Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b9fb94cb39fde20…

MALICIOUS

PDF

72.6 KB Created: 2021-09-18 10:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3e9c5dbfce34089400c0361090a7d612 SHA-1: 62eb01dd1c610f7957a0a8a9a36d53c95fd6a8da SHA-256: 7b9fb94cb39fde2037478707531a608310f70752705aae78581c966508684383
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm designed to redirect users. This suggests the document's primary purpose is to lure victims to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.videobezopasnost.ru/ckfinder/userfiles/files/rupapasevexejo.pdf In PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/082c207aad8c7366c91344d9d2255ddc/86408680304.pdfIn PDF document text
    • http://moristas.com/userfiles/files/29850851066.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210903_141015.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/dokefaxuwamugowitiniduf.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/94916737766.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/vuzarewoko.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/62724771332.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/jizevifetipamozokez.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/10818477670.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/disekisuzolak.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/bupikimisafimujinegurefex.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/nanawibigidenilijazeze.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/kifuvatebimumoxubiwawes.pdfIn PDF document text
    • http://wsm.hk/images/files/gojonenagubexovajirefu.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/xepefixizikexamuri.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/46843741d5a6c8e9ddb912841e8b952a/wuxisipe.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/lupobotiwelobolupezexeb.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/53176596115.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/jetokepidikubogafeme.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/49892645238.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf1239b3ca---27062733110.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/jusamigitobaxepigerasefu.pdfIn PDF document text
    • https://vitanov.rs/files/janumukowirabazuwoba.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/lixawulewe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=n+track+9+proPDF 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_off0000bb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB97 10060 bytes
SHA-256: eae459de97072de79e281fdb00918e3d686cabe3532d45f3a9bd1f435e9f5204
font_01_sfnt_off0000d22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22F 16756 bytes
SHA-256: 820e01c72042317f289e32461ff0f2ead0cd3a8be3673d525f503893ae58db79
font_02_sfnt_off0000fd19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1