Malicious PDF — malware analysis report

Static analysis result for SHA-256 393925d3ced3c05f…

MALICIOUS

PDF

76.1 KB Created: 2021-09-11 08:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 889f7352133655bca64839f1795e0885 SHA-1: 698b97ec792fd5ba0676ab177df75a3a266c5d21 SHA-256: 393925d3ced3c05f7541ee5bccac33086fa608eda51d1421c5b574ec86093774
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 0.7803

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://stphilomenaonline.org/userfiles/file/nunelofubupogudavem.pdf In PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/26328555385.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/taguxekoxunesanugu.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/fefma73ao0ko814v158fbh7oj2/bubebaxuvitu.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/19837582101.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613082dbc06ac---66941519082.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/54461774171.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/vasamo.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/86487327314.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/72388683015.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/zuvokikojiwefifufexet.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/bebozunikevejabaxaw.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/10299176666.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/gewagulemiwo.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210911102914_iiv9zy.pdfIn PDF document text
    • http://insei.eu/userfiles/files/juniwarajovitakamoribe.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365a4248a80---53761601210.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613970a14ef1c---31756254445.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64787524803.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/11728619201.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=fallguys+for+androidPDF 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_off0000e429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE429 17296 bytes
SHA-256: 5417ca36fe9625998bdc1f525a93a5e4d970f8047b1dce7fafd4dc0ff7b74338
font_01_sfnt_off000110cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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