Malicious PDF — malware analysis report

Static analysis result for SHA-256 f65d23cff5972430…

MALICIOUS

PDF

84.0 KB Created: 2021-09-08 00:28:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d27d48540e38b1a7b054580686b4c354 SHA-1: d4f87837ddb7990011f86da9b198d5da9e5afe51 SHA-256: f65d23cff5972430f04e068463c73c0aacfd793b0e0d76e3d779eb5faa665964
196 Risk Score

Malware Insights

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

This PDF document is flagged as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. The presence of a 'Remote-support tool lure' heuristic suggests the document aims to trick the user into installing or connecting with remote access software. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or social engineering attack, likely designed to facilitate unauthorized access or financial fraud.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://fulepmark.hu/nyebu/fulepmark/userfiles/file/sopujigopedezu.pdf In PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/b81b85af517677e603f7785221f5e304/29040190811.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/32417178765.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/bizafugetad.pdfIn PDF document text
    • http://keigan-productions.com/clients/863431/File/memub.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e90b302f99---30469261748.pdfIn PDF document text
    • https://marmetal.cevhertemizlik.com/userfiles/files/89370215795.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210728111510.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/vatililineseme.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/29927382382.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/lenanubadowisiv.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/vopuviwi.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/2d19c369c45a6b414c2e1f7a0ef6e774/lapejesarok.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/s75s8j5n6qrto85hurl5u73q5d/41048401407.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092eb624cf7b---senizesobometefezowoles.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608423020ec42---mabure.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/nejurebamojijirorelasux.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc5033b246---2400269454.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/xugujogowodebir.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/44528007821.pdfIn PDF document text
    • http://getvisa.ru/images/File/davenokagefozivej.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/kemevasatipadatabuku.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074ca722cfca---jivoresinaleguzolujevi.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/46552286948.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/89547924540.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=practical+skills+in+chemistry+john+dean+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_off0000e229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE229 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA40 11220 bytes
SHA-256: b23ae2ca43344e55afab9819a0a58e6c3962b11ec3d943464be2b97bf7d67c93
font_02_sfnt_off0001144b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144B 17552 bytes
SHA-256: 90699fb3447459d9b6c76b4ad2e85f5a6ad3983064754c433f6b628c0c0eb91f

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