Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2a16716f338fe56…

MALICIOUS

PDF

75.8 KB Created: 2021-09-01 10:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 1e760389492d87212063d62d6524caac SHA-1: 3f3cf2fec25bbf7f0a1ceca68bf95b3224ce30c1 SHA-256: a2a16716f338fe56c221707897111fd5d3d659131f685240e7be1f7779fbd46b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8481

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://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813da78c7fe---kaluxevuwosidufe.pdf In PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16103ff182386a---15568666667.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/4e2a47f52ba301fbe4968fd258f11137/zeminosijofavujavob.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/0646a06b56d4d229c6385b95ec9c6d75/12463326978.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210830/0425212964.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/46045502218.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/dizoso.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a1dda80d959---taluramuxafem.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/2kpblqroh2uf9b8vsirc55qg64/nujigidibuxekogamiz.pdfIn PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/19437853795.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c671bf6b0bb---fonodevekapatuw.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f44e8c876fa---37210124377.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160900df267e35---naweposezefor.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/77034186568.pdfIn PDF document text
    • http://crabber81reunion.com/clients/b/b6/b60cf3d631ff247311937b5f15bedc89/File/33257005701.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/xetuwebetepijaxefel.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfce4fe6609---74583610923.pdfIn PDF document text
    • http://quinta.cl/upload/files/1670739122.pdfIn PDF document text
    • http://keysrotary.com/clients/d/da/da683cbc30bfd632b0b364d14bdd38fd/File/95781877701.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/58298322954.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/d0f45126a07c4de4133ae2b7c84e1e6e/rigenobal.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/xabemu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=the+dry+fasting+miracle+pdfPDF 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_off0000f2ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AD 18460 bytes
SHA-256: ce5ce9534edd500117be4bc5b0abc1a251037048308eacd24eb25839d36c9c58

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