Malicious PDF — malware analysis report

Static analysis result for SHA-256 265c1cffeffe193e…

MALICIOUS

PDF

70.3 KB Created: 2021-09-04 17:19:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: fd37f4b2ff07fa4ce11c0a409d0827a8 SHA-1: 7b0d1df6cdb9399cead6eaa3094d09fc2b34f37d SHA-256: 265c1cffeffe193e1d56d996a981e61a751a9917d8587664bcf70a32ec61eac5
154 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several pointing to compromised WordPress upload directories, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO manipulation. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8257

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://gregor-biffiger.ch/userfiles/file/33709055197.pdf In PDF document text
    • http://closehorses.com/userfiles/file/8818641309.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/wiraniduwe.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/jgrpvfe41v422r38radio09fbg/tulunoxakipibojij.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/79033168464.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763ac1c9847---vigonerix.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/596ad6a327a99afa5e6d6364d6df8076/35298833004.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/18095724320.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073bf1553c14---megurudexetanegojivi.pdfIn PDF document text
    • http://webursitet.org/Files/file/23806957269.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca2d16f261---30973108672.pdfIn PDF document text
    • http://keysrotary.com/clients/d/da/da683cbc30bfd632b0b364d14bdd38fd/File/65582444524.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf6766787d---wojugipi.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/gasovopazoko.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/25710388446.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/61833712223.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091abc594ea4---45660566914.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/4569185811.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/vugefonolipi.pdfIn PDF document text
    • https://arerp.kr/data/file///wetukapogoruko.pdfIn PDF document text
    • http://minhvuongthuphap.com/upload/ck/files/fazewejademadetajawodim.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608729e7b49e8---51562982551.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210825052133.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/87688406217.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=mutants+and+masterminds+basic+hero%27s+handbook+pdfPDF 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_off0000ca03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA03 18788 bytes
SHA-256: b7301cf6068f084d4e08bd062528f22f09a0082a2d5ff193efd598d7960c709e
font_01_sfnt_off0000fb25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB25 11196 bytes
SHA-256: 2124e92fbc95352676e091d5b5f5bca6f3a4641ea37b2e6bead80c47badbe658

Open this report in the interactive analyzer, or submit your own file for analysis.