Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dc8c92be53578cf…

MALICIOUS

PDF

96.8 KB Created: 2021-07-26 06:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: a768359b886aa1414f0ffa806b8a18ff SHA-1: 36389f7ae1ef87b6071b4a4c2f4f319921e07733 SHA-256: 5dc8c92be53578cf2342b60f111ab679e091bf4126049087819b2fee77742c0a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS upload storage or disposable hosting, forming a link farm. This suggests the file is designed to redirect users to malicious sites, likely for phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/vonukezoma.pdf In PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/d81e677405f5ac4d1ccdd80ceb95fd3d/15540617226.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/q263qadd9pk1egfibpvjav1tb1/96090054407.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210629/file/16249082561747.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/2f5aca662165cde2fc4c04261433f66d/60009511789.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/88c7e2b6281fcdea81c000f89421bb76/rizared.pdfIn PDF document text
    • http://thegioioto.store/upload/files/gejibavajelazudegafa.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/55151499818.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/4464dc8b4249fc381d9fc9ba492c2c18/velapogu.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/mitoxakesagelubedo.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/95191927299.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27f2022e99---tiwamalawugemidetim.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a04f2d33c85---pamow.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084d95a8350f---wijugitofaxil.pdfIn PDF document text
    • http://algeos.us/js/ckfinder/userfiles/files/kuzixiwokimofuzen.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/493b82bb00aa82060ef6440bb4b0a7dc/26043397995.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/0a39cef6e7713f38f9bc913ae0aae71e/23458301556.pdfIn PDF document text
    • http://rurisnet.org/images/file/pisapuwasupoma.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/h0c69hoocjthls0q441vbupb33/4413476004.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d828a6adfe7---kijobutawifukunuj.pdfIn PDF document text
    • http://doyen.cc/images/upload/File/2373131501.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/ecdfe5124c33628f12bdeb56968b5072/bowiwulu.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608e995f9d3fa---dumodovobefu.pdfIn PDF document text
    • http://uco-kampen.com/media/files/milimerikevonor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=wrong+turn+6+hindi+dubbed+movie+download+filmywapPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000114f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F8 17048 bytes
SHA-256: 71f1bde56c76a90f37cded34063094e5cd111da7aac1dc42233b8da520b69f09
font_01_sfnt_off00014172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14172 11444 bytes
SHA-256: 3a181b63d965f332ef5ffb397463be3fe49ec6623329b69ca16046a9d4fdab6b
font_02_sfnt_off00015bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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