Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c75eb1d9295b026…

MALICIOUS

PDF

72.8 KB Created: 2021-10-03 02:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 551083c4998f5e43097e878c28e4fb1e SHA-1: 54f5f1a8ed78ae7a0a70835c9f1862dff5c41c04 SHA-256: 3c75eb1d9295b02652d4ea878330f73594be4e8e84c9bfb05acb3950a215b6fe
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://danfort.lv/userfiles/file/sukubosaziwedo.pdf In PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/54556146501.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/26542129098.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/94963604242.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/4590515413.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/45407013942.pdfIn PDF document text
    • http://mlead.net/images/e/file/rolofanat.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/51203059579.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/26525235074.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16152773229c68---rizazikabubenavirubafabi.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/lifivixevapikaxumaj.pdfIn PDF document text
    • http://santeh.md/img/files/bokesobulod.pdfIn PDF document text
    • https://nusbetaja2.com/contents/files/99147364471.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/zabawotasixapo.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf24359c2f---25417681196.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/14eb868602ba2e26cbb18b5b5f0a5f8d/9117258369.pdfIn PDF document text
    • http://eubeer.vn/uploads/files/89592416997.pdfIn PDF document text
    • https://izometal.net/mm/file/14853281086.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/36207964172.pdfIn PDF document text
    • http://www.siposferenc.hu/html/49226586453.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/82541544777.pdfIn PDF document text
    • http://clingac.com/d/files/zififimovatozinunegasaner.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8e4d7b58f307dbcb2b73ef55827e0d27/tuzoli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=will+life+ever+be+normal+againPDF 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_off0000b7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7AA 17828 bytes
SHA-256: 25774a4550d7867043269ef57677fb23f60b34eb9d1f37c21212de16f3e64c6c
font_01_sfnt_off0000e613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE613 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2A 10488 bytes
SHA-256: d7a4491d4785e5d4e34958de27cbfcc7a4492d5a6c09387e53a6fa45098b496b

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