidibatagoj.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/1578607039.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/232a9ed96389bc096039baba8477eee7/duguti.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/posumofizivuta.pdfIn PDF document text
    • http://megalaserasia.com/upload///60358718765.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/14562165398.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161405b295dae4---wijakukube.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/32305699400.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/161350c6430cbf---67577771805.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/1057904464.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613af3fcf3db3---86991119581.pdfIn PDF document text
    • http://top-caster.com/userfiles/file/xumogivebavol.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_off0000d76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF84 10292 bytes
SHA-256: 61b3f13eca08569bed8f3485be4592c1bdd6806d76cbd6e9a50827874af8dc2e
font_02_sfnt_off0001066c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066C 17036 bytes
SHA-256: cdedaf09b4def1f9af71bb1bedf6add56b2ab909f445f55a73b199faf6e988ed