Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e347e8e152276b9…

MALICIOUS

PDF

92.6 KB Created: 2021-08-03 15:41:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9b00cdd095d06cbcdb7220012c37e7d1 SHA-1: 7ba264cbafa2ef1e9e4a29b421eb2c5160b9c57e SHA-256: 4e347e8e152276b98bd79535f299d4076ceac4a79436daac370d434a1b24c3be
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on potentially compromised WordPress sites. The presence of a 'download button' heuristic further suggests a social engineering lure to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/uplcv?utm_term=diet+plan+for+gym+beginners+in+india+in+hindi PDF link annotation
    • https://theatresaucinema.fr/uploads/file/nolasemomuv.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/wodaradabo.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609851ddb17a9---60787260344.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/f723ed2196f578c56c290488dbedf595/tikim.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/xojides.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/5696391742.pdfIn PDF document text
    • https://icbacademy.com/upload/files/fujugizomidij.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/tiletatet.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160991d01df92c---xuginomobaxutokutu.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/18657714871.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/dokesisogapalogefaneke.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/dkar5f9nh3v2ksp980g6uvq3g1/jugimulijawofup.pdfIn PDF document text
    • https://susta.vn/userfiles/file/xewoxexadad.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9cd630d36---38863032401.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160943b61b33c8---jolozavenufimera.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/54ea965c74b511d44c584d559c3030d4/zujebewozisajinufuvo.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/joxokoluxuxikar.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/e897c745f7f08f6cf5f1d898e9a9d4d6/90733006890.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/sizizerupisoko.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/47713898442.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/dajibumedexukumokajizut.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/naeibnq299sp5u1qfubvbovkv4/35334477276.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/wanupisepidamufif.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16072633ad747c---pefidusiguwemuzuxiduw.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765b7ad9799---53869135630.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210630031407194.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_off00010070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10070 11200 bytes
SHA-256: 07cdca6e624868ffe06ad7baab4922c848b335779ea74f02c8c7267e7b779d74
font_01_sfnt_off00011a08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A08 17876 bytes
SHA-256: c129e969aeaef4e907442fa24f8a7dd418c2463e9ab79bbe3494792be4cdf6e3
font_02_sfnt_off000148f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1