Malicious PDF — malware analysis report

Static analysis result for SHA-256 9447cc5cc5338890…

MALICIOUS

PDF

80.6 KB Created: 2021-09-17 14:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5f7c3963b4e873947c11afbd7f605b99 SHA-1: 8ef6152933e1868d80d923eaa60999b0ba666f94 SHA-256: 9447cc5cc5338890b7104d0621f9ed755d4507a223386a3f7e611e594e6111e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially compromised WordPress upload directories or disposable hosting, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://msiutilities.net/documents/xilewigewamoxojuvubikaz.pdf In PDF document text
    • http://nanopena.cz/upload/file/29728568374.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/23234057110.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/86251034300.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365c4a7819b---37022557240.pdfIn PDF document text
    • https://epiphanych.com/images/file/bazutupe.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/zonibi.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/zepoxuxanukujotoli.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/52896272254.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/23881079947.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/ruvijiginojakurulixe.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/somebodasumufaxeda.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612feeee1ed90---96317647452.pdfIn PDF document text
    • http://khachsanmyngoc.com/upload/files/xumojupive.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/lonotevamisubusu.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/gagafodinopub.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/gezipidolo.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/zegiz.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/94542198844.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/77tfg39o9m66mun0800056ctfs/terumidudavobatiwumuko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=viva+tv+app+downloadPDF 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_off0000d7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DB 18176 bytes
SHA-256: 5e58a1db72eef1aa52e4033cfb2ee49976e19e8562ad8ddace4915eab01b7f37
font_01_sfnt_off00010669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10669 10104 bytes
SHA-256: 30e230ab7fa5ccae50586cce1839ca3d67406d85dbb9d93733a143e7d13a9152
font_02_sfnt_off00011d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1