Malicious PDF — malware analysis report

Static analysis result for SHA-256 67cb0c5fb080b147…

MALICIOUS

PDF

107.5 KB Created: 2021-07-21 23:28:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 55a1a21f55c086b193ba86ff016592eb SHA-1: 0b947e5782f7ba8411479cdb98e13272686613ae SHA-256: 67cb0c5fb080b1474dbd70d407b3f45cc8799ae61553f053485f59315acc6263
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://gyobel.itpublic/file/fitevutedis.pdf In PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/87bdb578c93b09d0efc48196caba4c99/25184996033.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/pariwenijeletot.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/ccec29f54347fbe98120b86095008acd/moxivizapavekiwu.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609862a87d6f9---13452703473.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/suxex.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/56927742834.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085cda73502a---57215559158.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/9836c89c593eeca1104f8314bf70ad12/52957971140.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942cb5474bf---kalufadixaduwifimuwanu.pdfIn PDF document text
    • https://bczenekar.hu/files/file/kifedewumakepazavuzutogu.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/40115366146.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/1322556039608c0f151118c.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecec01dabc---84197388603.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160cbe5d90e699---47024501002.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/74059603640.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/fepimiko.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/68e13a177cb7852cbf427b55da7c89ad/35840916678.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/8s8420q51933hg029qr80bobju/86201623440.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=black+and+tan+short+haired+dachshundPDF 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_off000143e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143E7 16948 bytes
SHA-256: b55abe2bb703f159acb0b16a261235de54535310baa23571ac9abbef1d43dfc8
font_01_sfnt_off00016fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000187d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187D3 10712 bytes
SHA-256: caa9e0fe5f99dd7adbb1a3449d51616391de9019a665830492da230aabd0d4b1