Malicious PDF — malware analysis report

Static analysis result for SHA-256 873eae3eba915270…

MALICIOUS

PDF

54.7 KB Created: 2021-09-19 04:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a65a0c8444ec8c994ed288120b07220e SHA-1: 76af695905e428f5572fc4859ea705b0d3ceea8b SHA-256: 873eae3eba915270ce61c0602fa25c2df8a99209929dbe61dc026a89368c9bc0
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6853

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://needychild.org/ckfinder/userfiles/files/nirinovekizijamomotezu.pdf In PDF document text
    • http://haiannweb.com/uploads/files/xosogikosi.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/93004086782.pdfIn PDF document text
    • http://hjhchem.com/upload/files/muzakuxozuzubi.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/85626578098.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/57306868586.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/nuwuwelafegedepejakerera.pdfIn PDF document text
    • http://zhymwz.com/upfile/file/75993629196.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/0036248a381c3fff67cac62d535e3300/28839829149.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/62489854812.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16140dc0da9975---33166601600.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/fetipagojipolej.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/lodekebumokakosekisuv.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/fopikodivifomezafubewosix.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/zovefakobufabid.pdfIn PDF document text
    • http://vlajamo.cz/images/file/vubugegagavafijotuvo.pdfIn PDF document text
    • https://fundacjanadzieja.com/images/wyswig_images/file/39724704522.pdfIn PDF document text
    • http://grupophi.es/uploads/files/87276483377.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/20113120707.pdfIn PDF document text
    • http://yuhongzg.com/d/files/24239094723.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/55793687405.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/zaneduxixogajimujodo.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/winuguvutomemuzog.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16145d5f1bf003---dejepuguloxoze.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/penaz.pdfIn PDF document text
    • https://norservis.cz/files/files/439982672.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+compress+a+video+on+your+phonePDF 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_off0000c67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC67F 11092 bytes
SHA-256: 422bb2bc1c1601a4be7b3ea53bbfe4580457289ffb87208a6f51640d67ceb244

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