Malicious PDF — malware analysis report

Static analysis result for SHA-256 708bd489c6c38308…

MALICIOUS

PDF

119.7 KB Created: 2021-07-29 23:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4235d45abdacf9e7b0156f0bc29231f0 SHA-1: 10e71a13c8aaf91dbad51330d653d4383c6cf658 SHA-256: 708bd489c6c38308f6bb6ea254d14f3bae1869ce97062780c84e775d2fdac2ab
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV, indicating it's likely a phishing or malware distribution lure. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a link farm strategy on potentially untrustworthy hosting. No scripts were extracted, but the overall structure points to a malicious document designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4594

Heuristics 5

  • 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
  • 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://huntic.ru/uplcv?utm_term=libro+de+texto+cuarto+grado+matematicas+2013+pdf PDF link annotation
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/r875821ealkve54f00i4da4qs7/kilewiwulebebepibut.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/a8be292f1cea1a220975c33b2da206c7/33990481764.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f2bed9061---20927592525.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072208a72001---9015033348.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9930e4609---vozedajipoxes.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b677e9398---46037058774.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/ecddefc547acdc630cf5b4f393146338/dezedorez.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bff68d5961b---kisuxedarutamaseresosof.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/2890676489.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/ladegifejujokasa.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/46293632978.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/jd7hrch788hvu73svodd7c0e22/97531009245.pdfIn PDF document text
    • http://matras-devison.com/upload/file/kolukimavajevokas.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/51625125705.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/25456069865.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/kajexoketetosifaz.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c151209d45---mexuwexekit.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/xomezuvipakedopesaduwux.pdfIn PDF document text
    • http://faulkfamilync.com/clients/c/cc/ccb94402b1eed20a0583117be0c0b506/File/gixoxupokokapugevibud.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/50976087848.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec33214ecc---54854794105.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/60494864261.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/71134484947.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/xatinedexuforolerubujo.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/xotomofizugogonivigirenas.pdfIn PDF document text

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