Malicious PDF — malware analysis report

Static analysis result for SHA-256 639233eba828dcc6…

MALICIOUS

PDF

91.8 KB Created: 2021-08-20 19:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 934eb04f2e68b7145714966af2c510f1 SHA-1: 499f59410ba9d5e16da8402ecd3cf625ed0137f1 SHA-256: 639233eba828dcc673a08fe6959531be8af44940b6a93959f54137f4d406176b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The document also features a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious files or redirect users to phishing pages. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • 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://wipaphun.com/UserFiles/File/3056764224.pdf In PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/c4c7jud9hgidf1hjljcck3ca22/goxobijanusifise.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/5b07e3918b49bc7180c32bc7b5e64003/82075260627.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/xebabugesijuboxulo.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d93596a77a9---tukokuwifekusituriropib.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/nonkchku2t9sr5iacdf5stufa3/56726706240.pdfIn PDF document text
    • http://webursitet.org/Files/file/popizirokurapadu.pdfIn PDF document text
    • https://songhongresort.com/img/files/72022818935.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/mopomolowodi.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/ai62u5vq5qii13qsl8u751a4r4/jiketosesufoxino.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/rejozepodelagutipap.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/av3kqtfkq0c96mbu54bgit5mou/togubanug.pdfIn PDF document text
    • http://valifyrepapillon.com/clients/6/68/68e1c6a84db99a04c21676ff826d6e37/File/sukifefonogim.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160755e2722ee2---lajizinikixokudilupawivag.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/fajubatokibuvok.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/powatik.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/117808261.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/15613442058.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/92535795807.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/widitifo.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/7304796582.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/37242355384.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+download+application+form+of+upscPDF 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_off000101ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FF 10828 bytes
SHA-256: f4ddb21439099250d5f620bea873809a71bd3ad409ebdb6f0f9831a34c33bdd4
font_01_sfnt_off00011af7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13309 17524 bytes
SHA-256: de0d98ac699cb93c4dbc8addcc08019cd982cfcb75fc543e84d1c1b681acae89

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