Malicious PDF — malware analysis report

Static analysis result for SHA-256 633700aff8cc9d45…

MALICIOUS

PDF

97.7 KB Created: 2021-09-15 18:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2862c04ef14496dcdb602f7658454154 SHA-1: a37f051503b805822a197182f688b5d13cf6f44c SHA-256: 633700aff8cc9d45ab0b7c415a61e135c0018b14063a872a0325bde683d1c8b9
164 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 disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://mrdak.cc/uploadfile/files/semufurorudome.pdf In PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/31296715438.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/dawesodijovuluroranati.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/75258500226.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614129867e6f5---75374235001.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/24082911706.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/76598556075.pdfIn PDF document text
    • http://cochemical.com/upload/files/58922816593.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/adc6960084a46ae08c1c3700ee8e7ee7/midumub.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/20860009377.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/loravozopupigixevati.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/sulemimizutog.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/gidalajeduf.pdfIn PDF document text
    • http://synphabase.ch/upload/file/90063895759.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/66054085324.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/21408288731.pdfIn PDF document text
    • http://graficaeformazione.it/userfiles/file/53371496937.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/ae971e9dff857ce87f5e8f616b52b138/gekogudirelifalumerufemu.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/pipabejirogabufupa.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161373f0af143d---41643673275.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16134614cb2573---4325649051.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/40616836229.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=get+v+bucks+in+fortnitePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000113a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A7 20000 bytes
SHA-256: ac58166c68b070af60b5ee0a0709458fa2aefa41a1b6141207c95d1bbb4d0291
font_01_sfnt_off0001493b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1493B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16152 10560 bytes
SHA-256: 7f6e0ad5f5642888eac8a57daade3e1f668144d5a400005b04fbbcba00d0f6f6

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