Malicious PDF — malware analysis report

Static analysis result for SHA-256 185162f6f9038a66…

MALICIOUS

PDF

65.1 KB Created: 2021-09-15 09:21:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ee57c996ca685790a89f88936194aa2f SHA-1: 530a02420ea19073c2259a6607ad524f856660dd SHA-256: 185162f6f9038a66620d6ddaa401e15983ca77e140f2b6dc7a86eaf7630df2d7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such links, often associated with SEO manipulation for phishing or malware distribution. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' further supports the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6960

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://tiszaladany.hu/upload/file/25707967347.pdf In PDF document text
    • http://fashioneducation.ru/userfiles/file/tuvitejokipa.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161365be2a50cd---liborarokotezojeruzeta.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/5960528873.pdfIn PDF document text
    • http://eubeer.vn/uploads/files/97991737321.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/71154080854.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/60722717657.pdfIn PDF document text
    • http://bdsductri.com/upload/files/telejitibovoj.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/75068978288.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/ketunopewinaga.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1614121f5d1cda---21669134722.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/55153234384.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/kavivusutoxavoditapofet.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613429581adde---zaxamanoreregomapur.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aab909ede0---56907552557.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021090220504152.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/1d44f3632d89b0ab6c76a4347ed7ddc6/13045061489.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613354c75d516---14411007887.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/sofefakebufe.pdfIn PDF document text
    • http://hodori247.com/uploads/files/97343498822.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/50155513671.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/030700378535.pdfIn PDF document text
    • http://teifsepahan.com/files/file/94381541354.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=fortnite+v+bucks+generator+ps4+no+human+verificationPDF link annotation
    • 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_off0000d088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD088 11336 bytes
SHA-256: 3db4313f1d7de92e52aac61d8f227359114b1b531b59242cddef02d0e58ade55

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