Malicious PDF — malware analysis report

Static analysis result for SHA-256 21234d8b93e0f1a8…

MALICIOUS

PDF

83.1 KB Created: 2021-09-22 09:21:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ac6439f4e3982d923a290a4181d3cd36 SHA-1: 2123b87d4383deef7d4935fee6d1fb344bc58282 SHA-256: 21234d8b93e0f1a8ebd444348d153fcaff562bff01626ff14e2f40febd13cb56
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised WordPress uploads and disposable hosting domains, likely intended to lead users to phishing or malware distribution sites. The presence of multiple PDF_URI heuristics and the ML_NYX_PDF_MALICIOUS firing strongly support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161427a7d2adc7---vewukilupijajaseregiz.pdf In PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/fakemi.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/56855206267.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/98294602849.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/lubewufibikukizigi.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/vugunomolupulugeg.pdfIn PDF document text
    • http://hueide.com/upload/files/jewavape.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/bk7c1smsd41vofsmq99p99lcb5/ruvugugajum.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/19723042616.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/rutelugit.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63612445928.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc60c84d51---51117507311.pdfPDF link annotation
    • http://hansungidschool.com/userfiles/file/72857183146.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/raduxovamawadudiseg.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/gabibaz.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/355022246.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/zozifegomebuzon.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145b5e607988---wetiped.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/38566240507.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/92644295693.pdfIn PDF document text
    • http://koala-al.com/d/files/putusajulitudorefuki.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/vojubujalelenit.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fe52bf5c4---ropodogawijokutidamawi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=block+hexa+puzzle+mod+apkPDF 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_off0000d798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD798 10624 bytes
SHA-256: 440f10b21163a0958880b8d7a92349db32eeaee98812f3772350a2764aee307e
font_01_sfnt_off0000eff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10809 20180 bytes
SHA-256: d956b6578b3616f6f878f9e58113ca05dd3fb839dcd84b39ae3b9d0ffd9776c6

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