Malicious PDF — malware analysis report

Static analysis result for SHA-256 a26c804e2dc8a202…

MALICIOUS

PDF

83.4 KB Created: 2021-09-15 11:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d220c0fe053be4463aa7065bd1ebe741 SHA-1: 96b863d94c9a3551b1a19e68b8736af05564c8b0 SHA-256: a26c804e2dc8a2025f28f6a9905c4f1bb93a67ead55448d22c0da33c3ec72a52
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by a machine learning classifier as malicious and also detected by ClamAV as Pdf.Phishing.Trojan. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'Powershell' tokens in the document text indicates potential execution of commands, likely to download and execute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://krisoc.ru/uplcv?utm_term=play+store+app+install+for+windows+10 PDF link annotation
    • https://lensmam.com/userfiles/file/75756105716.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/wevumoro.pdfIn PDF document text
    • http://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/71455289564.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/2977013654.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/podinarobulepukas.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210913145913_809292461.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/fawawisoxa.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/dikawako.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/sumawodeduk.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/65230446777.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c643947844---nopeguroxalexipalukozobu.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/20346773940.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/popitekubisadukalifu.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/61695122580.pdfIn PDF document text
    • http://zapatosperezcabrera.com/ckfinder/userfiles/files/duzem.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210912_140649.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210914140141.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613a05c90c95c---50699057355.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/bawizewuledabif.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/zenavag.pdfIn PDF document text
    • http://calisnt.com/uploads/files/36462988146.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/2d67fcfb1c0b88b74f3ea7046a18e182/zatalidexakowizigetojufiw.pdfIn PDF document text
    • http://sbairs.com/datas/files/81615341353.pdfIn PDF document text
    • http://dworbieland.pl/userfiles/file/37680644352.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/98a455e87d90683cb26eb7133e42ba32/51264366298.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_off0000dcad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAD 18928 bytes
SHA-256: 76c1d1410c4150e9e7d450d0c1df8aa27515c27ea7f17bac7301174b8e1f2483
font_01_sfnt_off00010e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E08 10864 bytes
SHA-256: be042f0f3143c5a98e21eaa777e5ea318da21ab87fe0cf523dace0baa912df4c
font_02_sfnt_off00012764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12764 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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