Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffc455619c06428e…

MALICIOUS

PDF

70.2 KB Created: 2021-09-28 20:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 188589e0fc75904c74f633745786c857 SHA-1: 5919f2131b69cc6cc5347638243e1be25957c90d SHA-256: ffc455619c06428ef07b5aba091798c9caa9fb103568e4527e14b49391bf3b20
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The document body is unreadable, but the heuristic firings strongly indicate a malicious intent related to URL redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://drafthe.ru/uplcv?utm_term=five+letter+word+that+begins+with+c PDF link annotation
    • http://gelikonline.ru/content/Files/kaxazotezulamojitusamimov.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/gigujotofesadezajoporisir.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dokutazadiwizebusonu.pdfIn PDF document text
    • http://unityproductions.com/upload/files/94210848145.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394f368f854---27440822603.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/71514328069.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/70355744254.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/79310881228.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/481d199d1b3b47c4481211faf35ebe90/21344738164.pdfIn PDF document text
    • https://interangkorcondominium.com/userfiles/file/78339594239.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/52992578724.pdfIn PDF document text
    • http://freeorden.com/media/file/40418211456.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/rarifamoturalewet.pdfIn PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/27945393586.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/jadarixesokibixezupidet.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210909_9F531829909AE50C.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021092100124473499.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/jofebijulajomupow.pdfIn PDF document text
    • http://tid.vn/upload/files/70729864330.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/rogolitikenigopuvuwadiwa.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138eabc3a48b---jasiguraroziriwa.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210916_08506B44401E93F0.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/5c975ecbd41c6a751951ad1e4332f753/51346330294.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/2tvshiroii09sdopvp5vktuvh6/ribovijijetilatofuzomuwak.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/72382762867.pdfIn PDF document text
    • https://rt9.rspo.org/ckfinder/userfiles/files/86142530602.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_off0000b2cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2CC 10916 bytes
SHA-256: 21d3868b16a054706d576743513b57ae9015896a022305d0a2f91418e4885d04
font_01_sfnt_off0000cbd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EB 15360 bytes
SHA-256: 9b6bf0e6452c8592e208c7d9ce58270057fdafb4e1c312686af091e37496a949

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