Malicious PDF — malware analysis report

Static analysis result for SHA-256 a00f5e1aebd2ec32…

MALICIOUS

PDF

81.9 KB Created: 2021-09-18 03:31:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fc5ad57fb46fea980824d015edcce509 SHA-1: d17593e9cbdb35fd521abaf89c31c53a3d34e3b3 SHA-256: a00f5e1aebd2ec32668eb2e7a31696c02e0981404cf47a92bbf829881345b34d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute phishing content or further malware. The presence of external URIs and link farm heuristics indicates an attempt to redirect users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=what+can+android+tablets+do PDF link annotation
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/161373c7fe844e---jekila.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/liwupimerozixasurusunoxun.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/50529143526.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/161342169adcb9---vizunatabinuvuji.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/suworotabasafo.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362ad0b4681---laxuguku.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/86286283788.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/15751586753.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/zolafareb.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/51869703007.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/55832747305.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021091105434973499.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/piwerona.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/29990663726.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141608b4e615---pawobuxaxulo.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/susavikofuliv.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/11189170716.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/44619771046.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/13112577882.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/b8qr9j0p3neb6nfi4113mf9409/xojaxodiwisoga.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/sulanumununupuzemo.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/2109d055ca15704011eca8181af1b27c/69633677401.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/64149310798.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109131410071276.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/bidurugowunebumidimimu.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_off0000dccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCD 17652 bytes
SHA-256: 3f05eb01f6df7c5033da9685b59b3e7b20ef0b1ebd9a806986ead5e47c539d04
font_01_sfnt_off00010a1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1E 10600 bytes
SHA-256: a4e91c4ddb2d5d8d1b538ff5816d6229d256a582e001afbe61bf54cdf2a39607
font_02_sfnt_off00012247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12247 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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