Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9c2e5f42267b557…

MALICIOUS

PDF

124.5 KB Created: 2021-09-03 10:33:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a780994ec436a0dbb510172ce1f21646 SHA-1: 71e723a18fb82b19177ba9b05a5fd9f0e6ea97ae SHA-256: c9c2e5f42267b557f089510f607d1b11c6f108b90b8598616f92ec5dc1b78948
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that likely lead to phishing sites or further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting an attempt to evade detection. While no scripts were explicitly extracted, the nature of link farms in PDFs often involves JavaScript to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://queure.ru/uplcv?utm_term=programacion+lineal+ejercicios+resueltos+paso+a+paso+pdf PDF link annotation
    • https://cardion.dk/gfx/fckimages/file/60215576548.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8c0e1124df33ad7dd8d83653abc74e1e/pubomuriwebad.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/28025320600.pdfIn PDF document text
    • http://jordanfamilyreunions.com/clients/5/51/51534e3e38036466a76ca8a024fd4923/File/funobopogupulozi.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/c9da5ae084900f875af6606a08ca6126/74974497350.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a49fe9d308f---97227130105.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/fa2205d0b5176e255db8c832dba72e08/wamizalatelejazagabusune.pdfIn PDF document text
    • https://tekartltd.com/upload/files/roxotasujixuvapimizabusus.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210821001440_2c77b1.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/84472169345.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/68182025576.pdfIn PDF document text
    • https://flyags.com/editorResources/file///19673474046.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/36775385963.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16084159a4b3d6---xegubiteninevuwutuvudutu.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/mr6ei11g3jv3bdes02u0274k51/57059788281.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8b358086e---44117320338.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/sesufusagakonaxagaloga.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/68545050945.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/31556611386.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/lupemuruna.pdfIn PDF document text
    • https://auto826.com/uploads/files/19274006662.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

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_off000177f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177F3 11196 bytes
SHA-256: 1ed84f5ea002e9b6b713b822424cba1c422f15b375690fe87bc9eb7da3ab4851
font_01_sfnt_off000191ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191EC 21584 bytes
SHA-256: 3352349822c80ba27ab432fdfbe9b0e3cf6509e9f12d2c9df15d8a36963c49e5
font_02_sfnt_off0001c9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C9C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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