Malicious PDF — malware analysis report

Static analysis result for SHA-256 d300c0fc11bac72a…

MALICIOUS

PDF

82.1 KB Created: 2021-09-05 22:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c33159f6b853169398e5e8d0c0564b98 SHA-1: cdaba3fe7512b8a7e9a5be8a936487345fbabef0 SHA-256: d300c0fc11bac72a0b309acb4e623a4e015e5a8880966cbc642e20fab8089762
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. While no scripts were explicitly extracted, the presence of numerous external links and the nature of the heuristic firings suggest an intent to redirect users to malicious sites, likely for phishing or to download further payloads.

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 http://epmachine.ru/d/files/22803310132.pdf In PDF document text
    • http://hoangnamjsc.com/upload/files/juratafigezebeza.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160965dedbfb20---dipabakujumed.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/lemet.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/5e390954d4c1ebac255f3242b9bfd34d/62832916603.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/77744581913.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1611f2a2b0f4c6---wuwevi.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/navanakuvuwezojakabod.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2d8a704c6b---34734056269.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/xadilugifimevibovaga.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098337aa7264---nusubomuwixemem.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/1bc1631be7267ada8d8dd8cf46c415c1/4457885300.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/gogisenonexal.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084691f7064a---fopoxufavero.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c3af003d186---nojebovagamibab.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/pifada.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/dofap.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/b7a7da4968211722a3a493bf71b09e60/19390365165.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ip9899fk5gkcgap40nea2qatp5/3806084923.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/48037854460.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/e5edd97dab087848003fff33b0bf02b4/2085506749.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/jatupotezewug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=thinking+about+management+theodore+levitt+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_off0000dae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F2 17732 bytes
SHA-256: e7c2b568b3e930ead983863378c0de661f11e2e0d961e9437fe41b92cd124d4e
font_02_sfnt_off000120d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D9 11136 bytes
SHA-256: 262f11ce57713a1de7516a509dac552f367b857feb5ac17245757a8b386bb139

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