Malicious PDF — malware analysis report

Static analysis result for SHA-256 d65d52ff70e5ae79…

MALICIOUS

PDF

85.0 KB Created: 2021-09-18 13:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d20500329e8f2b06b16525519ca572ee SHA-1: 32464246981f78380919ecb674ac7898ae90ba4c SHA-256: d65d52ff70e5ae79fdcf66d0ab23540ba1fb33f6e23b290a9c95fa494b585cc2
104 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 executing malicious code. The PDF also functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. The ML classifier strongly indicates maliciousness, and the combination of JavaScript and link farming suggests an attempt to lure users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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://willmarareachamber.com/ckfinder/userfiles/files/12087511823.pdf In PDF document text
    • http://saltokisport.com/uploads/files/36881210672.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/1630080429.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/madixemejijovijenaka.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/popiwojanotefazos.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/divezulemezaforazip.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f33157a180---jopafoj.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/2839949686.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/ec1fea13d15788c7e874ca934c0b75e0/38714116178.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/68326998996.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/80138413317.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/pukisuz.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/06ooivub4a4obe6j20gouctmt0/jezovuleragoku.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/gasulugufalejipidikuv.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/jefazit.pdfIn PDF document text
    • https://dm288.com/slicice/file/49227514404.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/daregekuzaxa.pdfIn PDF document text
    • http://gapp.fr/medias/files/nipigovinupapibarujad.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///sakaxamevukujibe.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410f8693a99---11649237058.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/rofepolelazemojiza.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/zemazog.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64937363471.pdfIn PDF document text
    • https://kaparatt.com/images/File/zapipozivopijobokali.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/93082582792.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210904_B8829D7A2A81FDFB.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=android+cihaza+windows+kurmaPDF 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_off0000e4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F2 19112 bytes
SHA-256: c19ea84011463604379d598d6c3669ecd34c5d4eba2f6dc382ed2bdd094ef67d
font_01_sfnt_off000113a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB7 10676 bytes
SHA-256: 2021446217e78478d97854ffc3a02f5fca382ce4d52459b14620fcceb69d8e21

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