Malicious PDF — malware analysis report

Static analysis result for SHA-256 705cf3ee6346729a…

MALICIOUS

PDF

83.0 KB Created: 2021-06-19 18:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4cb0ca8428efe38d4fe1c2cacb528ae1 SHA-1: 4ef15f43db9b0d7d6cfe72d1c8fe3870024e5717 SHA-256: 705cf3ee6346729a881e9527031c07a0c88c7250287f908c024ad43e14220f34
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ketchas.ru/uplcv?utm_term=spirited+away+eng+sub+online PDF link annotation
    • https://infrastone.com/userfiles/files/wofufenimanilagoxo.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/olubolato.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/mugume.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/zexij.pdfIn PDF document text
    • http://yuha.be/_files/file/gejomiposekog.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab8b3ba6f6---62699859647.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/2adb2a09a7a323fec962b5f2c73dc8e8/18178518039.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/joxomuludafufal.pdfIn PDF document text
    • https://wsbtitan.com/images/file/dezujulunoj.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/mm1qnkunvuuo4pgmi9p3krlnda/dujafagijosudeliwek.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/91740abba9bf7383b22a4f2aacbfa319/55452174805.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/84288321967.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/af9abd05dbc3cae5447109993fae155e/nadurafasarasutupimutejag.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/46279dc3d123ee208a52edfe05bfb673/juwodiniratotenovasufo.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-4-29/20210429024649847375.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072d161ed292---pugizejedusenuwatiwuru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB68 7668 bytes
SHA-256: 97520b4b016850cea9d7ed99b4695e59714e562f00963dbabe80976e519c1f25
font_01_sfnt_off0000f4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FD 5444 bytes
SHA-256: c9162e60aebc99c3ffa4a4ad78c3041596573b687563d8197c122fbd978e35fa
font_02_sfnt_off00010792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10792 11524 bytes
SHA-256: 369f19b30a24b28875569d0661771d067d2647d413653eed798fa5d4c03202be
font_03_sfnt_off00012f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F21 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176