Malicious PDF — malware analysis report

Static analysis result for SHA-256 4967cfe4c9d0e48d…

MALICIOUS

PDF

89.9 KB Created: 2021-07-18 11:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9e822d9f7666493138b34520bbc3f7a8 SHA-1: 907c4c89563e6156077a07f479ef8f44c4a6cc74 SHA-256: 4967cfe4c9d0e48dd3c0cdf2d3a65656da68322d516a8a3951e93d47f3f3f770
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users through multiple compromised WordPress sites, likely to deliver a secondary payload or phish for information. The presence of numerous external URIs and compromised CMS upload links strongly suggests a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://mpti.ru/userfiles/file/vepev.pdf In PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/913e89b0a7eea75992b4f325de7f031e/18172120576.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16070e6da2e8b6---xavutimuwaluxez.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/13787151444.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/1fc713f156k7vadmb5fcfvb8k5/salokit.pdfIn PDF document text
    • https://empresa-venta.hr/files/mixagunusiwaxajofejo.pdfIn PDF document text
    • http://bollywoodsalonskokie.com/admin/images/file/42662252863.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ad26b0c8dcc31b3a754d2b731d743c6f/gimuvibowisan.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/adbf6a3634a2d6ecd3b5a3b346d93aef/5213006770.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/d2d2f7d6200978b9d38c5796c220c782/66458530983.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16092439651a62---gilizexuji.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4c7a20f12---xomadeton.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/36540998657.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16227076361831049078.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/refixigilaxudinozafep.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/kefobe.pdfIn PDF document text
    • http://donaldbermanmaimonidesgolf2021.com/clients/0/0d/0d43fbb8ff91cab41fa1b056c0d912a9/File/moxedurokewagoneweba.pdfIn PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/wafagesigedesuru.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790ff0bdc02---48708621402.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/95114006739.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/vewinawakeka.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/23338474546.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083a454cc7de---xinedegusixapop.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/8a03917188f536ea9daba04e91cdd43f/84632771078.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=6+powerful+solfeggio+frequenciesPDF 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_off0000fc2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2B 10796 bytes
SHA-256: 04d80bc530caaceb10a4d75ff22da054c3fd3229246237585f7e2b14aa44cb32
font_01_sfnt_off000114e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF8 17224 bytes
SHA-256: 980cb6171e312a35e89d260f499fcd5a6bd62a6b3d08040430de1e2257e698a4

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