Malicious PDF — malware analysis report

Static analysis result for SHA-256 c30201b813f81e32…

MALICIOUS

PDF

74.2 KB Created: 2021-09-09 10:18:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 365a7eaa4688ba1f84476f566a4b53c3 SHA-1: cbf5a9a5de693ac3efb90a0967889b58985a6c35 SHA-256: c30201b813f81e322024cc6cf1e327b73db740290d2c602f1d085f80327983c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a link farm with numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://irinaburmistrova.ru/files/mopijetuxovilo.pdf In PDF document text
    • http://parikshitconstruction.com/uploads/85215871608.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/mapimaga.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/foxeluwawolemopafipom.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16136ad60e0eb2---mifukumefi.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/koxovusikanev.pdfIn PDF document text
    • http://chemicalengineers.ie/images/1264092083.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/98959120851.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210909_052825.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340b988a926---91841266623.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/nejatopovabid.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/8794988287.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/tabulawoxu.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/vivinogosivi.pdfIn PDF document text
    • https://sadex.pl/fck/file/60727925223.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/19657412501.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/zimikikowawomisadif.pdfIn PDF document text
    • http://sin-hua.org/userfiles/62634186685.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/sopiluloketikotuliki.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139713fa12f3---tosuvutasanonafitumit.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/4e094f1bb34a06460b6c0c6b8474a544/vimatobodigug.pdfIn PDF document text
    • http://vaynhe.com/upload/files/60594975961.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/91213054809.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+get+coins+from+gyms+pokemon+goPDF 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_off0000bdf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDF6 10900 bytes
SHA-256: 400ff9d96de4ff049bad531fe2917029d176a3e7bb281cd94cf13f6d63021420
font_01_sfnt_off0000d73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73A 16828 bytes
SHA-256: 8da152067bd516d022cefd2ea01552ea49b1f09d466ce53f20d5cd8409722fd9
font_02_sfnt_off000102c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1