Malicious PDF — malware analysis report

Static analysis result for SHA-256 518a3c3383d29c0d…

MALICIOUS

PDF

84.6 KB Created: 2021-09-01 07:37:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 70930ce5e755c4b8c1850572d33944cb SHA-1: efc87c2a9e669bb87c82b37e71d15a45ffec7f39 SHA-256: 518a3c3383d29c0de14e6c66c74892b4a8948c961e111eed815f2538b258df28
156 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 contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The URL 'https://irlanc.ru/uplcv?utm_term=homescapes+star+hack' is particularly notable, potentially serving as a lure for phishing or malware downloads. No scripts were extracted, but the structure and URL patterns strongly suggest a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://irlanc.ru/uplcv?utm_term=homescapes+star+hack PDF link annotation
    • http://ilksolar.com/Images/Media/files/88368399955.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b854ad4ad92---pepofozirosagofifizalu.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/f65ac6d423f4efd49eefe2118f83f135/dajexilokebojidenetu.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ef191d2f2---rovutekuxina.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/5a93ef7a3aa2c3db6f27707b653affb5/64472976050.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610de94a2d22d---18575083534.pdfIn PDF document text
    • http://nusamulticentralestari.com/Uploads/userfiles/files/daxasudi.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/15518292720.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/gusabodazinaxowaxebaded.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610449c34d636---mefofizinilijo.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/lelelederidetebej.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/kupakaw.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xofozodusiv.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/10341456661.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/ponivobeda.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/59101891480.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/69891059224.pdfIn PDF document text
    • https://gazelletr.com/userfiles/files/zogox.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608099fd44c8a---makiroxamatanapowurunari.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/ralalelinamewakopexotujef.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/38660169604.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1e9ea0d7e---42929103301.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/pemugobipuxesajazosi.pdfIn PDF document text
    • https://dm288.com/slicice/file/28466380065.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/96356681283.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_off0000e4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE2 10480 bytes
SHA-256: 072bd5e4f70ec583b376438e6d82bc0e1d6b0c50df8dd2541999061ce3ab7737
font_02_sfnt_off000114bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BB 17984 bytes
SHA-256: f7aeded8fef76f437b73823ca0dc485a2cc737c750a54177d76bc0eb29d89b41

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