Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f47237dca6c3a5a…

MALICIOUS

PDF

82.0 KB Created: 2021-09-07 14:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 173a26a50023938b982fd9992860f1e2 SHA-1: c82b1f3ddb83afc0348ce5a475c1cbdc6d04d643 SHA-256: 2f47237dca6c3a5a0ba06038386bd5f20e5c009c94680d7ee0b167bc6311d9a7
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to various compromised or disposable hosting sites, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior suggest an attempt to redirect users to malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://phuwangnam.com/user_file/file/kojuvawumibo.pdf In PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/ba616a701d06a54e480f3efb4483c2ea/lejefum.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/regudutefiwu.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/77690208141.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0d375c247---betufo.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/xeminixizizenu.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/66756936921.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5fb79c7db---78618327347.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7271b685ff---90723524232.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/xegojukamisumoruzudovali.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/66c5c3a8c8f48ffa61d113728b7e2b2d/daxurobekopupemegaj.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/5bdd2a39cfd6fce23d1a6103aeacb03b/43773369434.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/19760379053.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/a3feed48e83bf4f13f5966f16dbc2ab0/pasadesobemabuvuzemabad.pdfIn PDF document text
    • http://aptatravel.com/clients/4/48/489dad2d2d8436d4c085fc0ccdc2d1b3/File/68096863250.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/81795485479.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083dd621f959---xugimeto.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/94671649109.pdfIn PDF document text
    • http://www.siposferenc.hu/html/kedixojuwoworuvavobamak.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1214cc338---sofidipokorovokes.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/59186794336.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/48246477817.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=professor+messer+n10-007+course+notes+pdfPDF 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_off0000d83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF051 18568 bytes
SHA-256: 10cc38fdc9e9415ff33a2de9cdf715f4275e4f597c123be01e6a5ad67a795750
font_02_sfnt_off0001206a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206A 10840 bytes
SHA-256: 6c742dec929165108b09222f6e632d82d655be917ae8b46693262b5205e429ff

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