Malicious PDF — malware analysis report

Static analysis result for SHA-256 835de9723fa37d9b…

MALICIOUS

PDF

87.4 KB Created: 2021-09-19 22:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 124d8bef72b165c32ff800d94fc55145 SHA-1: 054016e9af0342c95fc8ba2c434b3d7d0d6c2670 SHA-256: 835de9723fa37d9b3a4dde3d3e33fd3993e70c3d0b8333b5e7f335357254da60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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=can+t+add+apps+to+home+screen+android PDF link annotation
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c516c94661---75793514359.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/vogevajudoboraxipa.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322f3c4530f---negizumamameruwudixadom.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/demadogexat.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/19414897853.pdfIn PDF document text
    • http://gajagotour.com/UserFiles/file/fodiniz.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/6d32f3a490548ed029d492f615bc18c3/gefapufadojimoko.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f05a987818---56897241220.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/68569164785.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/kapila.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/vemovifolusu.pdfIn PDF document text
    • http://jcpingie.be/public/files/mopujikelitutoku.pdfIn PDF document text
    • https://hoongnau.com/upload/files/botiporipevileg.pdfIn PDF document text
    • https://orrizon.ru/images/file/mifodamisawawudajudujolo.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/basagoro.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/3211126085.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b13434ce74---nugezitesifewir.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1614141dbbc3c7---velulafuravijalezafedufo.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/xafitumixuz.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/25673215084.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/pakedujuvazakipazuvedirew.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/kerewaf.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/robidegafa.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_off0000f079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF079 10764 bytes
SHA-256: 0946c5d9bb043e077d0919b1d34e2970ff4f859837f8460a7e1dd6d682d4a07b
font_01_sfnt_off0001090d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001211f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211F 17876 bytes
SHA-256: 190c242cdbb9ec411c6267912c7bab258b5a3b12db5593835de6ebb9d410229f

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