Malicious PDF — malware analysis report

Static analysis result for SHA-256 c68390a1473ac7c9…

MALICIOUS

PDF

80.2 KB Created: 2021-09-04 08:50:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c00bc47913bdf96cdc2594d77f4446a1 SHA-1: 737c3224137382d36f48d0588cd21ea89d0f377d SHA-256: c68390a1473ac7c9828313ef6b9e07598d3a546b250091681ad46002a32c4572
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm containing numerous URLs pointing to compromised WordPress uploads and disposable domains. The primary purpose appears to be directing users to potentially malicious content, consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://villatoscana-pi.it/userfiles/file/lakaminazixawuto.pdf In PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608751483bdf8---verisifolovafemujubevij.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b010adb7a8e---musexa.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/e9fd9c4fc339260c8b34ef79edd64e3d/zotibiburudalifo.pdfIn PDF document text
    • http://growourworld.com/clients/83159/File/remetosaxe.pdfIn PDF document text
    • http://e-sportis.com/images/upload/kerinude.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/ed304faab0580b47cbc82fb59a788b7d/donatanilaxipulewetupe.pdfIn PDF document text
    • http://skyline1968.com/clients/74864/File/40856689925.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/zelerisotoworiviwolin.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/jmri1v029ab87c9eadsftg6rm6/mavut.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/26382878827.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/fofixowumox.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132dd735a2dc---43602225070.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/puvulinabaju.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/n2mo21on2fcfrk2vnvo5fo759c/7540218886.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/a14a5df219dd7480e7510155ef255f77/36221801946.pdfIn PDF document text
    • http://hnatiukreunion.com/clients/b/b5/b5561851e3069b632e798ef7a1275556/File/limelizawituwofiximaj.pdfIn PDF document text
    • http://banquat.com/userfiles/files/popir.pdfIn PDF document text
    • http://richiefamilyreunion.com/clients/7/7d/7d03816b951c94fc7c065ced7c7ccdcd/File/minosunoxafusavobijebefex.pdfIn PDF document text
    • https://biocoils.com/img/file/35867757484.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824f39c4ec1---rixevalajuvanab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=ayurveda+panchakarma+treatment+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD666 10812 bytes
SHA-256: cce4e4d78a0dfa94d91b5a394990e17c5dad7e509948531aaa57a5c1dec9a3cc
font_01_sfnt_off0000ef34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF34 17052 bytes
SHA-256: 55332c9d4b9885e96ed6f1178fb7c51a84131286f873ac22ebe03c7a5b99c776
font_02_sfnt_off00011b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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