Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d15046aa4dfab28…

MALICIOUS

PDF

84.3 KB Created: 2021-09-06 09:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 41feb44dad56ac5a544c013af93c26d4 SHA-1: eda9439fd1d1999aff74dca6613990b42e4211d3 SHA-256: 4d15046aa4dfab28a4b320e62216a9b5354b304269e043f600501ecddfcaa25b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting. The presence of multiple external URIs and link farm heuristics strongly suggests an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=zentralfriedhof+plan+pdf PDF link annotation
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/v0j92766nvgnv91cmg3b1t1u1a/99301310269.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/96978278274.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/felonulonitalelat.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/buqs1p0h6ja6b8l8abnvlvqnt3/jujawarelewu.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2f378e768---80672895040.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/18f057ddbd457e3dc41f1df6cf1ee223/18909893492.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5da7bd634---45988807661.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/97898933967.pdfIn PDF document text
    • http://www.kammerpop.de/files/file/zokexoxupedefadukupa.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/3825401071.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/57590735771.pdfIn PDF document text
    • http://alptw.com/images/files/watotexozinigujifa.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/46319918193.pdfIn PDF document text
    • http://umhouses.com/uploads/files/pudonupuziketu.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/9a68b3865e9949ba7e8a86f702cd79fb/16763267726.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a77dd3347a7---jatumakuzogebalugaz.pdfIn PDF document text
    • http://starkhigh1972.com/clients/d/dd/dd83d6d7846a033806cdb512e10d7d7c/File/38975737967.pdfIn PDF document text
    • http://mistralizmiryonetim.com/uploads/file/desoburexipirotenosexiw.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef35661208---pitumojebotimo.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161061c3e77834---rorojisidovibukaxote.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///fewere.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4ae856dfe---xarotabufuru.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/xonimasupakudok.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f47de62834---vivotonipusolazo.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be4946177b9---zitejibi.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/67690078263.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_off0000dce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE7 21512 bytes
SHA-256: a69f28b24998c58619291c232211f94030df4078649007f90976d56d075905d4
font_01_sfnt_off000113b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCE 10388 bytes
SHA-256: 51c0c7680b6de6f163c196e4388a7411cd54ad7cc56dc56b603fc8ff347df82e

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