Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4a6f1783044e892…

MALICIOUS

PDF

78.2 KB Created: 2021-09-09 16:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6c596608ed3d98b81ced38d188fb875c SHA-1: fe75c2548dd1958c70bc2300d307946078764df5 SHA-256: c4a6f1783044e892420949d14954a7418b1a33294a09dba9dbad77c8e7e33be9
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://szekszardportal.hu/userfiles/file/bamadirixalemusu.pdf In PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/zumezajemimovorudak.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/lagabexateri.pdfIn PDF document text
    • http://motopujcovnateplice.cz/userfiles/file/nomujasamatepunuz.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/gipisopasobafo.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/54200282879.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/dakesuzofulogenes.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efb75232a5---71161095349.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210908135443.pdfIn PDF document text
    • http://azinsaghf.com/cache/fck_files/file/semijimuruxaf.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/59192561628.pdfIn PDF document text
    • http://viorina-deko.com/images/file/69081393844.pdfIn PDF document text
    • https://badrivishal.com/media/19805791114.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139003b5a9a6---sokoxenuzorin.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/xoganizuwisivakeju.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/towemerunajitez.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/55024884075.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131a19bb96f2---wiganasava.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/dutagenabegetijite.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/xesolagigisinepavemuv.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/27554769058.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/161385051aa84d---sejipolok.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/gikobopi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=blocking+internet+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_off0000cb37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB37 18548 bytes
SHA-256: a9f5dc0baad30564f5a80de2a36f36221137aa04647631dd32f2c008d23cd620
font_01_sfnt_off0000fbc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC6 10520 bytes
SHA-256: 79184c481e7c6cdb1a1cf45e0a82d3afc01db6939bd93281fb24dacea09974ae
font_02_sfnt_off000113a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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