Malicious PDF — malware analysis report

Static analysis result for SHA-256 9867619b52c82499…

MALICIOUS

PDF

79.1 KB Created: 2021-08-29 07:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: dcfc66fdb8b5acf5d664deefa8195ffd SHA-1: c2cd1a1d1f682777d1e2329b9b4230b8e385fea8 SHA-256: 9867619b52c82499a94a01fada80132b13532acfa274bfd48844c7e4eb04a52e
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 0.9975

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://synerhu.ru/uplcv?utm_term=age+of+empires+asian+dynasties+free+download PDF link annotation
    • https://emauto.lv/index/images/up/file/bateneselug.pdfIn PDF document text
    • https://nadinerogger.ch/userfiles/files/makewemud.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f823763a61---vawuvigutabugede.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/91529802698.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/53291694371.pdfIn PDF document text
    • http://zzps.pl/userfiles/file/lubekukitowumezumiw.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/negezukod.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609247c2a5fe0---lejukugevakipe.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077cb6337224---69740376851.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cf3a04ba4---33390867467.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/muxopiwijope.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/mesenibab.pdfIn PDF document text
    • https://icbacademy.com/upload/files/votepabamirag.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/dejalifolu.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/bowatojegobipatavisotosow.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/86945932163.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/79078094030.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/n0hgs0ofohta7ql9o1cc8uf71s/74313455940.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/33920169585.pdfIn PDF document text
    • http://stylekd.ru/files/92135448769.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/vomemuba.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/39546276065.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b0e3bad5e---mevezafoxebopos.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/22937824844.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/24282023912.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_off0000cf15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF15 17420 bytes
SHA-256: 7b00ecd7d3d7bef6d1e72f126b2d2fe6771fad0c0d7d3120b6e17509b21126d5
font_01_sfnt_off0000fc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC86 11020 bytes
SHA-256: bd286b5c589aca00c3e13990d769b00910df3a48968b2a68d5c259ae39e54f2f
font_02_sfnt_off00011608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11608 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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