Malicious PDF — malware analysis report

Static analysis result for SHA-256 97998dfb33e2dbea…

MALICIOUS

PDF

76.2 KB Created: 2021-09-04 14:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 96469353142268bdc03b5ec2e770bfc7 SHA-1: b27a07a44c3e05b81b45236a36ef43ee77ba03b5 SHA-256: 97998dfb33e2dbea31962f1ba0fa6fd9a2b028e760801ca6340fa9c94f740b81
132 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. Heuristics indicate the PDF acts as a link farm, pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier clean score 0.2376

Heuristics 6

  • 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
  • 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://isvpro.com/custom/files/kitisosuv.pdf In PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/fec93d56fb5965100fc1cddfef83a535/tofovirawarek.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160809640b740c---pewojunuso.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/6750112387.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/97593028437.pdfIn PDF document text
    • http://toddfamilyreunion.com/clients/4/48/482e924d5a052aa4a0c13eb8a30e0bc8/File/zitemogasutix.pdfIn PDF document text
    • https://davaocarrental.com/images/file/7809988466.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/27502542039.pdfIn PDF document text
    • http://flomojapan.com/upload/files/lokojewawubejotirelaju.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/2821c6cb2b9b31f1db6c97c12b6263e1/17384478006.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/516b3da895a32917c01ceae5377ff998/mebadafuk.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ff874c1e633---76570859905.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/glab1fpq771pje3riili1g59up/balatusidoxenew.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/ifjtv8eg3o86e9v0g6t0q4eupo/89763269384.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab889ba931---65326707577.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f19b782034---93569128867.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/kubusojusuvedoxugopubegej.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/ritizawovozix.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2106292110231524491yra2e.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a6af9c65efa---27736783796.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/muxodogepaje.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/c20bd6aace6c7957c895681dd55dfc78/vuxadono.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/zaxudejubavep.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/gelumabipozo.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/92156177377.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160862b5638a78---34878727272.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a2c5de71b---susogebage.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/tovazamag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=crossfit+kettlebell+wod+pdfPDF link annotation
    • 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_off0000d3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FA 18268 bytes
SHA-256: 8dffb372407a75b0cebeff8dbfed0b65be800a2ca4eff1354831cbf269c95351
font_01_sfnt_off0001036c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B83 10576 bytes
SHA-256: f5dc7ff670cf96370b23c18bda04404e8cf5571d9e3d0d508a0706d2c9a8336f

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