Malicious PDF — malware analysis report

Static analysis result for SHA-256 abf06e391c135338…

MALICIOUS

PDF

70.1 KB Created: 2021-09-25 07:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8154562cedf9d3a388929f16f4194b1d SHA-1: 1096874749bbf365fe4058cf8e1903a43bc2aaac SHA-256: abf06e391c1353384e686ac5cc0404ea2625cfdb2867e8e8cf7c798a86a2084a
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a link farm pointing to multiple compromised and disposable hosting sites, indicating an attempt to deliver a malicious payload. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of embedded JavaScript (T1059.007) and the exploitation of PDF vulnerabilities (T1203) are key indicators of the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://heathrowairporttaxi.website/userfiles/file/80829376381.pdf In PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/gejegexumavovedadujeto.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/65442992019.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/welofubibujowasaj.pdfIn PDF document text
    • http://ping-property.com/user_img/files/rotawerigi.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/kobepogitesiwuf.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142996071f49---gadan.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/julinep.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/dufijesam.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/19229927846.pdfIn PDF document text
    • http://camonetinternational.com/files/file/rosazifigosakamaka.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/92252562705.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/058e0c2ca3b018186c1426f35ea5bc9c/befuvek.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/76839648721.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/xopanuga.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16140bab5c2d12---bojagokupomebuzerikusako.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/jedutekosexoxej.pdfIn PDF document text
    • http://www.ximangsongthao.com.vn/app/webroot/uploads/files/fitalole.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/26848896889.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/25918895059.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/bitij.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/pomegasijelosizu.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210905052008.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/99728344463.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=product+key+for+office+365+pro+plusPDF 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_off0000b0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B3 11128 bytes
SHA-256: 664a748b2142b78c04d3484a5d449f651d69fbd843d9360573d287dae02a9611
font_01_sfnt_off0000cae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE6 15904 bytes
SHA-256: 753223f8ba2649b2faa20c3b7098ab217a954fe0cabaabf4d987d9d762255ffe
font_02_sfnt_off0000f2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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