Malicious PDF — malware analysis report

Static analysis result for SHA-256 a59b478f40003ec5…

MALICIOUS

PDF

68.6 KB Created: 2021-10-04 00:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b092e1f8656446327c03d73c646f68f5 SHA-1: 3bec80bb233d77699b8bc9bd9e282d4f830da89b SHA-256: a59b478f40003ec549318f3bdd4637d24c9a564c1aeb54368f817dc2d1c9b4af
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan. The heuristics indicate it contains a link farm pointing to compromised CMS uploads and disposable hosting, and it acts as a callback lure, prompting users to call a phone number. Although no scripts were extracted, the overall structure and heuristic firings strongly suggest a phishing attempt designed to trick users into engaging with a malicious actor.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://pernambucoimortal.com/imagens/files/kixakifezanaxeba.pdf In PDF document text
    • http://demo-jesma.shopcloud.es/ckfinder/userfiles/files/1963157514.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/32355611324.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/jitego.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/47182974358.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139306976aa6---binosofe.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/dizupofixuxol.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c60359d5bb---rinuzokate.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/boberojetam.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/selenapusafofewiti.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/30436418664.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/79eb2110dc5166a4cda688ed9aa999f0/71925131852.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/35600563711.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/32814852816.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/31618550184.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/25850883417.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/zogokoxurazejumo.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/degetipidigage.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/98521263947.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/74149604180.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/040239272049.pdfIn PDF document text
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/77825387296.pdfIn PDF document text
    • http://mathahospital.org/userfiles/file/lexusofizizisojagimujoket.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=water+cycle+drawing+photoPDF 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_off0000adda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F1 10820 bytes
SHA-256: 1e06812db1a2dc0a0254a14388c4f53329886f2e58a05836c8957fe9c9b7a1e5
font_02_sfnt_off0000dea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA1 14688 bytes
SHA-256: 9d3167512be24951f32e9dd545ecfafb5a790b00a4bf859cc5125a005f24ece1

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