Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4321609c85d5660…

MALICIOUS

PDF

80.0 KB Created: 2021-09-01 04:17:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c6501bad58810182c4b651fd7fcc76d1 SHA-1: c73ff3220dac2ce571862292bf5301bd3d20d875 SHA-256: c4321609c85d5660ef5b741390bed1360bf7abc96f4aa2602eed8ef225076859
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that exhibits characteristics of a phishing lure, specifically requesting sensitive recovery or private key information. Multiple heuristics indicate the document is part of a link farm hosted on compromised or disposable domains, suggesting an attempt to direct users to malicious sites. While no scripts were explicitly extracted, the presence of external URIs and the nature of the requested information strongly suggest a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://crysiq.ru/uplcv?utm_term=295+usd+to+nis PDF link annotation
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/ujhsb0i3auie8ejock41e0c0tm/78887186967.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/biwesasagopivaradujir.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16089b4de36cc0---xixatiz.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/68488479664.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3eab539823---foxetaduw.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/e71e2ab7bc1bae18c6cfc3f96373d82f/dananem.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/24dd57d63dd41566fe3f664a4b423efd/gozaga.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/dudefumubaturifixe.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c215740f5de---39991574429.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/36e4fec91fb33a24a0380b7e1e8ffff3/gilidabamoz.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/13728544191.pdfIn PDF document text
    • http://hopsch.de/uploads/file/3576489009.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/ridigaxiwojewasesa.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16081a79671c7a---gesuzofexezolufodi.pdfIn PDF document text
    • https://artbynela.com/uploads/file/watezulop.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/83690408012.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/12354124182.pdfIn PDF document text
    • https://alyansdugunsalonu.com/userfiles/files/ragobixu.pdfIn PDF document text
    • http://onellenorzes.com/uploads/files/xofewepub.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/gurolefavebanexumokota.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072c7dd4b9b8---33723013755.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/66969688998.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9cb989e86---81731627291.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/76814c628777b279176821ffa0cfc390/kofumefiwakawapon.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/96ba560c6fe33e3f55056f2e52cad031/bufinimoliminiwasuwugijat.pdfIn PDF document text
    • 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_off0000ccb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB9 20820 bytes
SHA-256: 95b8a083c4edcbe19df850acf6b02a5c89fb766411718d066c5cd137c341d619
font_01_sfnt_off0001027d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A94 10228 bytes
SHA-256: 9e31c013a1fb1a2008301a23c67982f223d36ca89e5768748dcb364031ee8b0e

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