Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc843fe5f7fed9cc…

MALICIOUS

PDF

81.0 KB Created: 2021-09-06 16:04:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 07b50c1fdaecfdad0ccfb76a898be91a SHA-1: 3f8933150246b9906ac3b8df0ae257c8a6ad51df SHA-256: dc843fe5f7fed9cce7ec96fc45b34a1d147de7cfac4eb689325dd4ae343afd58
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple potentially compromised websites, including one hosted on a compromised WordPress upload directory. The presence of external URIs and link farm heuristics suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/st0pivj7nr6a99cr3a2k9rrcbi/18264495037.pdf In PDF document text
    • http://yeditepegumruk.com/userfiles/42485713287.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/83815226762.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/thhguqgj1en73b5udi232t0n4d/13088466500.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/gilozunoforovupa.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/8e201c919518c480a7ee76cc6563e730/xudalefelud.pdfIn PDF document text
    • https://menu2uplus.com/images/file/27758968062.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610bac96867e9---maxizizinuvodowuvoju.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/kosomutarejegifopimizif.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/kuzires.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef7391bb4d---dobezudazoroxelozojok.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa75fd129c---65309738342.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/3cb2b9c109c000f72fdef2a14d6e9584/73058372904.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e248a4cb71---51940492000.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/kolug.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/togadivurefag.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/wigifubise.pdfIn PDF document text
    • https://cuichi177.com/uploads//files/202108090726311068.pdfIn PDF document text
    • https://ksboutlet.com/file/files/59037105117.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/34731648018.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/60614645065.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a610db68cb3---73517548330.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090311275641454.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=transformational+leadership+examples+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_off0000daa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA3 10828 bytes
SHA-256: ffd3b86d64586669fa9f45e89193b7acbceb8b7553818c22759b0d3dcfe2e2e4
font_01_sfnt_off0000f35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35D 16664 bytes
SHA-256: 47590e97489ba85fa4a0fdebfa16d96f3e433c33acd86b2842fc1beb47dacbd3
font_02_sfnt_off00011e12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.