Malicious PDF — malware analysis report

Static analysis result for SHA-256 edf4d0d7dbc3fe74…

MALICIOUS

PDF

86.3 KB Created: 2021-09-23 00:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2f986269078333b942212e99f20d155e SHA-1: 25aae6d4ffc220ad8c2c5002b6e8d24e3bd535e8 SHA-256: edf4d0d7dbc3fe748d3eae4fb10f1604d2f380a95e0733c8a03891c57ab47f57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate attempt to obscure the malicious destination through link farms and compromised infrastructure.

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://allytemp.ru/uplcv?utm_term=shadow+fight+2+special+edition+apk+download+free PDF link annotation
    • http://millionsdiscount.com/mo_images/files/65096146035.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/vobub.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/sukuludabetusojadivibut.pdfIn PDF document text
    • http://sigmabhp.pl/userfiles/file/juribatuwanixajetopopu.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/sosafukamumam.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613473cd352ab---diletalazolemefokukob.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/16423280171.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/nopozawixi.pdfIn PDF document text
    • http://holland-ex.com/images/blog/file/pixuzibibifomerepober.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/42376289575.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/7918219328.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/gasuxovuseseduvipig.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/28610487941.pdfIn PDF document text
    • https://clubselect.ro/ckfinder/userfiles/files/jusobimeluv.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/28201199812.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/pevoso.pdfIn PDF document text
    • https://kvizek.hu/ckfinder/userfiles/files/fifimetamedujexoz.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/55145563076.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/suditozuvikobasegesumo.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16148f2910b0d3---fesanuxosajotuwekifovi.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/wokiwut.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/1c02300468e6460332db00549c733978/4117332271.pdfIn PDF document text
    • http://195exim.com/datas/files/vemawanelitizigonezo.pdfIn PDF document text
    • https://galaxy-training.com/userfiles/file/16444765286.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_off0000dffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF815 11272 bytes
SHA-256: b2cf70b3f07a562f73117e1fb3bbab4e0bd49cdd53fd7367d3935d0701f22424
font_02_sfnt_off00011269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11269 22236 bytes
SHA-256: d998f7dfa73cec917ca0d808704822d174dafe43f3057fb5f59c11a5b435171e

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