Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec56cde75bb861cb…

MALICIOUS

PDF

85.2 KB Created: 2021-09-11 06:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0e8fb29ddeacf8c2df5e5046e0111c52 SHA-1: 85db7200d74c412a4d0191fa6789e4a294e50a7d SHA-256: ec56cde75bb861cb4652d1ca7d0b1edbf21a398e22affaed44f8b7d739fd0ec4
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The document contains a link farm pointing to various domains, some of which are hosted on compromised CMS uploads, suggesting an attempt to redirect users to malicious content. The presence of numerous embedded URLs and the nature of the heuristics strongly suggest a malicious intent to lead users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://radekslodkiewicz.pl/files/file/tudaxazaripomopozixak.pdf In PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/43380297321.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/6392f783253832a80ab8df3ec2e07af6/48207518439.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/61316174b5616e75015c454664dbaad5/86481394520.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210905183155.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/rosolivurelatalikasuzuten.pdfIn PDF document text
    • https://webhosting4.net/media/file/narupilo.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/mitijadujukebi.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/77877230785.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/nepawofobepej.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/nudavalafuxexuvoratoke.pdfIn PDF document text
    • http://popeyebio.com/upload/files/xejidapamibunaluga.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/41944516888.pdfIn PDF document text
    • https://bataretak.com/img/files/file/togagaxobaritogonabe.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16135c1d920026---luneginaselev.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/37686128098.pdfIn PDF document text
    • http://africareview.in/userfiles/file/34759481656.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/vilinudanuromiride.pdfIn PDF document text
    • http://htygroup.com/upload/files/vumosu.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/27803880778.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/49054948577.pdfIn PDF document text
    • http://weldingplaza.com/files/file/velubobetomatun.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/tejixa.pdfIn PDF document text
    • http://paneldeconso.com/userfiles/file/xivavetirofopimubuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+change+profile+picture+on+facebook+on+androidPDF link annotation
    • 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_off0000e31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31B 11140 bytes
SHA-256: 23c96a92ecca6ddfe23507c3f9a84af5044dc081c90ce7e5553e319fdd64f4fc
font_01_sfnt_off0000fca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B5 19048 bytes
SHA-256: ce0e4d09976c9518c5590e45a905a38007662e987f41734d6076b07d5b1a503e

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