Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a1edfbcaf5ea5e…

MALICIOUS

PDF

86.4 KB Created: 2021-09-19 07:18:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 378e74b379b0aefaeee37c9cd00ae112 SHA-1: a50f34a45a9f816ed69efd0a57ba8ebbd87e9925 SHA-256: 71a1edfbcaf5ea5e2168b1829ba7647c2675d0f52e6219b3eeea46359406af31
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=dual+boot+windows+ubuntu PDF link annotation
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/xutaxujepovufate.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/a22531548a76903ca552c06b922b75d9/pesopitujawa.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/34754515632.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161365bbba1f3f---kurevorabeweka.pdfIn PDF document text
    • https://salwangurugram.com/files/20594800385.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/94948911951.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/jamotetizane.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/59729415143.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/006f476157181d34ee46fce5369c8fe8/lasufelogalijasufilovuvaj.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/49155251317.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/sivamofexojasimeselu.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/suvutilonujaxodomovetata.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/38376123462.pdfIn PDF document text
    • http://nfc.soo.jp/file/ropelomefolafegisivowes.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/witavi.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614321692cb0d---pupefepopejut.pdfIn PDF document text
    • http://svarovani-tig.cz/userfiles/file/95391673500.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/gunurirupuvaxak.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/dozonupaj.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/mozusegoxiseluniv.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/vumixodanoruwujosuzuvuno.pdfIn PDF document text
    • https://emenu.hu/editor_up/60502013722.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614691e46fd22---2004774902.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/tisulabaxejujux.pdfIn PDF document text
    • https://unosms.us/userfiles/file/keloxevu.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_off0000ed66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001057d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057D 10336 bytes
SHA-256: 9215c22742ebd8fd2b103ede0f6060971bcbb229c480ae7ecaa4b7ba21783451
font_02_sfnt_off00011cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF0 18300 bytes
SHA-256: c58670886ad537ed45b8ce9bb0cfb593bfab3e4ba75ef544c20bdbbe51b3a07f

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