Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f4cf5dc6e1a9a40…

MALICIOUS

PDF

99.8 KB Created: 2021-07-02 09:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ebc0aac568f5fed77388c8ade6caa210 SHA-1: b3785bede3f660c3476fbca61c384eed29641de2 SHA-256: 1f4cf5dc6e1a9a405f669bef0538e80f5f7b201452a678a1f8f1c9781771649f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely intended to redirect users to phishing pages or download further malware. While no scripts were explicitly extracted, the nature of the link farm and the PDF format suggest potential for embedded JavaScript to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 6

  • 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.
  • 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://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/8refjivjcqj8b2c3josnhohedn/23571629139.pdf In PDF document text
    • http://bociany.sk/media/file/mijomerowodev.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/lr0pjm3adflhppp758m4jkkmja/15118854089.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/0643a1954f6fbc0eb47788dea69b2774/68209814690.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/7b5a249b0701f140c0781580117fe3b3/82735971375.pdfIn PDF document text
    • http://rgjbreunion.com/clients/6/69/6950e03db8b1ea894755b369f0a03c31/File/99886075037.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/bivefuwevesarewux.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fb4ff2e1fe672fbf29c1673459a0ae21/48605171076.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609de14eec87d---94051161921.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/furabelakewilizez.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/ecd0d40af1d334e8d729dc6687ba1e78/63273468981.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce2520bae45---68984624538.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc29a852170---jawujaru.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/60239743196.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/94737623871.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/3278ae320e23c35ebad4616ba997f6d0/14637483820.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/50247258980.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160897527cb188---goturetogib.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/zemodadarez.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/878d08f042a8a880ea977c65394924d8/zetuva.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/51faoopbkptjbkid8fgudp4gst/tikukovab.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/28cfd2ba2a59614c54e99101e362c404/60953099670.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/51156191588.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=1st+puc+physics+question+paper+2019PDF 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_off00011d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13563 18788 bytes
SHA-256: 2a0fc4b3919abdf9cb0fb2607e63c10b2c532ccb9a8b3b9c5368fb6099e53738
font_02_sfnt_off000167b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167B8 11152 bytes
SHA-256: a8cf0c51c353f3b1e266b603472f669de3473f18c3df38b9b8a64ea97e2f6178

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