Malicious PDF — malware analysis report

Static analysis result for SHA-256 10f8a0093e117d8c…

MALICIOUS

PDF

66.5 KB Created: 2021-10-13 15:28:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6c77afe9d67ed94098a9967893a64e98 SHA-1: 488547de9dbaddc8d8741b50541885d872551e32 SHA-256: 10f8a0093e117d8cbd32f997428db81fd21057ec8b62c6733f2272b55f42a428
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm pointing to numerous external websites, many of which are hosted on disposable domains or compromised CMS uploads. ClamAV and an ML classifier identified this file as a phishing trojan, indicating a malicious intent to lure users to potentially harmful content. The presence of multiple external links and the detection as a phishing trojan strongly suggest a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6906

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 https://habrit.tw/ckfinder/userfiles/files/28511632520.pdf In PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/53609066131.pdfIn PDF document text
    • https://beaszemin.com/files/85782244524.pdfIn PDF document text
    • https://grnca.org/img/files/files/86537453989.pdfIn PDF document text
    • https://www.vconsole.com/ckfinder/files/rogisegipiguvepi.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/zebin.pdfIn PDF document text
    • http://haki.tincorner.com/uploads/files/92533728300.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/27424441876.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/ea0a54904858fc73d214a3afced0b449/bajuxisenelikaxegaf.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/ic6k9nvkhcpnlfiighomuqls16/tejuwowedofixuz.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210904_C6BE0A26ACFF0202.pdfIn PDF document text
    • http://haokunchem.cn/upload/files/83875673855.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/vqb7823tdqot1imvjaniq2fjj4/legevaxixefujitemo.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/raxosesoxekar.pdfIn PDF document text
    • https://clove7.com/userfiles/file/sobogusefi.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/godeviwuwunis.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/tebudilerofivez.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/81611177384.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/nimalatewu.pdfIn PDF document text
    • http://wych123.com/upload/files/wemovopunibaju.pdfIn PDF document text
    • http://chieucoingason.vn/files/tonazemesupifutut.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/78222359432.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/25077120775.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/e2o1nfdb7qvbcn89c9eo9dm0qb/40720807961.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/6Zflnl449io/uplcv?utm_term=pdf+to+fb2+converter+onlinePDF 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_off0000d28f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28F 17488 bytes
SHA-256: aeb6b1331a6916a35a825e0413e2374d30b26765630f34ab683128201a0f597c

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