Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf1a18e9fc0653a0…

MALICIOUS

PDF

85.6 KB Created: 2021-06-28 10:36:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6bdb34e6e231437d872ec70120fd237c SHA-1: 306e557e7ea87fe18d6b92c943212a7fbdd775ba SHA-256: cf1a18e9fc0653a08ade6a92e682469670aa564c162ae6aa7ce7831307874479
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to compromised WordPress sites, likely intended to redirect users to malicious content or phishing pages. The presence of numerous external URIs and the compromised CMS upload links strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://medvor.ru/uplcv?utm_term=what+to+feed+minecraft+cows PDF link annotation
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/dnk5k3qchje8p8q4fnrs470pm5/dabevexorisis.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/15307796637.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/10803713750.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/41088547508.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/kln18m69ge7ji9k04iah6jibuh/sezanezufipomituwat.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/7369732040.pdfIn PDF document text
    • https://inncredel.com/uploads/97686572992.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/a9af40a176933f2a2ba510e7725610cc/23008720069.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/4fcbc142c828147acaf7f386074b7a64/51481168928.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/43cac1e08752f98c653ca56525e64133/30349641186.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/73415655528.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16084939c44092---dodavugezediwin.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/2761020860.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb34018ff5---98167540772.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/ece79e13174031d2b3b9ff58b86230b6/zijudegikititagorur.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/38724809665.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/9c0ced9cc010246ec44a979fc228f475/sotenuveluvurutek.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be225478417---45837632630.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/99545383533.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/757tj556ulv1gqgl8ljngfll01/wudevidevito.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb97ca5384---mazud.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f840766cb6---42346953277.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_off0000ec19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001042b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042B 16988 bytes
SHA-256: 219eeb73768dde26c49876247f58bd5c63a8840df06f522907e6acd5bd330bc4
font_02_sfnt_off00013093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13093 10772 bytes
SHA-256: 2d3c2121ec32784cb9908c3fe83aa2dc3cdbe981f281636a2dac9a2383dbf9fc

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