Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a66c2b4a72b6592…

MALICIOUS

PDF

91.0 KB Created: 2021-06-30 09:17:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: da9a247c5c42b7d1f1c138755c441554 SHA-1: 5cdb6969498b43009a3e1524ae78166d91785b98 SHA-256: 1a66c2b4a72b659296fcced8bd2fde84b63df056a4a71a46a5e56ce16dd7b967
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. Heuristics indicate the PDF acts as a link farm, pointing to multiple compromised websites and potentially disposable hosting, suggesting a phishing or SEO-based attack. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://interwork.sk/userfiles/file/xavelar.pdf In PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4426be33e6b2a31a492470dfba0835a1/gigejekupexibafebi.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/25586893357.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/m79e4f7p6n74v3c2umocl2s026/48439110369.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9a578c7bf---fitamiganisukodoke.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/bokosalubutavarares.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/gevugud.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/janeraximufagoliw.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/s3cjmfr6r94estmcv3oj0tcasf/jajazazilofopebomajimopi.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/21950292317.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/jtcsr4v1on4dovll68litfr7aa/wegadaporebivapeb.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/63353077782.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf207391f4---watulalosopilimawixogare.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/74851491306.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/6cd96edb6dbf558c2f354a59509341ec/19282999437.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/4ed6b639d52e37a6e074fc8b72a1766c/suzop.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/iisj6g8qaa21qkfppcg0rd82r3/79149201498.pdfIn PDF document text
    • http://cycling-software.com/files/file/xogevirokerujike.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/27659463194.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2007fe4938---peratemutopanudim.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0114928ed8---37498218389.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/5gksk18pk2u23fj5kb2ihmpbr4/wesafosijisejazitaf.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609844f0072db---nemusesunijowata.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=fire+safety+awareness+monthPDF 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_off000100ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CA 10612 bytes
SHA-256: 1ba1acc59f36b6f4691f136ea50c1005bc349fa0653618df13cfbe21e7a47846
font_01_sfnt_off000118f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F1 17940 bytes
SHA-256: 91a8c1f52ef4e0f7566760fe52178e349d7b540da68730a7d345ad8e02a7f467
font_02_sfnt_off000146e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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