Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd25027d6f1ac704…

MALICIOUS

PDF

87.7 KB Created: 2021-09-08 05:35:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: de0fbeab40169ff6347ea94cf1d692f3 SHA-1: 66c9979674706692b2e262759e6db824818bde77 SHA-256: fd25027d6f1ac7044b51c218f0f495d0e2e6deeeab1312f6674d5b933de08db0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. Several heuristics indicate the PDF acts as a link farm, directing users to compromised WordPress uploads and disposable hosting sites, suggesting a phishing or malware distribution scheme. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kawanmto.org/contents/files/71498351765.pdf In PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609698545e69b---39987241343.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1e31dba51---fibujezovuberej.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/dh59ons7je3f8s19abojc1d4la/92631991480.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/48592306707.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/2923d5gg689ugpji05js3kki8t/99255293276.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/mududefuxadoxojofe.pdfIn PDF document text
    • https://bhavanarayanaswamy.org/userfiles/file/furegegopidojamikopo.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757ee37f913---65356548358.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160c0202aa307d---fikevopuwi.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/ac021dc2989bd855fa0e085628a20484/12652056177.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/scph1m3jta2bc3u8rgi446lvt4/46119116862.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bb22b15154b---retofowadepujipenikuwu.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/d32301756821dec39c0a5537ad795a38/xitikajivomobi.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fae3ef8f7a1---72488024268.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/zogamuzawalepoku.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/xitor.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611968b09e54b---53985911832.pdfIn PDF document text
    • http://slsnn.ru/content/files/47518021571.pdfIn PDF document text
    • https://anjingliar2.com/contents//files/kidilakilepizav.pdfIn PDF document text
    • http://wawa757.com/uploads/files/kujaxuxazajimozoburu.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16089384fcb50f---xolukoxaviwobu.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/e9a510429dfe4e8813a984202222113a/35187597420.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/zokipu.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/banepitodesigebopamuno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=dangers+of+self+medication+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_off0000f112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF112 18140 bytes
SHA-256: 13e68cf6814c2208f025d62e55314eee11fa8935410d1a57f781edcaa7df243d
font_01_sfnt_off00012020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12020 10964 bytes
SHA-256: 9ffac612048c0f278ec30ad771c49fdb943b069965c4b9968dbaceb2a080ab69
font_02_sfnt_off00013955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13955 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1