Malicious PDF — malware analysis report

Static analysis result for SHA-256 c93c898d672dcf7c…

MALICIOUS

PDF

79.3 KB Created: 2021-09-12 11:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0bc1d02cc01929a892d89673c3184940 SHA-1: 963ef603c12dea6dccb61befd14eb71c5741e42d SHA-256: c93c898d672dcf7c4b2ab4ca4eac31cb3bda69d31ea889ca20ccbc64cc7efb56
164 Risk Score

Malware Insights

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

The sample was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to compromised CMS uploads and disposable hosting, likely to host or distribute malicious files. The presence of a 'download button' lure further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://art-gallery.mn/uploads/files/bebena.pdf In PDF document text
    • http://agrion.org/upload/fichier/xiridajugezujitele.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/823fa054973945a299db23ff487f2271/25133746618.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133a913d8bb3---23245488142.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b586f495fe---98308464560.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/39653771402.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/29803155210.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/47193030689.pdfIn PDF document text
    • http://iccjsc.vn/images/uploads/files/25600025799.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/retinigeraxukizoruwijinew.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/93608896566.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/57878563402.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/gobaxujulezadusebu.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/ripagevotep.pdfIn PDF document text
    • http://hk-keber.de/images/file/vavizevare.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/32350980040.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/pilejawitowiruvoxuji.pdfIn PDF document text
    • http://happy-land.hu/editor_up/nuzukubi.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/46398131192.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/rebonogigadamam.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/174782a1bcd283051afc80a2cd0f0c00/megerodufit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=set+up+printer+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_off0000d56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56E 16644 bytes
SHA-256: e90c64839a77ceed95f8e52786596d5ec9191297eb31a851745a12a60f3a71b8
font_01_sfnt_off000100af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C6 10344 bytes
SHA-256: da03f271aca600f9f4d0463e283a958b93fbd04beb26f00e45bfbccb80e6a033

Open this report in the interactive analyzer, or submit your own file for analysis.