Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ccd2785c8beb155…

MALICIOUS

PDF

82.5 KB Created: 2021-09-02 20:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: df69ba7f266a1e81af03ba36f6dd9796 SHA-1: 27d425dd9a196c88e9bec939ed507d316f8c769e SHA-256: 1ccd2785c8beb155c6b9c7ee9847c4ea68f58e67c1a3bdb404209ef76b2c32f0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The sample also features numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae3f9af767---84376038551.pdf In PDF document text
    • http://giustizianuova.it/userfiles/file/12780280022.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/2759283123.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/74e34a7ba3438487208da3476b29c3f6/40388084685.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/90552006497.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/96977002202.pdfIn PDF document text
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/2400771089.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/05adf2ef1ab5097ab5448260d29f9553/xetofiwigum.pdfIn PDF document text
    • http://come2menorca.com/images/file/kotelaku.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/danebujavufakotozezanu.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160844eb031a49---dumawuforosuxogigap.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/22620219637.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/34135979000.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/14554143933.pdfIn PDF document text
    • http://sushibelovo.ru/files/61397936607.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/62046702704.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/rokuwibalisa.pdfIn PDF document text
    • https://langumeistras.lt/i/File/pikugejetixaberif.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/uj3kqmq9cv4da1nde0j78lkub8/mepodifubupuvalosaki.pdfIn PDF document text
    • http://wawa757.com/uploads/files/rozenexexipesa.pdfIn PDF document text
    • https://bkht.vn/userfiles/file/piwigiliruwib.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16077aa4e10c6d---ruxodakezuluvelikezemiz.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bf489c6fbf2---binivo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=stool+analysis+interpretation+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_off0000dd48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD48 17956 bytes
SHA-256: dcf6ce348c21c294fe0d0fc8ac4ff3fee0243789d4d02a32bd21c349d498f1f1
font_01_sfnt_off00010c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001243e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243E 10680 bytes
SHA-256: 9a1a841fce0cd123da3fb4fadadb9298ae55ee2a8b52fadc041ce03edef75b0f

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