Malicious PDF — malware analysis report

Static analysis result for SHA-256 da8cc5a3dab4667a…

MALICIOUS

PDF

70.1 KB Created: 2021-09-26 23:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4354fbb530d89678af2dfce18136dbc7 SHA-1: 9491e44f1e608beb86f705cf7c386d5934a3744a SHA-256: da8cc5a3dab4667a18ef85a3aa45f7cefd389876ed3d00c90a7843a9917100cf
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and the nature of the link farm indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138132098fa3---tupapef.pdf In PDF document text
    • https://marblobathware.ph/app/webroot/img/files/17278289634.pdfIn PDF document text
    • http://sb-78.ru/files/file/xiwavuwofoj.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/ponamaxozekixo.pdfIn PDF document text
    • http://woykoff.hu/upload/file/17061158671.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/mliqf4r8gl6unt8epm1cp0ovp7/45169915140.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/wetaxepegipepunuguwo.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/nekewewekirogefikevag.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161469f4ddbb14---biwowirofoterer.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613361e1457db---zedakesuto.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/gazenitanigike.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/wosafibuwukutosavaku.pdfIn PDF document text
    • http://poorclarescork.ie/images/25213692946.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/nujezalivovotoj.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/59375775912.pdfIn PDF document text
    • https://marmetal.cevhertemizlik.com/userfiles/files/pikisirunitoxifovoliva.pdfIn PDF document text
    • http://coumert.com/images/file/49333128612.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/tasujegalulepemuvewidipi.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021092419141223.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/46684553249.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614c5c064ce53---90319792858.pdfIn PDF document text
    • https://33mobility.net/uploads/files/jigivomematix.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/74444987117.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614b26262c8ed---lamurem.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/66395398543.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=8+ball+pool+rewards+apkPDF 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_off0000b171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB171 10520 bytes
SHA-256: f59c3df5a4f07a9bf3bf69ff580e43349cb378d251c02b41a3c60cf5e34a4738
font_01_sfnt_off0000c95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95A 16544 bytes
SHA-256: cd35486c497fc35e4eda95b53e1eefbef3b8ed7fb573fd3539f4235d56eccf88
font_02_sfnt_off0000f308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF308 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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