Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bf1728ac4060aa3…

MALICIOUS

PDF

83.8 KB Created: 2021-09-16 13:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c13249505883aa2122af1e9195fc9435 SHA-1: 1fe5d7eacdd8a6425c727fd90f6a105d8498189f SHA-256: 6bf1728ac4060aa3f8c1b079a82fc2c19c569f3c83b75bb49ffaf82a64068ef4
96 Risk Score

Malware Insights

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

The PDF file was identified as malicious by an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of numerous links on disposable hosting further supports a malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 5

  • 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://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec31616a26---gejimebeka.pdf In PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16141f448978bf---wapukirelekozibapudunili.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/jatuxideluvedov.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210910144344.pdfIn PDF document text
    • http://vedepcuaem.com/luutru/files/tonifobametipixakemuzifum.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/zudixasudagolazelizojomim.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/mamowigufol.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/15897737014.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/057f3cb6cfc2ca92a8e7523c47567c0b/dademudugut.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/sm6tujabh38djco79ak8nrgjuh/fidifarerunumugujazemus.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/96276551519.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/waritakit.pdfIn PDF document text
    • http://cortabellanews.com/userimages/24725132000.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/17361912483.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/takenemopi.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/zabibexupulowi.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161405066cb05f---60341567910.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/linunolarujatefabu.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/napoxufojekisozewolope.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/mavij.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/15d55e598dc63d131cb16dd586ce23ed/lotokizamapukekogaw.pdfIn PDF document text
    • https://kham.vn/userfiles/file/80160149066.pdfIn PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/16813248311.pdfIn PDF document text
    • http://quetthe.com/upload/files/boxuvigerukudokuzim.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-16/20210916072724990696.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/29104439353.pdfIn PDF document text
    • https://friendsofmultisport.com/ckfinder/userfiles/files/82508308628.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/1559642000.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=android+bluetooth+too+loudPDF 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_off0000e297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE297 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA9 18500 bytes
SHA-256: 6696c13afb9438febb6e1bf746eb20ecf2869b4aa923068d18a734397d42eb0c
font_02_sfnt_off00012aae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAE 10236 bytes
SHA-256: 99da491e18949d49bf3dd985d761b464015acadb80ba953e9a812a78f39ccc98

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