Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d6fd4955a52a0e5…

MALICIOUS

PDF

105.5 KB Created: 2021-09-02 09:13:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 83d17556bdd03d094ae4a45f69a0eec4 SHA-1: cc813c58f6917e51d989863371dc8ba751ab2820 SHA-256: 5d6fd4955a52a0e5b16304bb7e4a0098087bc24aec3107fce09382e45ecde8c5
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised WordPress upload storage and disposable hosting. The ML classifier and ClamAV also strongly indicated maliciousness. The embedded URLs suggest an attempt to redirect users to potentially malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0290682fbb---12842968035.pdf In PDF document text
    • http://grupposcorcia.it/userfiles/files/dinolaseberebe.pdfIn PDF document text
    • http://praguetransfer.com/files/file/nilazigig.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/bomuzivoregarukufi.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/b741e76ea076737e8caef2b938498cdd/19829155273.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/akgi3gvvmmk79d80sdfedkrog5/jesowezutavijuru.pdfIn PDF document text
    • http://partnercable.hu/files/86456808392.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/34799631141.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/f194fb172d020a41c8b463a51f053e6d/xularabujerofaxarudewa.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/sivubidomoxijoda.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/wekutoji.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/pujeveburaraw.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/69171987034.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/dowufozaxoligijoxukegib.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768a211a6da---46020601333.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/43212e3237ac9396377e9887a7b0a1b3/1159660868.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/puzodevewukubotovuw.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/12934849135.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/foneroferilasivobivuwita.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb0f14c81c---46171975908.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/bugatukoti.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160b457c569b35---21966069146.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609eaaf4a55b2---51881840667.pdfIn PDF document text
    • http://ancheng-medical.com//uploadfile/files/xoxamofesawigojuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=coc+loot+timePDF 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_off000131d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D3 21580 bytes
SHA-256: 60eb5349b3a9ab5f8105ca16cbb3ac4eb84fdef5a424760cbca99103a89324d5
font_01_sfnt_off00016aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000182c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182C0 9888 bytes
SHA-256: aaf06359a306588ef44bd6deb249cf46777c69a0d0dacf0401b106b7e76e4e53