Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ad30de7e1dc48b6…

MALICIOUS

PDF

94.6 KB Created: 2021-09-12 20:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 43af8ab3b58bb20c4ae7214fa055bf0a SHA-1: e4fe61f3a08a97ace21739ae2a37f370103099a7 SHA-256: 3ad30de7e1dc48b668e217a710dbe1b17d37524c4f4cdcb35ac8ff715485ae51
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://rubfila.in/files/file/norifi.pdf In PDF document text
    • http://riggi.ru/userfiles/file/zulawewigulebififebekox.pdfIn PDF document text
    • https://kstraders.com/userfiles/file/6627603754.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/32949619801.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/borexotiwatalegajesuxova.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/70878589208.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/duketutodonegipawikofus.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fce170ed6a---sabodixamipax.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/xadirujigajo.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/nomogusedidi.pdfIn PDF document text
    • http://ktcz.eu/files/files/4887662406.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/49416547543.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/12772019967.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/44016108711.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3412417c1---nedop.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/35076457708.pdfIn PDF document text
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/nalanoz.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/96103592405.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/81438232687.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/161307c3e3e42e---detusodagedufamakepefuvom.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/57682480314.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/viwixaxaxifupuped.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/wujugef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=krrish+1+full+moviePDF 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_off00010ff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF4 10324 bytes
SHA-256: f4e9a0602a10e0ba6c528a3be602659dcdf63cca4dfcc57ff3340bc076326559
font_01_sfnt_off00012743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12743 17456 bytes
SHA-256: b8c6880ebf57e7b127ca5cec4180768f4b6570b5314198f2af68ae4184e0317a
font_02_sfnt_off000154b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1