Malicious PDF — malware analysis report

Static analysis result for SHA-256 c08f6a7e07e15300…

MALICIOUS

PDF

95.3 KB Created: 2021-09-02 19:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0384df1c0cd31c8c05717f5736215682 SHA-1: 521d8bbc6e60179aad17900308ca2c74c7d93bb1 SHA-256: c08f6a7e07e1530020fcc6e8448dc91eb4fa2036c8958e3eb73c8466b54a7616
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites and other domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://medvor.ru/uplcv?utm_term=don+de+discernimiento+de+espiritus+pdf PDF link annotation
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/feda048fcda6d7b834d03fed61a4342f/97655407145.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/kuwometofonuful.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/6p545rapimoje5son9ragph6m7/puwonejazafu.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/xaxozejixinuxutiguwaro.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb198be15a---zipuzaxifagogetodamajuxi.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7520de619---jafavu.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/tikumalapunajuwagel.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/9f7d2d1bf72764b178561cb8f870e709/23388752767.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887a7c50d58---nunama.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/151il3cht261gg8s7bhfm524n7/nurisaxefi.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/0def6917d20679432fd6cc1c7ada1468/likemujavazujuw.pdfIn PDF document text
    • https://bouwservicewinthagen.nl/userfiles/image/file/84490837273.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/gedajokonatile.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/fenurowovakaw.pdfIn PDF document text
    • http://greaterdeliveranceministries1.com/clients/61527/File/35371437173.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/jijumedubanefumuxati.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eaeff14f62---ronesokijarubivunalat.pdfIn PDF document text
    • https://artbynela.com/uploads/file/ritejukojajupapujazepovil.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e40e2510d8---42704981044.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8517d3484c---29205993120.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_off00010d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D15 10676 bytes
SHA-256: 082c14e0320e5237cbed8f5fe96ce4adc8f5f8a9030d7638fd699483811cf00f
font_01_sfnt_off00012589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12589 19788 bytes
SHA-256: 84db3d4fb4104ea5d2bc53ddd1746ff994bd489f5b53e779d582683bd32cd056
font_02_sfnt_off00015782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15782 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1