Malicious PDF — malware analysis report

Static analysis result for SHA-256 018d38fd32ff256c…

MALICIOUS

PDF

67.7 KB Created: 2021-10-02 11:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 910247218a772a6cda79abe4583ce3f1 SHA-1: b7c447462e6eb33ac808f9f471974f6bc7701728 SHA-256: 018d38fd32ff256c41e21dc5e4020a5acc396ec3d62ab3b3284a06d958046cd6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to various domains, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment delivery method.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://wastran.ru/uplcv?utm_term=to+great+affect PDF link annotation
    • http://sva-jeanroze.com/xmedia/file/ninexewijabapivu.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152a84c29001---90252571252.pdfIn PDF document text
    • http://aotmoo.com/uploadfile/files/20210926_092135.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/93635391501.pdfIn PDF document text
    • https://avukat.kocgrafik.net/upload/files/43179965997.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1614778ef26d7a---89250670951.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/zelazo.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/79984513389.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/67146038458.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/25381972845.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/labijud.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/1c045692c2272afb1b1e20880127d186/getegememowa.pdfIn PDF document text
    • http://wizclub.net/upload/userfiles/file/lomoxajunijowitox.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/85505886119.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/gubogogupotovadapububar.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/41774642497.pdfIn PDF document text
    • https://bczenekar.hu/files/file/6294063390.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/nulofisejorodi.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210905_9CC28E2421550E30.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/dasanelipejenela.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/jijowinopugutapet.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/wozomevozadugor.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_off0000ad24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c53b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC53B 10064 bytes
SHA-256: ba9d5966d05ffeaaad7351781280703ea52272fa7bee16084409e2c8cc16a4a2
font_02_sfnt_off0000dbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCB 15024 bytes
SHA-256: a5af25a16163bd135cc452672b8c3c33540ae30f286aa755118769eba5adabd0