Malicious PDF — malware analysis report

Static analysis result for SHA-256 45054cf886db1431…

MALICIOUS

PDF

81.9 KB Created: 2021-09-16 16:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 85f43e2053a370db418940e4ea9d1591 SHA-1: ec4adf9e382d95007fb2a53be04232bc310d7c90 SHA-256: 45054cf886db1431a1599b9bf1987696ae2d2a15924f75045f1b35e4d04e4131
164 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. It contains numerous external links, some pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://garglob.ru/uplcv?utm_term=market+leader+intermediate+3rd+edition+answers PDF link annotation
    • http://elisa5888.com/shopadmin/upload/files/80885864019.pdfIn PDF document text
    • http://compsult.net/userfiles/file/xelowexumuvamivaga.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/xovasafowujulefomin.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/bemipe.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/53402677961.pdfIn PDF document text
    • https://digireg.at/upload/xubirunubelefewowejur.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/wadamori.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16142f3fab19bc---71985678603.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/xuwivevigapetexajajakotis.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/fogowokulidurelilupiwe.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/peviwoj.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/698974827.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/f6227194ba1b78312211a630ea7e359d/65035735140.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/76965748698.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/88402474309.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/31472656948.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce22f057f6---womizinebaxopisigipepazof.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/68613016759.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/ditomajilelox.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/wifevalepikodatiriponif.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/52d65d089cf436744f3b2c6cc538a9e7/35421352374.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/73561516208.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/bujulomovoxajedumolule.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/senukonewu.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/moboni.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/rasawupofetomij.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_off0000dd45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD45 10752 bytes
SHA-256: 6daf074fafeb55c97547f67527ab34e7a990a8fd89098c344435a7466b41fb75
font_01_sfnt_off0000f613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF613 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E25 16676 bytes
SHA-256: a3e183846e15c25552cf5cde52e85329b0e1f8563c11dbfc014f2294a735d800

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