Malicious PDF — malware analysis report

Static analysis result for SHA-256 482226b0ad2608be…

MALICIOUS

PDF

102.6 KB Created: 2021-09-02 02:12:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cfccdcf988d45624883adec0004a879b SHA-1: 6ef0c938cc265e31c541d426784809bc01576c18 SHA-256: 482226b0ad2608beea617d26f2bbfecd75e43d8cd60c51e5c9bd643761a23121
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://cructi.ru/uplcv?utm_term=how+does+camouflage+help+an+animal+survive PDF link annotation
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871965e6006---12284838871.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/161249cae68767---49430727211.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb816036d1---wiseneg.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/11248584.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/gawazeker.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/furegan.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/41594962418.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/81115223552.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021070413181973499.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e4e8d6b9f---dexekupazoxamititiwal.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73426813634.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/5415859ec0c9308df5e2bef82e274bf5/bowirapitaxomubeveworun.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/mifabipumik.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/defuzujanonibux.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/zimobupuwedar.pdfIn PDF document text
    • http://qdjshg.com/files/file/vuvuzonusemufi.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607391c0463d9.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/39769314652.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/46001578973.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/do1i8u91d7vdkubp8pkdp43mru/43360673846.pdfIn PDF document text
    • http://prestopc.it/upload/file/77708876070.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/xojogatixadovitarola.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/c0d9bbabe49cf04d7f73568f5c2262bc/nutomasekikusaropu.pdfIn PDF document text
    • http://cuatudongnhatrang.com/uploads/files/bozuxowatax.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_off00012a98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000142af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142AF 11212 bytes
SHA-256: fdc48fe5894347ebb0c157573cdcc32cc921f4bea46fec468e418e98c17a4494
font_02_sfnt_off00015c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C7E 18248 bytes
SHA-256: 76564e5a2af9fd2e084966e643df064c9548972cadab02b73abe49f6dc3a3188

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