Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac4b33866a16594c…

MALICIOUS

PDF

90.4 KB Created: 2021-08-07 00:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7bea9c67c94e49a2ae18668313dcd29e SHA-1: c45cb7eba8b1bb46c241d6667a424fc67972c991 SHA-256: ac4b33866a16594c598f47beed95cb4e4755ed560ec9797c2d7f5559af40dfce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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 http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a443ab3e40a---30892290135.pdf In PDF document text
    • http://okmarin.ru/userfiles/file/vilisenetizoju.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2a799a2ce---94486220653.pdfIn PDF document text
    • http://ebanksunited.com/clients/7/7d/7da19d52c1086e69e61582739ce98a0f/File/dibakiwaledit.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/kosanilabusetasokufitax.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/ff4ebb0bb1cfaec61b41a2242b63e10f/vefakemifobeboku.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/4b7df76f6f1b3810fdb700b33d9fdee5/vixagikor.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/32145778897.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160f8cab25ca9a---72573804666.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160e76053d0ba2---56428945926.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/36572209298.pdfIn PDF document text
    • http://billsky.ee/files/file/peveso.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e015b772456---jamabajidifen.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/zinakiwabulumijavogu.pdfIn PDF document text
    • http://lws-realestate.com/userfiles/files/36422754055.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/65603512034.pdfIn PDF document text
    • https://prosperitas.be/data/assets/file/21180380148.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/wejepowokejodojokuwudodu.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070fea5906ba---mulerodifimeratezarog.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/q7pk2qg966i6k8ns036jkt63ri/nofatoj.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad37376bfe2---18063441828.pdfIn PDF document text
    • http://areaarchitetti.com/userfiles/files/luvibimajagapewotude.pdfIn PDF document text
    • http://upperdublin1970.com/clients/3/3b/3b2fb281f4756d03d37a29c41a8c1d95/File/51087278815.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/wijasinomusujifiravisaj.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/8547fa4hsf322fq6989mhsip68/fiziwufitojowunumeleke.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/tudipolafag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+reset+dstv+now+on+smart+tvPDF 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_off0000ff10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11722 16988 bytes
SHA-256: c670e00a318ecf28985c959e997c995153dc3032fc714924720a23a5ac05b1e3
font_02_sfnt_off00014372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14372 10416 bytes
SHA-256: 1da3518ba1a43ed9e8b3fca2e86fd4c26d13d03b04ef0a2decf29b8ac5054d9d