Malicious PDF — malware analysis report

Static analysis result for SHA-256 90d0e2a93c0efe23…

MALICIOUS

PDF

64.0 KB Created: 2021-09-20 13:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 940dbef20b84ad1378ef6939059cf6b2 SHA-1: 9113fdd1c9d277eeb83237b638d7b3e669138a43 SHA-256: 90d0e2a93c0efe23f1b99ac21472e429d44c382bae16c28fc62f7a2bcb0bbfd1
162 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also includes numerous external URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. ClamAV detection and ML classification further support its malicious nature, identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7092

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 https://inwebjor.ru/uplcv?utm_term=tamil+law+books+pdf PDF link annotation
    • http://lamorenj.com/userfiles/files/buxukusedomimosipalo.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19252825136.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161365a8031dfc---61540193676.pdfIn PDF document text
    • http://fortwashington.abwingsmd.com/uploads/files/luloregagifup.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/51921305710.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/24072244017.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/69689954195.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/wanavajofupuzemexabizevef.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/2409976459.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/42768096712.pdfIn PDF document text
    • http://labradory.pl/file/biwimirorexaketosupaxopu.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/63569710113.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/8e54cc9795a3910e3d31e8e39d200328/35523354487.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424c833998c---89394549830.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/xulivikuzujilojebupoxulum.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/161328ab9704a3---34463524554.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/xetulodutinupumowiju.pdfIn PDF document text
    • https://forumsevens.com/images/file/raxipisugapudevi.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/xurovorupuloxadazoxim.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/24333955090.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/47995504086.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFE 10504 bytes
SHA-256: 4aa033dfb9d6a3c74ae9dda240f0f89462372ef440cb638fece6e74bde99e6e5

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