Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a8d368e00d942d0…

MALICIOUS

PDF

73.4 KB Created: 2021-09-17 03:24:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5a47517d406c7aaaf1a9d3f7431a97e5 SHA-1: 5471c38568841da09efb378edcc902a4c5d1044c SHA-256: 3a8d368e00d942d0b768660a26ed7b054b6a078b364ecc3323e867e9a1ca65fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, likely intended to redirect users to download malicious applications. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing and potential trojan activity. While no scripts were directly extracted, the PDF structure and embedded URLs suggest a phishing lure designed to trick users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=arlo+app+download+for+android PDF link annotation
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e08bf5c7f1---7260011800.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109011033257373.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e380d02a2---wivamiwutut.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/161309f533c370---47371049712.pdfIn PDF document text
    • http://profstil.az/userfiles/file/34565508518.pdfIn PDF document text
    • http://namlinhchivietnam.net/userfiles/image/file/22357787768.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/6612fb61aebf17ef68fb8775edd15ab4/15643356921.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/88290805500.pdfIn PDF document text
    • https://www.nickelmarket.co.za/includes/ckfinder/userfiles/files/xesefizarogajakelinez.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/gitizevufiwinovosutewax.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/21410397586.pdfIn PDF document text
    • https://phongkhamtamthan.net/uploadeditor/files/94138611054.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/jurevilova.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/dikagigo.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/64034645632.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/80935840549.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/4638019097.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/1a6049f6c475ff6c5ba37e2f34bf501c/87128489185.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/38316120011.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/lazawefuxikuwome.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/76666938781.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/81861425305.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327e8135417---69426848442.pdfIn PDF document text
    • https://ip-pharma.net/data/files/24556231269.pdfIn PDF document text
    • https://keepingscore.org/userfiles/file/88776909780.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/18038515480.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_off0000be2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD641 16792 bytes
SHA-256: a3845d3254174f6e436672026572fc33d5f6b4f135030d36f5257d40302dcf99
font_02_sfnt_off0001012f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012F 10160 bytes
SHA-256: 871f9e05af4bb50d5c110b7e0b64f721e457186875cc583fe14048cae918fb1c

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