Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d4fd8e448991dbf…

MALICIOUS

PDF

94.1 KB Created: 2021-09-05 08:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b476835af87f0461ea0a88b419fc2708 SHA-1: 6f51f18dac4f5f661b5adf358e4ce827b3d9f563 SHA-256: 5d4fd8e448991dbff9a45b27681b49858fe88ccae2484b35d9e83bce4cab112a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics point to the document being a link farm, with many URLs hosted on compromised CMS uploads or disposable domains. The presence of embedded URLs suggests an attempt to redirect the user to malicious sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://alexandraharris.com/clients/36054/File/90436095105.pdf In PDF document text
    • http://fairway.cc/images/blog/file/jofavisefobomavipu.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/48673686712.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607050d185657---wilijijivufifurosane.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a819b5a95dd---tajalixudijesifitosiw.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/323n7ru6dqn90pq0plo1be0cdt/40215571574.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9f9538056---rugaloz.pdfIn PDF document text
    • http://miele-service-center.ru/uploads/files/kofevulifofozonunimul.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/18105299733.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/fozowenuduvonobirunaso.pdfIn PDF document text
    • http://starlightcelebrates.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/penagufu.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/26c7060358714df54aa87118810c1b88/xananabemadetivilumaza.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/36vosphotq8ai13eqhdeekhkg1/rixega.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c39d05a67ce---rosezawagosol.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/54c767ae33dc28b601b93770694e562f/5725858071.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/36536976709.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d55ba1270---vevodefikibuzujeduvatajiz.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e574ee1022---jevenofejoxeda.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/c72693587d1944d0c9061a34944c3da1/pojumarimimumituk.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160d7d53e1ff9b---rakewuzofumaremabam.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f8f961772---13158945689.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16089e794d433f---luvagipubugerazu.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/0bbf0828f6685f26144726afdc8c6cd2/42381220637.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/mebogigadorozejufutujo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=julius+caesar+full+book+pdf+downloadPDF 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_off00010330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10330 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B47 10924 bytes
SHA-256: f38726dbbad3fd697ed9e25d2ceca1f192015847f410210703de3b73fdf2fcbe
font_02_sfnt_off00013485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13485 20352 bytes
SHA-256: 2d2abbabc196fde1366aac4e30bd6b3ced27f09737e80aee6b0a61f913a53679

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