Malicious PDF — malware analysis report

Static analysis result for SHA-256 947ee1aba3656f29…

MALICIOUS

PDF

82.0 KB Created: 2021-09-19 11:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 58d6bd68534922a77bf7a03105b4c037 SHA-1: f6274c915f2ec4bb311983112e4b4c508af63d55 SHA-256: 947ee1aba3656f299ef14ae82634ab405c66ee6611004ce58e5696a86f1fcc70
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. The presence of multiple external links, including one pointing to a compromised WordPress upload directory, suggests the document is part of a phishing or malware distribution campaign. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the lure of a deceptive download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/uplcv?utm_term=where+is+the+download+app+on+android PDF link annotation
    • http://tahyuh.com/uploads/files/202109031020171673.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/81786800012.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/16273536717.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/50810783064.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/20219191149366079.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b056fd21c4---nakupud.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/64332950641.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/nokep.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/lumesesisapawurirona.pdfIn PDF document text
    • https://asi-filter.pl/files/file/53987201853.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/16656838075.pdfIn PDF document text
    • http://iknow.pl/files/file/werekinekofa.pdfIn PDF document text
    • https://tekmaker.com/upload/files/56603363202.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/48901388940.pdfIn PDF document text
    • http://machulski.com/public/file/52775336038.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/xajirabudijedobatoso.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/25449171648.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/96a79b09b203aa791ecfa3499c3995ec/nojoxonuvu.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/417467982.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109131706405820.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/fugukurajagatal.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/99176606241.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/verelusovavow.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/69585974506.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613802df01bdc---89687434538.pdfIn 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://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_off0000da5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF270 18548 bytes
SHA-256: 5627416cb905de27932ea5e50dce2b7caf5b8a0ea64f423655a75bd0d66ea7b6
font_02_sfnt_off00012228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12228 10568 bytes
SHA-256: 58b81e636df0d90f94e99bd60afa3930690a8817c8674724e22a9470810142e7

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