Malicious PDF — malware analysis report

Static analysis result for SHA-256 da42f2429d9e1065…

MALICIOUS

PDF

69.5 KB Created: 2021-09-26 14:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7cdc3fb8947a42780ab6dc03fa335ac1 SHA-1: d2756035d819e08679c25838058b37249c3926e8 SHA-256: da42f2429d9e106516e7b9f5b1e5dba8d3b673a2c2b3b41b5b878448cbbcdf47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure points towards a common phishing or malware distribution technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://queure.ru/uplcv?utm_term=snaptube+premium+app PDF link annotation
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/bazojuzosemo.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/20919855204.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/radetufatoximoduliw.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/nidawelizejejumuzujonubo.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f40d98691c---15027903630.pdfIn PDF document text
    • http://c-six.it/userfiles/files/42930949317.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/rujinujegonewuzizosezax.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/74933449016.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/23196430646.pdfIn PDF document text
    • https://destockbaby.com/ckfinder/userfiles/files/89396209541.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/mutewamedepusupel.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/82475748090.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/83190404880.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/nogumabefine.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132cee639337---65439772516.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/64217953751.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/juvojamebejojawolajonamin.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/93900351698.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/48741164519.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f57187e31f---69024651535.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/nojopuxoxosokazusu.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/97363233510.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/rowivawodolu.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_off0000b1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1FC 10392 bytes
SHA-256: 7a47bb8ad79ce0eb91caf3413797e4cf515bd2bab56c2791b960faa4d47a9884
font_01_sfnt_off0000c949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC949 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15B 15508 bytes
SHA-256: 527eeff0596be39a9b0f782bc2c9caa6c9d37ab244f0fee33f0d35c1291f1382