Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f9a9d67199ef290…

MALICIOUS

PDF

74.1 KB Created: 2021-09-01 10:16:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: be002660926b674bd689faea6040f870 SHA-1: 9d7c0ce757a5c3f0749593843d4ca13dd02655fc SHA-256: 4f9a9d67199ef290cc20b0aeb0519887727d2d38fa29f7620e13204a6929dca8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. These links likely serve as a lure to redirect users to malicious content or phishing pages. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/4daef98b1042eb3eb194be6420b20c63/17319452803.pdf In PDF document text
    • http://prestizhstroycompany.ru/SITE/files/editor/file/sojuxozivubetokadajora.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/37447947097.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/64732828636.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124810a1bb43---93847644884.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/zedujurirukoke.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/202163124979204.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/65cc250c115ccc940ef52469165f8ed1/selivaj.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/nubugirimaju.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/jakunodekebu.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160842257af1ec---79586047678.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160837825383a9---jovojobi.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/2e8jfcqqe5i5nn2ie8cc4e8gt2/66803077887.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/47104727647.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16089cb428a191---jukozu.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/4odvvfg39p4bdq5q7k1d1t7r2d/wedezopajepofodeke.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe34b9f037---gubofutewub.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/uzudinuvuzuviguxusal.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/povirobarapiwokexufogawiz.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/d2fd94c3a0205f6b557887d190b8778f/lilikun.pdfIn PDF document text
    • http://minerva-collection.net/files/files/54387504713.pdfIn PDF document text
    • http://apvn.info/userfiles/file/zetixivufutirewoxakalaren.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/63737345979.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=randell+manufacturing+incPDF 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_off0000c079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC079 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88B 16504 bytes
SHA-256: 4b424e69b4cc888f68da5ba65ca21bd738baaa05a3430323a606fe35ac7223d1
font_02_sfnt_off0001030f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030F 10676 bytes
SHA-256: 9946313ae9d4dc96952e7f7c7d866d7a508a0b4db32a8350bd31ab98b7820871

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