Malicious PDF — malware analysis report

Static analysis result for SHA-256 56b311f13d6e5975…

MALICIOUS

PDF

76.2 KB Created: 2021-08-07 20:31:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 89a501e2a4bfc3e058efd261456ba514 SHA-1: 61081c93badc4920d418bbb4808db4d24c213b4b SHA-256: 56b311f13d6e5975ac14b565c6332003413743fe457bd48b1a6c76d14d743538
154 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, with several hosted on compromised CMS platforms. ClamAV detected this file as 'Pdf.Phishing.Trojan', indicating a phishing or trojan distribution intent. The ML classifier also flagged it as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5474

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 http://unseenadventure.com/userfiles/file/78571288287.pdf In PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16088b8f3f1b16---bilazimafitaz.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210712212455.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-4-30/20210430204744281618.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/a8b6a1474c00bc69e62cad89b9761062/jifarefupakosi.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/c344758cdd613c3d2fcc96e5533a2f46/39225611736.pdfIn PDF document text
    • http://www.asslar.de/downloads/givosipu.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/12f411e3a8803e212a16c516861c1338/ruvasulikusigivovizezidow.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/kexubodaluxulekirudixa.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/sexuvexubibubeva.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160840aee87a8d---5982287845.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210513063254.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/65501522935.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/57924969170.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a25fc7e351---wezigoxur.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/70783960724.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca26c768d0---86397884003.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/kifitudivenuzubike.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608511797342c---fovozijukiwetuvak.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/47727559454.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/48724923961.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a1264a02d09---dujabukolajavexexib.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/7cgvssg6jp8h3f2nivkqeckjb1/miwekijinujumajekaja.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-9/20210509062636631352.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=can+i+print+a+temporary+driver%27s+licensePDF 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_off0000e395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE395 17332 bytes
SHA-256: e6fa5ee6e4313fd664d384e64f1d1b6d4038d795130feb116a70f16b47810708
font_01_sfnt_off00010fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1