Malicious PDF — malware analysis report

Static analysis result for SHA-256 28147b39d7b95b2c…

MALICIOUS

PDF

122.8 KB Created: 2021-08-17 01:36:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 90fdf47414d613b871c56fdbf2a1d7d5 SHA-1: c051c45416a76645ae26aae4b50dc0532af2cb51 SHA-256: 28147b39d7b95b2c8f7e2ab9fc722ca97f95045d2526cbad64c3b54523363ff5
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9838

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://ketchas.ru/uplcv?utm_term=batman+vs+superman+games+unblocked PDF link annotation
    • https://dejavuruse.com/userfiles/file/jukinujojuwev.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210729163157_941341996.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607a56e83cc05---86962190001.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/xijap.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/f1e6cf1720afe148cdc22304aa7dbdfe/60599103851.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9674922fa---kepusexukaxeziwulefolimow.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/39988955641.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/97693210183.pdfIn PDF document text
    • http://latexindia.com/userfiles/file/nefurovaradej.pdfIn PDF document text
    • https://afayl.com/userfiles/file/jabukasedazetira.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/webafixokegosugebul.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/3418b4bdf05479f3285b00baea94d003/gubexeligixuxe.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/25145d6fcb8b0c0fad4e24fdc4c03694/26097867519.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/pominolodutowe.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/v0cck5kiputj77pe4bauvjqfiv/46285976009.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/fed9471797e9b29a9d90a2ad1b18cbd4/77418430654.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/qlq33g5i8fmp77spffdlv8l9r1/dedariwelivufel.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609c429fcf3be---82322184998.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/97111895845.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090ca366bcca---xiket.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160767e3f3bd04---tarit.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/53083849202.pdfIn PDF document text
    • https://mgc.to/sites//web/upload/files/jozoniwifelawetejizazago.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/rilosomab.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012dea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000145f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145F7 6352 bytes
SHA-256: d270171da04306c12df8e886a5a9e19138e7ba0b246f576d12a1114a1d1ce6f9
font_02_sfnt_off00015c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C80 11216 bytes
SHA-256: 16976909aecc00f26ae21ab8dbd97b7f8a009af1d7910ff79c593b83b549ae89
font_03_sfnt_off0001766a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1766A 20704 bytes
SHA-256: 595d29a96c7a1b0f3b08d761296356946a809789f4ee399d6e0a580ec42da3c2
font_04_sfnt_off000198f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198F1 25120 bytes
SHA-256: 8ab99db124d8b2076054830fe759f3a6cb9417e6fb2af6e79d966495ea25ee5e

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