Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb983dbe2b67bab3…

MALICIOUS

PDF

75.1 KB Created: 2021-09-07 04:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 33915b5af55db49477a8a9fd6bb3dcf4 SHA-1: cf7e2a46a9427b32870e82139904286a2f1f3438 SHA-256: cb983dbe2b67bab3326bfed5dba0e11cc8c5871f4b4ef2f51b87e7f815a130e9
164 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also hosts a link farm pointing to multiple URLs, some of which are hosted on compromised WordPress sites, suggesting an attempt to redirect users to phishing or malware download pages. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612178e38d8fc---pawonijer.pdf In PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/mevasisurumevudigalebag.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1183079350.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/gozumemov.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/12292622827.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/livofapinipu.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/7e2a85996770202ba015c49c648965b3/kesiker.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/933786fa5b630bbdc8540a31a7eece95/zarizamenelukupozuno.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/wusokalexakufut.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/rugelogaxix.pdfIn PDF document text
    • http://www.bash.cl/media/file/refosebogatofesazifediket.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/95125823852.pdfIn PDF document text
    • http://ergakiland.ru/files/files/bolujim.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6722861cf2---sivefodizutinivexuko.pdfIn PDF document text
    • http://myxroad.com/upload/userfiles/file///15008723673.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/roguxi.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e6ad566d1---6982982920.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/gamijunegi.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/87379103491.pdfIn PDF document text
    • https://diphong.com/uploads/63215431444.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/51044556457.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/vemawaw.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a660ccbc734---87939468279.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/35479501334.pdfIn PDF document text
    • https://27061010.com/uploads//files/202108040251222513.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=tutoring+business+plan+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off0000c447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC447 10876 bytes
SHA-256: a0d37ba6f1a70dc04f6b8cc1c44d31bb171e7e3b7476d14b3d710934c877c457
font_01_sfnt_off0000dd15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD15 16284 bytes
SHA-256: c2b51d1e8a157514f61989f667dfe4841b02a7bde11a5e951b7656f4d1e741fc
font_02_sfnt_off000106ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1