Malicious PDF — malware analysis report

Static analysis result for SHA-256 f381513e7717deb1…

MALICIOUS

PDF

87.1 KB Created: 2021-07-28 03:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5b003e64e1054e671392222168475e7a SHA-1: 7487a049d2957def4e3c08e6407f0b4c58c2b615 SHA-256: f381513e7717deb101e0996fa81c299aa9039dfb2719bf04a3c7d49580c930dd
196 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a phishing lure, specifically by instructing the user to engage with remote support tools. This is supported by the 'SE_REMOTE_SUPPORT_LURE' heuristic firing. The presence of numerous links to PDF files hosted on compromised WordPress sites and disposable domains suggests an attempt to distribute malicious content or redirect users to phishing pages. While no scripts were directly extracted, the overall structure and heuristic firings indicate a malicious intent to trick the user into a vulnerable state.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba20cb0bc68---remowejozusuvikafe.pdf In PDF document text
    • https://alajuusa.ee/media/contents/file/pimekulejirelifeselunok.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/xelamarukaxamibojiwudi.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3276a53650---79068360064.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/xudimalugiros.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/76795290006.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/63051798380.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b80eb7b0530---80862501582.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/807fec5ea1618102cfbfa9c927babcee/57406731511.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d405a99e3a---2589932524.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/nikewakezerabaja.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1aa519d9ef---12592985702.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/1d4cj10uuvnv9gtcuk0mdhbtn3/kilawoted.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/11355941651.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/69280843171.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/78554707042.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161000f66e24e3---85970185617.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/damotowuketavozun.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/pavimerusivo.pdfIn PDF document text
    • http://amdind.com/userfiles/file/xetanunewu.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/39312875644.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8eb86a048d---xixarukudulebabup.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/ecc06117d7dfc0e919feb606b296b6a5/94632437965.pdfIn PDF document text
    • http://dgjst.com/upfile/file/nikemimogalokidap.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4b2841b01---diwetimubojujimufaver.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160fde8abb201a---64371230587.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+thaw+a+frozen+sewer+drainPDF 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_off0000f2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B5 16992 bytes
SHA-256: 06eb09cb0a7ac3f27af36665761b030fa31f4958551167a3a2efa3135b615090
font_01_sfnt_off00011ee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136FB 10544 bytes
SHA-256: 79c68242da0482e5df9c70cb702372ba0eb0c756796dc139893abe178a08808e

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