Malicious PDF — malware analysis report

Static analysis result for SHA-256 78cbd4e09ac26b69…

MALICIOUS

PDF

93.2 KB Created: 2021-08-01 18:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f69fa57b23e884fcccc53559e153a764 SHA-1: a1c2303cc743f1267a5cf9a37a31399a92f34a7f SHA-256: 78cbd4e09ac26b6994ca8c0727cb80c3f00b17f29151d3bb1ee043dbea95eb11
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that likely lead to phishing or malware download sites. The presence of a 'download button' heuristic further supports the lure-based nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/qoek1fen9n6vdvni9bpc8bld8k/ninupu.pdf In PDF document text
    • http://nktrading.qa/file/files/kexorexogovasumawo.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c21a5881d5f---28833771447.pdfIn PDF document text
    • http://sfera-vlad.ru/img/file/woxuwajuwu.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c6675b83cd8---86190912855.pdfIn PDF document text
    • http://ausafe.net/images/art/files/69278709081.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/miguxemixaxawe.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/34680956819.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/gapifubininovexovonorem.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/d33a0476da157d91570d60c3dba1b181/loniwavivaf.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be50194e1a9---20224499761.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/63b4de0de4c0a7f7330a559a402427af/69137234616.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/57366911503.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/623508e3ae680b4e51d064a8cc461dea/29712388970.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/95782493805.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d5ecdeb0f91---xajos.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/81720390766.pdfIn PDF document text
    • http://ezibra.pl/upload//file/24651687697.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/27051898954.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/rizevaj.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/4d882c37cd98c6cf4e5f9b8556008a64/muponuxififesupodegokob.pdfIn PDF document text
    • http://cartopack.com/Images/file/jegan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=citra+emulator+windows+10+32+bitPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EB 18596 bytes
SHA-256: a95d474a47cec3c82555872fde303274aa120ea723bb454896cec0411df0e6d5
font_02_sfnt_off0001354b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1354B 11232 bytes
SHA-256: 5b12a0967bfe04455ed34878160f2d82f0233d9d63c6e12efb1812fde07047d0
font_03_sfnt_off00014fc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FC8 16416 bytes
SHA-256: a8d1e34bf444334761db8dd673e30599a677bf9ec537d4b136fd145dfe542046

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