Malicious PDF — malware analysis report

Static analysis result for SHA-256 25371dc2ef3feab4…

MALICIOUS

PDF

72.2 KB Created: 2021-08-16 22:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 20c9b308c2c9970dae8ccba5a38b855c SHA-1: adc1add19c6fc7d6ebc0e4174efc6438581a67e9 SHA-256: 25371dc2ef3feab4315fbe06e4f8c70cbce62ac80c2130fae1482a800da27543
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985f1ad0d00---matopedavobokedami.pdf In PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a14419a21---waxedesujosot.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/xizir.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/veniniduro.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e7bf0e37208---zozekovelofuret.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/wimuwevujubi.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a89f976127---ruzode.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/147200442.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/jjsjv4fk5063g32g1856bh0vqb/rodixanilufidarujogox.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/sujogoted.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/eocc36bfk7k4vtj7t7ln8kglsm/babubabitujijumabusapepep.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c0900ba5d6d---rokezeluzotixu.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/40082653984.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609859ae51395---wabufakutabizakigiz.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/15aa16740808d922f1c1c72828d146e5/45097449207.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/c087e648ee707bfa4d47d3b1288a9e02/rurelefemikasobaxebumerus.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/54953864754.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/sugipagebemev.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/62253345324.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/97769477271.pdfIn PDF document text
    • https://yorapp.it/file/49940756979.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/8253558892.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=jnc+8+guidelines+for+hypertensionPDF 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_off0000b9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9DB 11152 bytes
SHA-256: 9a38f2ebd58aef644a726f21c2b69dd51207d0932b61c4a8457f1d69161b6df3
font_01_sfnt_off0000d3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BD 15392 bytes
SHA-256: 338d77956494c7353ab2297fab89915aae068f47d7f14f7b52062e7ee7fe6c96
font_02_sfnt_off0000fb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1