Malicious PDF — malware analysis report

Static analysis result for SHA-256 09d55937ed3c2bd8…

MALICIOUS

PDF

92.7 KB Created: 2021-09-10 21:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 99b2141310f1c9c282081cec41220e6f SHA-1: ef6142ef2db4df9033519ab8eb3db6cea44e7fed SHA-256: 09d55937ed3c2bd8ae1ed08f432ca7aa03951ba90d48fc0f0f38781f4ade6a7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://maekalocal.com/Maeka/UserFiles/File/45423677709.pdf In PDF document text
    • http://vning.net/filespath/files/20210904202227.pdfIn PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/30192323895.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/xekelozurimufenafozudik.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/91658845179.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/nupevet.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/88544451487.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5enffgcclaukfe4u96sqccan17/4499749654.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/gupekaranimefekafajojupi.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/40398834460.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/65767446866.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/92128533549.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/nazaxomesomokukipa.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/selofososulifarew.pdfIn PDF document text
    • https://alariel.be/userfiles/file/23635229306.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/58432050138.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161314a57cae40---34982547543.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/1140316734.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/53945978450.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/84b2ce3519a4e2112058287781358fbc/72953602327.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/e71d2f91ee9845ccde09bfdf10e80a7a/5020378159.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/45461496028.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/ribigepegenibeduz.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/c0a725b7c5c13fba803c886e9b4884e2/95019864939.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/11280727218.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=game+luy%E1%BB%87n+c%E1%BA%A5p+offline+cho+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F9 11288 bytes
SHA-256: fce0a249d8abd751c6b08af943d9072337e3b6d378e42888784767b494393025
font_01_sfnt_off0000fd93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD93 22108 bytes
SHA-256: aaf1cb1e9c62079d82ff9a48b5e789aca1ce127f2b178e638c97901613f8671d
font_02_sfnt_off000135ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135EC 16268 bytes
SHA-256: 5d5ada485674a4706c09bdcb27b257c456605191060bc4d4347f458afbf8e5ae
font_03_sfnt_off00014c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1