Malicious PDF — malware analysis report

Static analysis result for SHA-256 559d5208f4adab62…

MALICIOUS

PDF

80.4 KB Created: 2021-09-05 21:33:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f207ea5f462a91975607ea3956942cf9 SHA-1: 957195511c9ce1f1702f53c12b30a267942f616d SHA-256: 559d5208f4adab628880f4cee7a46c7d8245254873a6ae113082454717ec2f71
126 Risk Score

Malware Insights

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

The file is a PDF document identified by ClamAV as a phishing trojan. It contains numerous URLs, many of which point to compromised websites or are structured as link farms, suggesting an attempt to redirect users to malicious content. The PDF's structure and the presence of multiple external links indicate a likely phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4379

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://to-tuong.com/media/ckfinder/files/16224439771.pdf In PDF document text
    • https://marblobath.com/app/webroot/img/files/nedin.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210630_3B77936D22B907B2.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210725135928.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/52491107455.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/5bd9d8ffffc6d17dba036a70f30616d2/guronolepugiranasagero.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d143699fcd---6480674458.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160860d9357622---85612330042.pdfIn PDF document text
    • https://laps.pl/userfiles/file/xifuxos.pdfIn PDF document text
    • http://njxinbell.com/upload/files/69179263697.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608adbe38162c---soditazetajijusitos.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/bipibamokumirelijawugef.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/9d05b79d10f641e8a273c7d359ccc4c7/dugibumovaselelixuxipun.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e25f3d598---mozuvumilidaleg.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/luzejoxepematolelesurina.pdfIn PDF document text
    • http://allycatering.com/userfiles/10575003557.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/df121894cf76f3011210191c51ed8d91/5429507992.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608585b5d28a3---72852093296.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16072d687543b3---fodaginobojusawobisokem.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcf817f53a---xugegoza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=bulgakov+kutyasz%C3%ADv+pdfPDF link annotation
    • 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_off0000d7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B3 10792 bytes
SHA-256: 74e02c15ca6774f570820b2a48ed08f240a03e1a9ecf2fefaad1009a0faf6f03
font_01_sfnt_off0000f0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B5 20600 bytes
SHA-256: 6e975739b98eaf81f9b62e6cc354ea1dd09df81c20d63c00b373bce2e0d3efa9