Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b4db4836bbf3389…

MALICIOUS

PDF

79.4 KB Created: 2021-09-01 16:19:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3d9d1bde0d8dd8211e82cc406e789c3a SHA-1: 96af7fcbc85abbb8e3819687e0a0b5e5e7d5a598 SHA-256: 6b4db4836bbf3389ecdd2cf39a9d6f38b557434ddc42ae2d4224c7045e699d19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • 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.
  • 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.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/18e1721fud3eaqucr0qm74da33/pivagubuxoxezotu.pdf In PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/pevakudefesotaxoj.pdfIn PDF document text
    • https://suncables.co/images/file/potufaluzutejadewafiri.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/ha14807jnk6cbllup0e0gs56jb/xefegudimivofobovadiri.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703edee578b---77120329709.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/21605309347.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/5e428fl8vbvhuutpp31jnlmb7l/jojasizumexafomika.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080546b9a3c8---78771355055.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/597f0571352b273757cff88418899efc/37551822850.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/50591148410.pdfIn PDF document text
    • http://ohstigers66.com/clients/d/da/da15611725e7ba20b6827cbf2e24f87d/File/52540412330.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/41fc950e1ef5fad2a94351c23ad68d78/48155692006.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/92261403053.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210816164921.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/l0pipjbvh6196e2o71a1nv4fj0/67204393733.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/10176502507.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/5736a2e618ba66989c71fdb35980a028/sufafifu.pdfIn PDF document text
    • http://staropolski.net/Upload/file/nibobeginabujenigokazibuv.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/kinatuzalesojuze.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/36033605913.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/6d8b4da9a4371331c03a429f935dd077/92552078144.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5ef2728e9---vazilaxa.pdfIn PDF document text
    • http://polipack.ru/content/file/52407231774.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=svg+hearts+freePDF 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_off0000c8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C3 21248 bytes
SHA-256: 47670343a3f0fc6b2133837eac59759925371ec19bacfae368119b7563db7e92
font_01_sfnt_off0000fee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE7 10272 bytes
SHA-256: 7a1aed3ea4fffb6d49fdee04831c73f792d950af69209075723c6a609a09db23
font_02_sfnt_off00011635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11635 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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