Malicious PDF — malware analysis report

Static analysis result for SHA-256 04802f4c5a3c6a4d…

MALICIOUS

PDF

86.5 KB Created: 2021-09-20 12:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b8780b9caab8c7ca0eae202ff3a8f972 SHA-1: 6abdab5c3c11da3b9019bbfb443d61d2dbd464f2 SHA-256: 04802f4c5a3c6a4d1ade6e627f5b41a2ce9e9929325b87909225845fcf79bcac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://cructi.ru/uplcv?utm_term=boomerang+snapchat+android PDF link annotation
    • http://movesearchesuk.com/userfiles/file/86794725592.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/90158734662.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/jobisewixepefisofixewa.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/58475254184.pdfIn PDF document text
    • http://rayanchem.com/d/files/pazisepoxosexedodugo.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/72517140872.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/pujajijubakujulipapimoret.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b620b66406---51730962080.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/89011726303.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/fuvagaxabuxofarabogivat.pdfIn PDF document text
    • http://navrattan.co/userfiles/file/79540833132.pdfIn PDF document text
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/51668974487.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/22217595382.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/23cc7662cb0439658af9acb9ba711bbb/79181332652.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/81768791006.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/81288058215.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/9250983395.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/44756a737e3bb996a57b1469180d7c9b/norotewovusijiwuvemowares.pdfIn PDF document text
    • https://halkapsikoloji.net/userfiles/file/zazobujago.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/46124193601.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16136909eb9d95---60431704233.pdfIn PDF document text
    • http://roocenter.ru/upload/file/gukokidutaribokuboruwaji.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109041421305970.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/dozude.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/vobixitin.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16146821aab53c---fukakuwifunavamasi.pdfIn PDF document text
    • http://surestegc.org/documentos/file/59728731904.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_off0000eb75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB75 18516 bytes
SHA-256: d6deaeec5f29c0e3614e0fe7ac5bfc2edd8002acd91a51aa01c6e2607396bf76
font_01_sfnt_off00011ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E9 10968 bytes
SHA-256: 4f5987f127d932948204001c848dba85d07c8d227f547502704c9e543a23ae4d

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