Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8dda4c46ecaa2bd…

MALICIOUS

PDF

83.9 KB Created: 2021-07-23 11:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 16ade6d9573be35dfcdb3ca6a5d1e6e1 SHA-1: f36b1fe67734b117f48c1aacfe9bc4ca9b759b5c SHA-256: a8dda4c46ecaa2bd8b3cc6a467cc4b8d9bc62d36a45ff7042fc4c97c1ef7a2f0
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://landpas.pl/upload/file/dekuvo.pdf In PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/72b4d2b463d78d986b6048493ba85b33/65237112854.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/btrses3se39iar96k02jtkjj13/24895558604.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609aabc6b92b0---3980169985.pdfIn PDF document text
    • http://clinicoral.com/img/userfiles/files/fodofakadikilikonezuwuw.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/ed0cc81335f4eba48070b5e68cf871c1/15283573528.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe0c845259---18134773316.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/38691408681.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a606917cdd7---vepuberewufijajomixel.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/27042116179.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/bezaladogupuvop.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6fde1b40c---58532759922.pdfIn PDF document text
    • http://innotack.com/userfiles/files/wimowewam.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/67057542687.pdfIn PDF document text
    • https://cahayaapi1.com/contents//files/jepufodal.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/xiwale.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd0449abd50---nevuvizaguvovilulimararov.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021052215080942.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/lukurerorepikimamore.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/wexofamexisilabuselasewol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=first+quarter+moon+drawingPDF link annotation
    • https://lapdonline.org/file/63516585989.pdfIn PDF document text
    • 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_off0000e720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE720 10852 bytes
SHA-256: 52d371d012062412f15d0f65d645830bc9c7df9d8b2ca6750e631843436a4aef
font_01_sfnt_off0000ffb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB4 16436 bytes
SHA-256: ea31817ec686c6e6bc92fc9e5a7b2c6f5b67bdcb83bc8a16c42a2e000ce1bd5e
font_02_sfnt_off00012a09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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