Malicious PDF — malware analysis report

Static analysis result for SHA-256 b109cb9bc1e547c4…

MALICIOUS

PDF

79.7 KB Created: 2021-09-16 23:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d79e6cbdad4f214a7770680dc5946c38 SHA-1: 3d722559304c2b659f303cae156cff9c7374eb7c SHA-256: b109cb9bc1e547c4220a4f6a9a533b0c76aca883d676a29e5d361f47b0af8b7f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads, suggesting an attempt to obscure the final destination. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature, likely used as a lure for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4167

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://rwd1.thadv.com/upload/files/28475104050.pdf In PDF document text
    • http://china-miyaco.com/img/file/20219483812.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/dbda3d54669e5fc8ff2585bb8dd2ff8b/pozawivodatekejabe.pdfIn PDF document text
    • http://erdbau-rauch.at/foxebixuzovizu.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebc53d6d4a---xejuzolekoxuberumineruna.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/161336297a011a---mazexakisumavo.pdfIn PDF document text
    • http://matras-devison.com/upload/file/fowipefojigusodutag.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/2155944436.pdfIn PDF document text
    • https://5uempat.com/contents/files/lixufe.pdfIn PDF document text
    • https://upaspor.com/resimler/files/vanorepejanogawujupilafe.pdfIn PDF document text
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/meredufejuvepibemawisavan.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/nivisufenufiga.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210903_2FC22F753A42D879.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/gapevinuzixuxepiwu.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/98332888575.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tasosofirinog.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a59e013f3a---23142976195.pdfIn PDF document text
    • http://kvrhousing.com/uploads/29882291059.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/27001990069.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/33199049057.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/wuvufatitepumimos.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210913_050055_133.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/zumugun.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/69406126076.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/12457842114.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=eddie+huang+fresh+off+the+boat+pdfPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/nitelusapumimenaduvitafim.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF40 18204 bytes
SHA-256: f1646c75dfd4c415b759e3a83012b509bcacd03b087bfa73c90a816d3aea4fae
font_01_sfnt_off00010e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8F 10956 bytes
SHA-256: 7f96759570d6eb1479420b56313446b2a2cfce4a47bb551ee9da1d1edb4a629f
font_02_sfnt_off00012775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12775 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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