Malicious PDF — malware analysis report

Static analysis result for SHA-256 7232f940a4cf6f9c…

MALICIOUS

PDF

92.6 KB Created: 2021-08-02 01:19:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4570c31de4b8f7c70528ef14c53c91ac SHA-1: d0175d7c915351ba179759a7dcb1920d2a3b0e8c SHA-256: 7232f940a4cf6f9c1a6a44af31accbd5b252973f5d64e075b3f806fc6083bc7f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm or SEO manipulation tactic. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and heuristic firings indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=how+to+make+a+greek+orthodox+prayer+rope PDF link annotation
    • http://sadrainsurance.com/UploadedFiles/New/file/tuzoto.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/85058e691156539a8b94e5d2fc5355f5/ditejifutujejarirefosoxi.pdfIn PDF document text
    • http://tavio.su/files/file/82549150687.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/88484859067.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/37809056856.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f790884f2---nebobot.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace44dde8fe---gosazo.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160827e1eadaf9---xuwamapufu.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/22439395240.pdfIn PDF document text
    • https://faceless.me/userfiles/files/20843434222.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/vitepibejijid.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/69631410474.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210524091909.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609f24b917c37---zenejolov.pdfIn PDF document text
    • http://rgjbreunion.com/clients/6/69/6950e03db8b1ea894755b369f0a03c31/File/73864257045.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/508eca532bc39f2f345fff3c85c18881/76620405238.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/kasutikuvowinulizetubos.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/tivijonamisifepufojinif.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1621367607.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/topuvixiratex.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/taxefe.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/e67162f90d3c15a894aef811d07aaeaa/pudogew.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/0ad59335522f52d8bc930f7ab9bb1d98/vakozuvabutaxonuzeso.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/1ca9c9f98aa779936f3f3f93a6a489e7/39935861965.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF466 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C78 19804 bytes
SHA-256: 4414856efaaf63ba234e7aa66de3a164b37ff894d8ba39c4bd066836f4641c8e
font_02_sfnt_off00013e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E9F 2292 bytes
SHA-256: 72a4a7c33bd4c71205d32904784be7270aea46b98c9d0654a13084210fcd14d2
font_03_sfnt_off000148e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148E1 10812 bytes
SHA-256: 1f4886eda92bc44ae78f982799970f9c689829b37d1e98433456a00401fe816f

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