Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc142c23eab82113…

MALICIOUS

PDF

91.1 KB Created: 2021-08-09 07:24:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3fdb874109a30d2f1145258841072e1b SHA-1: 31c2ed8ea299f36c05a6cb3e82be9ff3a1bdd9f2 SHA-256: cc142c23eab821133459fbb9da617d789f961108321d6bc1435898c642fb13bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://archism.ru/uplcv?utm_term=the+importance+of+reflexivity+in+qualitative+research PDF link annotation
    • http://asiavent.com/UserFiles/file///lufiwas.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/tutezuwopirafedud.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f75f8d37c---filonex.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160946ce0d9f8b---wexebonusineba.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7eb816c14f---33966662758.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607099dc642c9---55179193066.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608bec1a4bc65---kugaparobaxozadepuriwaj.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/fipotelebaxojil.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/5e435cc96d1cf7da77b4af9ad800f230/zukodofukup.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/i75lmatq601jtevfldsa2uvh33/ritivapapixowikur.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b168d3e7937---81190086234.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/68529eebe9a1ecd536035307edd3fb43/gisebenitesorepatuwodi.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/tikuxebu.pdfIn PDF document text
    • https://kermanrooz.com/img/files/gelavig.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/tokalulatobifu.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/kidofirokegabeve.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160dad34fc8256---zumodokufipoxibarufe.pdfIn PDF document text
    • http://emeat.ru/var/files/dulixoloporamikowaxetepus.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/1h1pbdsglfmk4fop5m3bftr63k/sagimogapimulosi.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/45038047504.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a0bc95fcc---80263338969.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821bff4545c---dalofiziwenubos.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/44190033140.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/cd02e26346d663662dc614e5e0ca9343/89719494189.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/593913042.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_off0001004b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11862 11236 bytes
SHA-256: 3034a0628b78da0912bfe13f412197c909f9c47ecf6a65464a960811a3b477ea
font_02_sfnt_off0001329a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1329A 16692 bytes
SHA-256: c31cadbe2eaf580ce0f0d04cee329e242890af5a42abbfffb6d4e5ed50cd1567