Malicious PDF — malware analysis report

Static analysis result for SHA-256 32684f53bcde79a3…

MALICIOUS

PDF

95.4 KB Created: 2021-09-01 11:11:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: a11c7d1c7ddef3413e98dd3694410586 SHA-1: c25193b6ceb6df2554b5adc0f971159156d6c28f SHA-256: 32684f53bcde79a39a21642c8db0ee835f192adc1649c48e7f8a5ca50ff2d9ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://sungsam.net/userData/board/file/bubabanexixamaridajurito.pdf In PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/togegefejuxet.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761b3c35cb6---punozasanezo.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/zoribupuxuruso.pdfIn PDF document text
    • https://beautydent.hu/editor_up/sidavakago.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/79961516261.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/muwatowifuxu.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c14d17148---89009739012.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/3392cc38522125864b0f72d2f1dc366e/27290204466.pdfIn PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/lofisexenomezadebafonudu.pdfIn PDF document text
    • http://esangsok.com/upfile/files/29038260778.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/xaputifufilanix.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/809c1ba23e1b35f7ff8694623ddbb258/kojagal.pdfIn PDF document text
    • https://lecachet.fr/docs/files/26549356762.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/bokij.pdfIn PDF document text
    • http://theettiaresottawa.ca/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/zozosanojexenedof.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/9411122013.pdfIn PDF document text
    • https://people11people.gr/uploads/File/29417183902.pdfIn PDF document text
    • http://salt17.com/userfiles/files/povesix.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/68779716924.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210821_CF457E381AC1305E.pdfIn PDF document text
    • http://ozona.pt/wysiwygfiles/file/97186497545.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/17357706023.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/sebepupabimu.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/p3roosdcaqugktqgglc2tn1lc7/sewidaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=sexual+reproduction+in+flowering+plants+neet+notesPDF 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_off00010ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC6 11160 bytes
SHA-256: ab4b2c23985036c0e08442f99e7aa5b8e7373c313c57506c315c686037759ceb
font_01_sfnt_off000128cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128CC 17848 bytes
SHA-256: 7458ebe86380e1c2421fbbcca2db62423b7ddf80e33dc2a5328a11f5d0b50ece
font_02_sfnt_off0001568a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1568A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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