Malicious PDF — malware analysis report

Static analysis result for SHA-256 a04137223ad000df…

MALICIOUS

PDF

82.2 KB Created: 2021-09-18 06:29:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 83d07197ed817ecc48231b3bcca0b6e9 SHA-1: a691aa1be0e7ff254b76cb8ea8310ecd50e10471 SHA-256: a04137223ad000df07752cf1d8b9cbaccae5921f8378dfb2b8003d79e58e9622
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/vit0c5hc3dab12vjstord5mko4/89524552969.pdf In PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/4794686224.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/nebefukel.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/72566833524.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/rimifikekagefu.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/87864542062.pdfIn PDF document text
    • https://ntc-container.com/upload/files/85636733409.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/nuxapamukewodavi.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/57666210326.pdfIn PDF document text
    • http://harrodsrentacar.com/public_html/userfiles/file/29766833618.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/mujidefas.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/fegeg.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/kavob.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/73919895944.pdfIn PDF document text
    • http://domplus.su/userfiles/files/sitejemosobovubikizod.pdfIn PDF document text
    • http://haihengpharm.com/upload/files/guwabipalifuvaxus.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161351a2da1f62---16719265787.pdfIn PDF document text
    • http://www.heksan.com.pl/file/51170467231.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/16536021260.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/6738826826.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/daa9ca824964426fa44f00147c4a2ee7/49521601816.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/13343577197.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/wabaxewonumimifudupivux.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/92814590587.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=cartoon+photo+editor+cartoon+yourself+selfie+art+mod+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_off0000d5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BC 20172 bytes
SHA-256: fd6bde30859e77fef5e52c9be5b8cc5e69171ed3d4d8f712f55eefa9715659f7
font_01_sfnt_off00010921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10921 11220 bytes
SHA-256: dc420af115bf339ac6341c9e4e2965ff58b1b036fd3adae0c7244858e204443d
font_02_sfnt_off00012343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12343 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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