Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3ca0a6e62e1dd43…

MALICIOUS

PDF

78.0 KB Created: 2021-06-30 10:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 230e134b1758aa68de74c8d848025d93 SHA-1: 37bf030ef5d7b089f42b972899970eccdbc349c0 SHA-256: a3ca0a6e62e1dd436d13eec1ce1d290b8f3dc3b6e6881d4c4fe16081d329e832
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The file contains a link farm pointing to numerous compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farms indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://medvor.ru/uplcv?utm_term=convert+word+file+into+pdf+free+online PDF link annotation
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/85214169700.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd7c6a3db5---64141955625.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/55bfc4f531ef4e2652fe7886a5de28de/41881637054.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/9119360c4c774f5f75daa723046e0590/36470843223.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/jezedezopak.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c250ab94e1d---kutepum.pdfIn PDF document text
    • http://skincarebylaura.com/clients/862251/File/70014445762.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/72237147916.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/211995882660d1faf6536b8.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/48692051042.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef33579615---88935255246.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/abae1b097c4990aff83927aa51fca655/70435805349.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089bdfab100c---9579344495.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/44d94bdd7329a32f6384226ef78af695/11422354747.pdfIn PDF document text
    • http://centronegozi.com/public/64415911971.pdfIn PDF document text
    • http://caf-ljubljana.si/docs/15264519248.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/levevinulupefabotozex.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/30101313536.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/dolodajowapuxoxo.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608e05fcbec1d---mubujefarenekutenas.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/2979292256.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/697a4577eb07a6e64ea3d042c2d7d1be/55706131464.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/d3f5966fb6b5ab8adb57424d96374f84/widosawulat.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/nhg9htesatudtr32erak04jlk8/37998795861.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160a989eb206cc---bupopadutesotijofaba.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_off0000cfe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE4 16616 bytes
SHA-256: d37fcc954631a84fdecabe419382e791723df151acdff1f1dd79744485f5f8c1
font_01_sfnt_off0000fada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F1 10344 bytes
SHA-256: 076ec3616f63fa82de43613b5ee03d764c128ca0a24c5fdc6be913552612a6f2

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