Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1a506f559242783…

MALICIOUS

PDF

131.8 KB Created: 2021-07-26 19:23:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 34a213a84f92cfec975c0088b0cd1175 SHA-1: 5e0bef2e7163823a92312fdf3cf92c135772abcb SHA-256: f1a506f55924278399830546dfab1c5de89bff8d8ab2d32d57e82bbbfbb55502
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites utilizing the FormCraft plugin for file uploads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is unreadable, but the heuristic firings clearly identify the link farm nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5561

Heuristics 5

  • 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
  • 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://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0fa58031c---36805095729.pdf In PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/86c38b47e4d3af91e4f0e556a9ad74ca/dofumutipijofuz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd0ab2f854---89046112138.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a241bdaee---70721964595.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f946a463a5055b9e4fe944f3e25c8339/penunaru.pdfIn PDF document text
    • http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/sunudotowediso.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076bb04e9aca---zoxigitiwulikamopabuwin.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/89603806349.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/73967728228.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/73107729753.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/xubigaxidezoselafado.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/eabc3fe8643616078e37cc2ad758aed4/98930482610.pdfIn PDF document text
    • http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/sadeluj.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/65241043716.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/6rfp5dnl14v0m6515q0pp1u57r/fosiwafimobod.pdfIn PDF document text
    • https://digireg.ru/upload/wiforoparetikorug.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210710190654.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/xodumotozedu.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/wototomuvek.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c1ed6365e---46454629503.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/5480811d18d1d9f60d503b598eea49a5/jurirafisifogewuzofu.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/33485119979.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/4876841082.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/36246337246.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/gevuvin.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/redurukixijosobenasuloku.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/nekozinu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=fox+business+news+female+reportersPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C70A 18488 bytes
SHA-256: 8ea94c6bdb000429dcf1eed98f3a0e26c1b1a3e7775e14e69d3943fed37da4df
font_01_sfnt_off0001f7cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F7CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1