Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a2454f2cf8256bf…

MALICIOUS

PDF

82.7 KB Created: 2021-09-13 11:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: db3c34e4702862d6d6434c30e48088e1 SHA-1: 4b7978b4f57ec5a27075cb3d5611890a4f03b0a3 SHA-256: 4a2454f2cf8256bf95773b1d0c8ce02bb8b6feddf7cd4bb191621e0a655cd897
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=best+free+tycoon+games+android PDF link annotation
    • http://ovecollection.com/royal/admin/images/products/file/24835428828.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/86518488226.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210909080637.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/sunazuvo.pdfIn PDF document text
    • http://roleco.pl/data/aktualnosci_imgs/file/88093577648.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/rikesopukarukemogadi.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/63177288011.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/35296276027.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/sarerabimuf.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613616a840c6a---pobisarisijak.pdfIn PDF document text
    • http://4bx.pl/public/file/79694330071.pdfIn PDF document text
    • https://akvaguru.hu/user/file/98393563720.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/lakubivuwufisejufiviwupi.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/kulosomexelewume.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/89647558538.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/kazurojaroreposaxi.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/59635348939.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613414c9aefea---sififotevekumasuvomenezon.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/76ef83586551627ca22e74821ed7be7e/jijorap.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/30622890643.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/31136390487.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/wuvigukodarigelimaviku.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f8b0ee10b---31197259035.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_off0000dff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80C 10940 bytes
SHA-256: e669f9f88c4116aac5772d767da24612ae72417e6ff6c1aafe3ae3e5a913e29c
font_02_sfnt_off00011148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11148 17156 bytes
SHA-256: 1e763904a4b1cb4254bc9703c745a7f338856cb41f47a3a4edd3a010384e3fc3

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