Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6815cdb7c57a2df…

MALICIOUS

PDF

73.1 KB Created: 2021-09-21 12:31:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0b2f181e4aa3e289a29e3b8dfb367d32 SHA-1: bfb734a4b9b094749ca4de97bf7ef9fbe047a449 SHA-256: a6815cdb7c57a2dfc413158421037d498a541c10248cf004d586bd82f2aa3e24
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The embedded JavaScript likely facilitates the redirection or exploitation process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5003

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=words+that+begin+with+soft+c PDF link annotation
    • http://giayviettri.com/img-ftec/files/43106477608.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/83970271033.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/e3cca8cd3d3568eaf789e649660e997b/76226000089.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/dojurupirirawe.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/53700809690.pdfIn PDF document text
    • http://elskenecologie.nl/files/kovukinurewebekivan.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/ruton.pdfIn PDF document text
    • http://gucaoyun.com/uploads/file/08195158300.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/duridamaduwudetokididejom.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/meromolazajag.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/11020412590.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/lerejoxidimavexemenesip.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/vupazolovefukuj.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/s0apohmfm2avo0r81qfl1ndnjq/7478622526.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613295cfe14d3---70685165775.pdfIn PDF document text
    • https://mattress-leader.com/media/14656074621.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/xepefav.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/6988e8f4cf6ab122bf083990aa5c6651/vipaxupoleredupepinufa.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c42502c9d7---losawedibebajo.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/er51uhu1cb0637lve5np6u5l34/573283411.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139fa816923f---jatowixakajanezava.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/66937953166.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/46700072643.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/64671817938.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16145af4a4869b---76982480939.pdfIn PDF document text
    • http://turchifiltri.com/userfiles/files/tirozikusepen.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45E 10928 bytes
SHA-256: 258d5d32e72774a52a7b51cc5ab167d506606372811dea605d2747e4b3efb49a