Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ade484ef16bc8da…

MALICIOUS

PDF

82.4 KB Created: 2021-09-07 16:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9999351a8411774ca4b6277b317db447 SHA-1: dd8edc39e5dee9cfdc5d461bfa037f9e1bf49beb SHA-256: 9ade484ef16bc8da2d35327c0b18e8f8c1475d4f466fb1657ac234b537c03ff4
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised CMS uploads or disposable domains. This behavior is characteristic of a link farm used to distribute phishing content or malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://sun-dr.com/uploads/files/202108200319296607.pdf In PDF document text
    • https://1877painters.com/FCKeditor/file/timasijusowelederekibazo.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705d310f325---mifedolor.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/97918853255fa3655e6e2f042ecea246/wifebowovibejubulonopura.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/16617246582.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/xedekeluzavolabuxufaderat.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/2e4c5e1f023184573b7001cc8f78badf/juvat.pdfIn PDF document text
    • http://ashioke.com/images/library/File/tujopegowuxibe.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/bigefovometufujifoju.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/tasepamanexula.pdfIn PDF document text
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/vulobebogomanebowov.pdfIn PDF document text
    • https://olterus.com/contents//files/72539975001.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903ab7a8523---3941468997.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/a6398f273a7c23fbe3d0005dcd2dcc6c/11354886154.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/11581867669.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160916bdc16785---kikutofaliso.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/lobekawip.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/77420624626.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/17965187960.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071a0a8ec212---37419705240.pdfIn PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/xudogiw.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/fc3tn8kqeed46sb326r4q10dle/geraluros.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/16015176921.pdfIn PDF document text
    • https://kuepancong.com/contents/files/bizumezupixukebijemexemoz.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3a1c2fdf2---netoxiridimujojubojet.pdfIn PDF document text
    • https://dm288.rs/slicice/file/lugaluwikidewupujipisid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=precursores+del+humanismo+pdfPDF 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_off0000d57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57D 20832 bytes
SHA-256: 000b8cd9353fdd2dad7a4a6aaca3bab2553899e33b2388d03fc5e5bebdb84717
font_01_sfnt_off00010ac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC3 10888 bytes
SHA-256: d6aab008926b57d93e8a9c86bc44cef65903b0679c687d6cd8491230486f61c3
font_02_sfnt_off000123af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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