Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc59932c01d8dc73…

MALICIOUS

PDF

81.6 KB Created: 2021-09-11 19:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 53814f4c0730b2c2256b96f8b9084ac1 SHA-1: 0348bebab83222d82b8c7a6f9f902fa6ca45c3a6 SHA-256: dc59932c01d8dc73eed875076bd149b764a31b08eb262815c5f9afcd67103640
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to potentially compromised WordPress sites and disposable hosting domains, which in turn host further PDF files. The presence of multiple external URIs and a link farm structure suggests an attempt to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://itps-group.com/uploadfiles/file/66183711001.pdf In PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/vamaxepib.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/70105781005.pdfIn PDF document text
    • https://xn--dokumaanahtarlk-llc.net/userfiles/file/25491995969.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/vetamimovolarilax.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/77343720834.pdfIn PDF document text
    • http://sinoorchids.com/image/file/55003924874.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/17107988918.pdfIn PDF document text
    • http://thewesternmist.com/userfiles/file/37345148633.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161355b7e55352---9227996017.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/cictc8p30k3q1eacou0qvaoij6/13436135078.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/74056243856.pdfIn PDF document text
    • https://wasael.com/userfiles/file/bijurejelo.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/boxolofewotonifijos.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/terezominebugewosebu.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/xetefaditevisufasumozexi.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/betajem.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c21fa212f---vujomaririvaxon.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/luxofapavuge.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/dajanefamisosome.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/juxibeni.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613672c5cd295---powarobepokex.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/54143775768.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=descargar+igo+androidPDF 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_off0000d84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF063 10400 bytes
SHA-256: d046979f7e83d1192581051180e99901cda62c073a2829af0468cd12792750ea
font_02_sfnt_off000107d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D0 19080 bytes
SHA-256: 63202c6af6759d87f251740896af8fda158cf105d10530c668b15134b73a099e

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