Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b23f28ae712044…

MALICIOUS

PDF

85.9 KB Created: 2021-09-03 04:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 643694aad230392b145fd586b5857b53 SHA-1: 5ff78d96f004d7c527243639b9436384f16daea4 SHA-256: f3b23f28ae7120448595d3b59dc1a0df8e25b201fc6e330f73ae651057acb058
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to other PDFs hosted on compromised websites, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or further malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://aslimitada.com/userfiles/file/23707755366.pdf In PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607f433e52ce8---6611196294.pdfIn PDF document text
    • http://anm-av.de/uploads/files/majizavubidosoda.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/498ecdc0c397904e4e750bd0d553a769/teziwene.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/86017790170.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16092e62acb7f6---gosizutegolutitosusa.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/c9eddc733ed02698a6b04c14386c7a39/99915921970.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/mukofefugari.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/8d551f69c965270e0e3d226beb86c9c9/pesalovezamufefulibus.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908651ba7b3---93784371726.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/nomikm89q24814g3o183au9r6c/75381304992.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/93677269206.pdfIn PDF document text
    • https://senhewood.com/d/files/wasibokoj.pdfIn PDF document text
    • https://motacademy.it/file/49439177781.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/magalaxu.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/11052194769.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609263d81987b---43628517538.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f3bb4ff48---55165085266.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/ef9e31b94dae30b0309891ba2fb906ab/ligatojikolu.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/kikesuxij.pdfIn PDF document text
    • http://umiyawoodworks.com/fckdb/userfiles/file/bewopuvori.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/22850225998.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/c65e27dda80563171ca43322fa881e15/nemefu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=ottobock+3r80+manualPDF 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_off0000e95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95C 10856 bytes
SHA-256: 195c82df883a62d2978db45e7fc8cccffa4ead49993db751e87c0f66743c2690
font_01_sfnt_off00010282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10282 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A94 18412 bytes
SHA-256: 0ba4a21a1c9a446465bc08fc1d37973cc2c6c44a9e500b3bbbfc0978cb48a5a4

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