Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4f0ca34b9109f23…

MALICIOUS

PDF

76.2 KB Created: 2021-06-26 05:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bdc250bd708a7f9320eb9bb12f9edfa9 SHA-1: c1d604cf4626068e0e76c5e0700e437d9ebafdf9 SHA-256: a4f0ca34b9109f239d167cab553fb93f6b8eb010b2ec8189bdd04866efcfcc96
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7328

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://mid-europe-ex.com/images/blog//file/19003169551.pdf In PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/ed2f2f8e81a12fa73541522702e2d603/xifumos.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/52485442696.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/vifawinakosopu.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/39032038465.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/galusapowaviwasivuwuxine.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/42451048759.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16087b5a4bd115---50423619810.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/wigilegu.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/d9a387ad3fe8b46a71ddb0b8fc8b977d/74655636481.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/81675002704.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d69957acc1---josabulagowopolo.pdfIn PDF document text
    • http://josephpowellfamilyreunion.com/clients/0/04/04c15d356d3082020e114f8c0300f46e/File/91914881484.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/pimagiwawut.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/81902039048.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b6270857c3a---37681574596.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1d5b46304---10013290131.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/c8d21da04fd3324036e20caa52fd998c/fikereb.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba76c0f07a6---54076278463.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/46b5b592311c946d882f18ce49d0d9d1/27376331080.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/91adfa140b1a501e55341bcf4280c139/liwujorasaguka.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb8b2da60b---gifugerobinapodozom.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db3455dfb9---ririnuxisivugidutolinopid.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfd90a88bb---31014270787.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/5727982e967e16db887c708917f7841c/fikafufubidimus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=focus+2+pearson+workbook+answersPDF 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_off00010807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10807 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1