Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c2118426a578a0a…

MALICIOUS

PDF

90.4 KB Created: 2021-06-26 08:05:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7a38e0108f849eccb4900c406188f122 SHA-1: 8f20842bb76ab9ffbc8fca11e4c3267c6277cf99 SHA-256: 3c2118426a578a0aea8f85daebc0f634d587c19ea6d3c43cd5e5852be505220c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting it's designed to redirect users to malicious content. The ML classifier strongly indicates maliciousness, and the link farm nature points towards a phishing or malware distribution attempt. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/9e4b7f04a57db6a2ede81a7845813241/felutogixapovitesajotol.pdf In PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c22a96e87---nofaginegutoponilivabemap.pdfIn PDF document text
    • http://bronia.org/userfiles/file/31436077583.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/c72a137bc4ca910aa40060b379c40217/72754385710.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/kg3563nns8ioacnn7go4739lph/kelemojixivivako.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/86569443732.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/6j7l2lm4tohcmool38oqiacuu3/80859652062.pdfIn PDF document text
    • http://novichiha.ru/pic/file/kefiz.pdfIn PDF document text
    • https://bczenekar.hu/files/file/kiroregojoboxi.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/db53cf9e54de14f2ba4c64d2ebda3592/wewefekifameluravoxe.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/4a3191a636f8b3bc931341db1f8ca4ac/41585817346.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2c2118273---rimuxavesilerivakajij.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/99109455256.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cafa1558bb4---72105946342.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/ee70169e1c9d19ad9c7c1f3016e50abb/metiguzifozu.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/zekolobowowusokupanixaxo.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/c97450319ac33926bd5eb6ebe16f5e3a/25729320712.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/92585442448.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160d403a3adcae---sewobisojapiwaworulokon.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/eabb7162d625a994fe86b078b3474afc/16812794581.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/jivowedoreni.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/bg8on4vrm4ajhtnspkl1nds6q2/fawinesekiw.pdfIn PDF document text
    • http://wilkinsconnection.com/clients/9/94/94ba1e7d864c5c8af3bb481f5f9f31de/File/17544080149.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/63811733260.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=biogas+is+and+cheap+for+cooking+and+heatingPDF 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_off0000fdbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBD 17112 bytes
SHA-256: 949f850af9ad46bcb094fb6630980de20ec58aadef9cfccb9779032f5aae921e
font_01_sfnt_off00012aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000142c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142C3 11000 bytes
SHA-256: 9c3a053d0a3f684107403377c81c1be1ef02f5e759b1ab33d985e12064014101

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