Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bf267aab860bf2e…

MALICIOUS

PDF

81.1 KB Created: 2021-08-20 23:33:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 925a21f4edf9420fa116d52aac4e81c8 SHA-1: ade75710191ef429d307d69247c7beeed3bb83b3 SHA-256: 4bf267aab860bf2e7a7a31d91a2e22aad899079c8a1cfc767665c27a90b7be6d
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous embedded URLs that form a link farm, pointing to various domains, some of which appear to be compromised WordPress installations or disposable hosting. This suggests the document's primary purpose is to redirect users to external malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://chcial.ru/uplcv?utm_term=bksb+english+initial+assessment+level+1 PDF link annotation
    • https://amd-export.com/site/upload/file/80090845164.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/niwotazarofibulidozel.pdfIn PDF document text
    • http://amdind.com/userfiles/file/jowuxusodu.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/bematomodesalejibesafaru.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/c64987de3c1210e512377c73dbc218ef/sapejafetibudijep.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/67762592397.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/36262600693.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/5d09ea4add892b899e1f577e9f3469ae/vavodexulejala.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/goxuvoxexawozojigumulud.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/sixox.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/5446b4aac5a587d0443a96210162e95e/lepepijax.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/vorubulajulurifibifopod.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/28c14160763f2c57fdb9bf8dcc59a57b/mukokirujoguma.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609c82cb64b27---79444379143.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/s9hl8hqqe0irl3psvfuruebaqv/xelumun.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/10129782457.pdfIn PDF document text
    • http://ledins.lv/cms/file/46153951296.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607611c1467a0---filidetimopuwiwekazoke.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/muforija.pdfIn PDF document text
    • http://kino-cosmic.ru/sadm_files/17628207610.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a40bd55a9ab---sefiruzunalimowu.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b7eb3ac41cf---xaxeritiropanoj.pdfIn PDF document text
    • https://premiumtrade.ro/ckfinder/userfiles/files/baxesazuwow.pdfIn PDF document text
    • https://etadelloro.it/images/file/luvataw.pdfIn PDF document text
    • 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_off0000d7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DF 10736 bytes
SHA-256: f0e1ac464a1251784131a25549d780a16a38fccdea6407d3cc6c8f24ccc11f01
font_01_sfnt_off0000f077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF077 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10889 17072 bytes
SHA-256: d63aeb0986598add267136f30ee4ed5cadb881c3eae3949af6e9b70f79bfe59e

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