Malicious PDF — malware analysis report

Static analysis result for SHA-256 6641a169b022074a…

MALICIOUS

PDF

79.1 KB Created: 2021-06-13 10:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c66b2b84077805721179245680e9a55f SHA-1: 9001f0cc41e7cb575f262288a4a3099f440bbcba SHA-256: 6641a169b022074ab90a3b58ea35bfbfa0663db6781b9a816f2d62944e4b5287
156 Risk Score

Malware Insights

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

This PDF document contains numerous links to external websites, many of which appear to be compromised CMS uploads or disposable hosting. The document's content, though heavily obfuscated, suggests a lure for downloading cracked software, indicated by the URL containing 'internet+downloader+full+crack'. The presence of multiple suspicious URLs and the ML classifier's high confidence score point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=internet+downloader+full+crack
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210605_76C95A84A865A637.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/f1489515dbdb501c9f0c8b283c841943/xonilajalej.pdf
    • https://hiddencliff.kr/FileData/ckfinder/files/20210609_D2249E3439D0F939.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/54443220428f7f900f04be4bd5870842/3572227600.pdf
    • http://interwork.sk/userfiles/file/56476881393.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/7be5b865843cfa8ce224606f5f7a0e01/89941669822.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/khkeo7r2t3dd71moafrto7nqf5/kofipefemalile.pdf
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd202a4395---90981519225.pdf
    • http://guides2alpes.fr/uploads/file/16790560884.pdf
    • http://ehomeforeclosure.org/images/file/83769585363.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1f73e66c4---pedijawama.pdf
    • http://auto-spec.ca/fck/file/vogol.pdf
    • https://lasanisports.com/files/68534616068.pdf
    • http://tubietelbar.hu/uploadfile/26330564251.pdf
    • http://bahtiyardishekimi.com/fckfiles/file/27486035260.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9b9.bin
ce6c054bf7002f4c28f99aeb92ca8852ffac71fa69d863e58a2d1ff04277a6a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B9 4932 bytes
font_01_sfnt_off00010aab.bin
0647f96fb8b1823a1185d4f3c26da53d9d85947e844d93bbf0e8a21f85a7c69d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAB 10944 bytes

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