Malicious PDF — malware analysis report

Static analysis result for SHA-256 50772fda39b883e4…

MALICIOUS

PDF

86.1 KB Created: 2021-09-02 17:15:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ba3acded6d75794d51e235828adb69a8 SHA-1: af74c545405fd2f5c3208910f7b8c104a3b5adff SHA-256: 50772fda39b883e4fb816a19676a3f3f65be4033f6f024646d6484c7a90111fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised CMS upload directories and disposable hosting domains. The presence of these links suggests an attempt to direct users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://aradovan.com/userfiles/file/lanofi.pdf In PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f52501cc85---75000940459.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805f3c32619---97557968089.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/21267019273.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/53698267423.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210718221211.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/88330f2b45f79866bd0bd5e21d9ee139/munipe.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bfb4f0e4f3f---62086153778.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/ferumirivejusanazepaji.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/muzabijuruwoga.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/dalaniwilodebogijotuzaze.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/lojexuloza.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/5j5pp489dt308amu2kte38jjkb/tatusamefulinil.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/texezigotamizutum.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9a364d078---83073681436.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210612045329.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/26027550e51587e40d0d0f9e1ef43e1e/85495010613.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70571083324.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/roruxipumorobowawesomu.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/berexozewetazuro.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/nedorigekuvajujofulo.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/810001c569b400bc760af62d0a09186e/videduzokevatarukotomebij.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/19717819341.pdfIn PDF document text
    • https://duongthuy.net/userfiles/file/76892158795.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/33410838454.pdfIn PDF document text
    • http://pitneyclan.com/clients/c/c7/c7afcfad87c307b096642b2e35f52d25/File/fatikobinefategono.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=balanceamento+quimico+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE682 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE94 19808 bytes
SHA-256: 0acee07d35af71f8c2ca728300319e837f96fca26f7ac6b60d2e13532959270e
font_02_sfnt_off00013207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13207 10812 bytes
SHA-256: 1c25f9a1141c45260022a541733e2e817dacfd05fba60f22b11c0ba70dd2f9a1

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