Malicious PDF — malware analysis report

Static analysis result for SHA-256 efe8497b70dc0523…

MALICIOUS

PDF

84.5 KB Created: 2021-09-02 19:25:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 00f3796a4f482c0121e40c60a45ab7a3 SHA-1: 182215afb8474891e3af721111529901317219d2 SHA-256: efe8497b70dc05233684880321753cf9d2477ea1fed72277a3a102d07c8dd5ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. The primary purpose appears to be directing users to potentially malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://maryamghiasi.com/images/upload/files/52217702970.pdf In PDF document text
    • http://mu-rrrc.com/userfiles/file/57239149435.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/ef8e2cc45c725749e1831d41e672b2cb/97885291227.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/95063748419.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5b3c1876a---ladovofebagijakipifufufil.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/zejefanuvazi.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/68917538371.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/93679066488.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/4dovfgrg3dqrkab9nm4eq6pn42/6233103620.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/buteraligitutikonig.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents//files/30755419295.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081ae56ceb5b---8655197809.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/7fe8d7977d13127e366661d81653fa48/10930330528.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/20774fb450a465cab5e557b40ce85882/zuwofipet.pdfIn PDF document text
    • http://anthonyellisonfamilyreunion.com/clients/f/ff/ff850d76676c1858bf5e443b7a907d3b/File/regikuxedadozi.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608290ab7ac96---gikijupida.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2a171690c4---giginosaralagivetibi.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/7aec7af5cb5325ec22154f6be23dcd18/13045166691.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/31328391678.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210623221839792887.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16115bba4cb72a---nejupasusevoporedewoko.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/mj0d72oa8bou065lto6417043c/zexipevo.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606efaf9bfacf---sejonakifabesixibi.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70524663298.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=pdf+summary+maker+onlinePDF 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_off0000e33d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33D 18456 bytes
SHA-256: c81af6897857a2629ff04d9568e4077cf31260569aa7c4a43b8f2af244c7077a
font_01_sfnt_off00011330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11330 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B47 10724 bytes
SHA-256: 244f13bcf89d70ac3bab90f7858686f3173ce1b527e4e92e1d0e1548c13d6204

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