Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d5946bb85e37789…

MALICIOUS

PDF

82.5 KB Created: 2021-08-30 15:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3045bde6ebca6e79f2df1ad5af893a22 SHA-1: a48e3e683a1f0f43698c4e8edac9e3c6158d810b SHA-256: 3d5946bb85e37789fa029e8b8b61df049220a27d3bb62965e179078d3a1806da
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be SEO manipulation or redirecting users to potentially harmful content, rather than delivering a direct exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://harryfok.com/ckfinder/userfiles/files/60999462404.pdf In PDF document text
    • http://urgentcarepb.com/userfiles/file/6530942657.pdfIn PDF document text
    • http://fitviewer.de/files/file/vikobukeritirewokofap.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/46332330481.pdfIn PDF document text
    • http://psychotherapie-coeppicus.ch/userfiles/files/55002191676.pdfIn PDF document text
    • http://guowangcable.com/d/files/lilabalunokalon.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607377c9ae945---64229893354.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/18bb2c6336b5a6df28c2bb253ce9ade5/kodute.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/81052997746.pdfIn PDF document text
    • http://status.cz/UserFiles/File/71081925018.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/34301024738.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/wimosufipu.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/80e7e61e68edf5711289d3ec665b92e3/19654932236.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/51491179899.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/74b95da7235a93cd3b80827faef0223b/85722554350.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/64897313297.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec734daaa1---2068727069.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4beda37a70---95954490097.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/59491f4f871d42446df4d92c14aaf2cc/gomadumoparubudinutakolig.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d319615e480---gizinupuj.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/636a3ece70f84ec68b6718c24d74281f/lijizuminunoxenegoz.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/kh8ip4ro47m1eil5hbbkd5bgu1/fatuban.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736b259b496---95878155126.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=nautical+mile+to+knots+converterPDF 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_off0000dcea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FC 18364 bytes
SHA-256: 0258292dc7278d046f05197114a0613898a543095cff99b273ebc52ef0c9d1bd
font_02_sfnt_off000124bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BB 10624 bytes
SHA-256: b6290a2a6c0ffbf47b992ffae84fee38a744c71eb05162dcf81a7fa93e7210ac

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