Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc4fd9d7fef65ee…

MALICIOUS

PDF

92.1 KB Created: 2021-09-05 10:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 269058161fd26f86308911fadd36b7c3 SHA-1: 90b4e7e30523f9c679d4580d26de5f48e61fdf9b SHA-256: 8fc4fd9d7fef65eee8dc4a9c1473670a3c8387c6b3f1715b7fc1cc9c8f8d35e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, likely for SEO manipulation or to host malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of embedded URLs and the nature of the heuristics suggest a phishing or malicious redirection attempt, potentially delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://philabc.ru/uplcv?utm_term=acura+rsx+2006+manual PDF link annotation
    • https://www.elguantedeoro.es//ckfinder/userfiles/files/32480354241.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080db900ffdb---89015054901.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/kezatel.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/vunixumu.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec36a756e4---43506083290.pdfIn PDF document text
    • http://land89.com/ckupload/files/tebixaxonusoluwesisokaje.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/cd68af70a69be921db9b3e418cb5bb4a/98713483727.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/k1efh69p8nd0egc532kdolk3po/midimifarazafabem.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aec3c14b7d2---suzejoxasojobebi.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/08cc3918cd0d646c91ef57cc967b096a/90560053493.pdfIn PDF document text
    • https://domilot.com/uploader/files/72084467469.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/13499058125.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/nizuvafifivuki.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/24358489f99209a5e9dbfaecaa8f2aa7/8757255658.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/87117313955.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/ac2def3f0d2efb87b9c00e749615e56b/genowoj.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/3bcgdcfgq7pa7k49q5usaalktb/63807031191.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/fasuforegalagidepazo.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021070206054389.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/5bd940b21bc2ecfd4d0756c98db71d47/xipotuxefepuderizuv.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/revijivosasadapidizafo.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b11799a34d---besonafuxu.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612deed0a11c4---dusifejibovi.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/kozusuzibilenomepitijaxet.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/d97775364139d4e339950cb75790e5bd/ranesulukepuwapa.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_off0000fd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD76 10540 bytes
SHA-256: 970c4ebd0748e4b11d96f1f977963bd5db0640e5bc02e999db0e403d3dcef3a6
font_01_sfnt_off0001158e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012da0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA0 20256 bytes
SHA-256: 5127f79b506f64f03c72f2e72175a030b73d70d2692ee25014f963527f68c22a

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