Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a17276e1aafbb51…

MALICIOUS

PDF

81.4 KB Created: 2021-09-20 02:48:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5913601ec5ef406493af9fc8d3f7064a SHA-1: b912ec71e39149152f354eb97ed15282c56abc1a SHA-256: 4a17276e1aafbb5103c01a74434ffa214c08449f4bd337448bf32a93a65b6123
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' in one URL further supports a phishing or spam campaign.

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://wastran.ru/uplcv?utm_term=pes+2021+for+ppsspp+download PDF link annotation
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161352fd165bdd---3877171776.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/55822552576.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210905065152.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/bemore.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/73761427593.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/kazile.pdfIn PDF document text
    • http://ukrfirework.com/images/file/84805147196.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/danifizisavaxamulolu.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///gasoxuxibudoz.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/woxananizav.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/sikudazuxizadotazited.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/11297187402.pdfIn PDF document text
    • https://geelaboba.dswip.com/ci/userfiles/files/12096111814.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202109060050026770.pdfIn PDF document text
    • http://ipayon.com/root/FCKeditor/file/80321232590.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf9e46771a---2014493988.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16145cde6eb60a---vezopem.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/35649568299.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/71922201141.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/46682645980.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/bf9a97e688b94b7bdc84770cb4d2d26f/22168302944.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/bozef.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613edefa1fa16---jabipalivimasaxofuz.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/90039448595.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_off0000d6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BF 10680 bytes
SHA-256: 8633434069aa4cafe381852029af6ac6ac3f282cbfed1158fd4cf2aee34bedb7
font_01_sfnt_off0000ef8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001079f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079F 18520 bytes
SHA-256: 19f15555603a1983f18dee4a7a02d33a009dd9004bc43ce2edd7068bc0bb8b3b

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