Malicious PDF — malware analysis report

Static analysis result for SHA-256 5020f9f4d01919db…

MALICIOUS

PDF

73.4 KB Created: 2021-09-24 01:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4e5898dd755a58bf0c8ddd42d72a7477 SHA-1: 8cdbd6a4e10c4da1a34a703789ff8af6cf921365 SHA-256: 5020f9f4d01919dbaa0485d28539ebcb339949ca1b1e2e5605a4424a6ef0c664
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://synerhu.ru/uplcv?utm_term=every+witch+way+streaming+vf PDF link annotation
    • http://naturalfurnish.com/userfiles/file/lifuxe.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/pilujivepemedufezewig.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/sudepezonobisadewo.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/getixoxufefex.pdfIn PDF document text
    • http://maha.tcnme.com/chop/multimedia/userfiles/file/nesobok.pdfIn PDF document text
    • http://dsfly.com/uploads/files/33238786926.pdfIn PDF document text
    • https://tanhaithanhvalves.com/quangcao/admin/file/74534921851.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/lexagekuloziw.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/33691637219.pdfIn PDF document text
    • https://hgb.se/filer/file/nugesivikoja.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b54047e174---64908160310.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/43393678986.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/gavixelirifan.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/zugikovovukasewade.pdfIn PDF document text
    • http://na3.it/misc/file/14303580450.pdfIn PDF document text
    • http://serenetour.com/image/upload/File/lemaxujin.pdfIn PDF document text
    • http://eternaseguros.net/files/files/mapozimetatatuvaf.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/ql4ir3mcj6oganugamsi58q4bm/86780029049.pdfIn PDF document text
    • http://imbirimbir.ru/files/nafozutotufuluseborudip.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/47989923437.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/vudaxikusefaligulif.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/15925916945.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/57211351363.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613444dc43327---93954207992.pdfIn PDF document text
    • http://ijfbn.com/editor_up/tosakib.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_off0000b96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB96C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD183 10868 bytes
SHA-256: e80bfa6a46b6316ed560103f5cf27fd8b93175a2c0dacb6cc44a0596047aa8c4
font_02_sfnt_off0000ea84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA84 17860 bytes
SHA-256: 16c5b60f1a02ff84150576c3233a9edc0b2a13537071cfe2950e3ed06dd51e78