Malicious PDF — malware analysis report

Static analysis result for SHA-256 603d888aff1b9edc…

MALICIOUS

PDF

80.0 KB Created: 2021-09-18 08:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0cc37baa360657a3e41f4e68365f8748 SHA-1: 11c996b394571dd809c977d06803c12a7be95313 SHA-256: 603d888aff1b9edc4d40bd70198f9461a51cbdf1bbf71ccf8d95cbdf3d0a4ad2
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to potentially compromised or disposable hosting. The heuristic firings indicate this PDF is part of a link farm designed to redirect users to external content, likely malicious. The embedded JavaScript suggests an attempt to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6231

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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
  • 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://smidgel.ru/uplcv?utm_term=new+super+mario+bros+rom+hack PDF link annotation
    • http://tfforming.ru/d/files/93898000393.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/21005388059.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/48260865846.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/gipewibipix.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210915_205731.pdfPDF link annotation
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/64588320750.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/11152015676.pdfIn PDF document text
    • https://shinaltd.ru/images/file/8138329741.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/95077120852.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202109041900147292.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/lexesekelomimosuwotuw.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/7b1a7e9ae491c777fda79681efa80388/jakifuniguxazadejugefa.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/68238658149.pdfIn PDF document text
    • http://abnicum.ru/files/file/50321951057.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4194c6d71---rapifefadofusele.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/49287311244.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/32387765375.pdfIn PDF document text
    • https://educhina.mn/editor/files/62710410199.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161425ef608449---58527152703.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/75947609161.pdfIn PDF document text
    • https://mallorcaboom.com/res/wysiwyg/file/tigorexamamivatemav.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/cktrqdpobm1uapjbrqmc165h11/derolipenudigejigezibune.pdfIn PDF document text
    • https://www.netcorp.hu/data/editorfile/18857751742.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/afd247b6ac5d0e5919782981e40023de/tagudomenajanex.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/takujivogarebawodejudexu.pdfIn PDF document text
    • 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_off0001018a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018A 22024 bytes
SHA-256: eb7097d7ce3f6c8e5e9d8ee6506084b6cc51e5344256f0fd4357dafe4382ac78