Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a398e0e52fed17a…

MALICIOUS

PDF

74.6 KB Created: 2021-07-05 00:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 28c0ea41b4b2a62fa5a219c2f0dec5cb SHA-1: 5aeff6048a4f505867707b1ca9a03202231e8003 SHA-256: 3a398e0e52fed17a8b259c27f8e057fc22137ad43ca92eaef07fd3ed1335f66c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The document's structure and embedded URLs align with a tactic of using compromised infrastructure to host or link to malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • 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://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/74efcb63b0e6980550ec5146349d6a1b/jegujazotujedugevuragawom.pdf In PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/7bd25e8f34c5e99c37f297cee80d5ff9/43812553352.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a713664cd---89733113562.pdfIn PDF document text
    • https://marosme.ro/hirek/file/52960340087.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/31829404288.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de6321243c---80764252911.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160964efd472ad---waxelugofodub.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/baludofaxabiwajapetesak.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/mupege.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3ee8c209a---65392149282.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/6d5a7b42489d6c70d244c53fa821dc27/99899764940.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/budozof.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bc04c734a0c---zukutupodovakalujatise.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/k8vu8g4j3qs8ti6o5t0jhbj7r6/65368982644.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a6ef34d73---mebexifemex.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/76255596022.pdfIn PDF document text
    • http://chikatere.com/Upload/files/22858958510.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/32967683729.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/26238570120.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/42234381643.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/18486671131.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aac74cbdab---7442041049.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/jizilenusutawosaxurakix.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160755575b1fdb---xavafamururezolun.pdfIn PDF document text
    • http://aimic.com/userfiles/file/87092034772.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=ny+state+electric+and+gasPDF 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_off0000c21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC21C 16660 bytes
SHA-256: a3654e3f13334f07796bff4d59d023e4090da578fb07b4ae57e135454658d55b
font_01_sfnt_off0000ecf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF5 10516 bytes
SHA-256: a53fe64cf7aa2c9121e8042fbba8511985fd31dcfcee555c7731f7a123da694c
font_02_sfnt_off000104cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1