Malicious PDF — malware analysis report

Static analysis result for SHA-256 40f0d90ad9eb4383…

MALICIOUS

PDF

112.4 KB Created: 2021-07-02 05:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 41c224075aad302c3cd2448f6d87e1d9 SHA-1: b8af05dfa511ac60059b535084a5675b887f94ef SHA-256: 40f0d90ad9eb438395f94edf429608e2dd84f47ed9c5e373736ff74df048b007
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate the PDF acts as a link farm, directing users to multiple compromised or disposable hosting sites, which is a common tactic for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://d4storonto.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/87908976639.pdf In PDF document text
    • https://scalper.ir/data/files/file/59966007980.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/kamipesujijatopib.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/19872496823.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/74093677029.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e4c75b872---39708544832.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/muwarifiz.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/umcj5f01a8n705454o2ghbvb71/49434049665.pdfIn PDF document text
    • http://cabin4kids.org/clients/0/05/050cd0fff5f75fdfd14851583cc0de74/File/lozuzotiwuzedidagum.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609742562affd---49422445467.pdfIn PDF document text
    • http://matthewsmillsreunion.com/clients/c/c7/c7863f7b93cb17915b2a89d887155530/File/defejawobo.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/88464108438.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/77760918551.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/bodujepil.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/ml6glfhkmh4vo3rp7abtshh192/55661203874.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be0f4a9c3c5---xijiledibupogajaku.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/22374583928.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/24318522957.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a880c83e1---4124667018.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160afb3d196dea---deram.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/kajerarugosabetebolekimoz.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a404cb276a4---23683132023.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/zuzemajabutato.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/16523092763.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=comma+after+list+of+threePDF 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_off00015535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15535 17940 bytes
SHA-256: 93287762542760675d2f8672386ae7ddaa09f413b1c90bab7ae65fcbc996d0ef
font_01_sfnt_off00018477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18477 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019c8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C8E 10408 bytes
SHA-256: 685c950f4593edfd25f6760edeb1c1fae5fa23ca507933b457943e195517caab

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