Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8052cbc2b8a51e6…

MALICIOUS

PDF

82.7 KB Created: 2021-09-01 05:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 828e5575512414c93dae523aac31f59c SHA-1: fb8734cad14eac97626a50c1c11986a101ab1ae8 SHA-256: f8052cbc2b8a51e6a6846f8cd24e5430bf32d50cd15eb0c90d139725cc7faf1d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, pointing to multiple distinct hosts, some of which are hosted on compromised CMS uploads. The embedded URLs suggest an attempt to direct users to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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 http://chapmanhighschoolclassof1968.com/clients/c/cb/cb1fed5110c07f199f416a264ee6943c/File/30904508263.pdf In PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/85950251942.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/nebolan.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/rokumedaparo.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e525afd222b---19289333795.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/gasumobajuzivomaf.pdfIn PDF document text
    • http://blueyee.com/upload/file/111622511536.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/bexapigajamibobolixo.pdfIn PDF document text
    • http://www.bash.cl/media/file/61485470784.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/65251518392.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16081c01376717---6840482575.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/9e09570f8585875f8d3df4404e6bb5af/79507605293.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/3712362570.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c009630ffa4---kixekaxemoxitulax.pdfIn PDF document text
    • http://hutergroup.de/userfiles/file/zobusimiwotukubesifodet.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070781779386---lofowoluwotenilaji.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d37ebb7de2---muguxekifuwogowomotito.pdfIn PDF document text
    • http://vo23.ru/upload/file/27031513403.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/zajasejafererozajix.pdfIn PDF document text
    • http://ccsl.asia/files/magimiri.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/vasebabenabaxodaj.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/93716771840.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/jibemodorujas.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/regifekegobenixofemizosa.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/72071693544.pdfIn PDF document text
    • http://d4storonto.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/mijamixis.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/gafidimaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=gameguardian+coin+masterPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE58 17612 bytes
SHA-256: b723a161bd8f0f3c5d32954f4ce57734b1f469cae27221b02d3d61990a34335b
font_01_sfnt_off00010bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF8 10808 bytes
SHA-256: ace3332cdda42bdc36d0cbb518fd596bc2729e3cfd896aced8a6c58155917b58
font_02_sfnt_off000124b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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