Malicious PDF — malware analysis report

Static analysis result for SHA-256 592f7ff4e5c83d70…

MALICIOUS

PDF

166.6 KB Created: 2021-07-07 02:43:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 673470e9ac2c4804ac464c9f53f2c9e6 SHA-1: 73794d42379790e1b9fedc05577b73304f6b78a5 SHA-256: 592f7ff4e5c83d70a18ccc9477d01d0c756c1ba1eeb5addafe1b23eb28025088
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and a high number of external links, many pointing to compromised WordPress sites, strongly suggests malicious intent. The ML classifier also flagged this PDF with high confidence. The embedded JavaScript likely serves to execute malicious code or redirect the user to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9713

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://aitalk.vn/upload/files/dikawogotafekopitibet.pdf In PDF document text
    • http://www.addvanceo.info/userfiles/files/28905726438.pdfIn PDF document text
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/2058068613.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ca46c1b59---povole.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/638234c41b432a84e929a9966c6ea731/nevepolazipiroxevifurew.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607803afcedcf---52061378107.pdfIn PDF document text
    • https://curryleafharleysvillepa.com/hang/userfiles/files/52015583358.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/wovabusutegonuxov.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/8bbvjfpudrduu35110tt7ggu8q/pazifanolulowasej.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/16jd5piqg397jtsvjl9soqdcpl/85184591532.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609276a3af80e---ximomosujebowatogunev.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5efd44d78---86176201268.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ba664df3d---wesabubajorofivejesa.pdfIn PDF document text
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/buvizokanelelikedi.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/bugexirejami.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/70268107989.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813f86c9dff---lifovuzagipapezopamabuka.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/b8eqg0ndnue83np0r2ng1m9o12/daropasatekad.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/pobejewugej.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/89cca2c8827e9b2b75494e74072a0757/32499353735.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8021c3a277---90005529484.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/xokikodikakifesositagebo.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/5e15b78273f616d78669d581904c8ef1/kizalap.pdfIn PDF document text
    • http://lighthouseofworship.com/clients/44803/File/vezozepuxixa.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/tezenuwewufakopulasona.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/zujorelegepegode.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160779f3e92c8b---46151586317.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=the+type+of+rna+containing+anticodonsPDF 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_off000223f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x223F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00023c0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23C0A 21104 bytes
SHA-256: 70fb8c4f763f20c17541846a63c1544455205246a84fc1a9342bd767f192df03
font_02_sfnt_off00027349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27349 10932 bytes
SHA-256: a64b90485d49f7b0a05b2e2dc5737709c3c9b06bdcaf990e0461ff285d430b6a

Open this report in the interactive analyzer, or submit your own file for analysis.