Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4cfd5944ce629c2…

MALICIOUS

PDF

74.8 KB Created: 2021-09-10 15:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 312a2cc0195e56165953e555eda8d15f SHA-1: ce5e7f28bce9e7926ddf8b962a9a6754231c4db3 SHA-256: e4cfd5944ce629c201576b3d237c749b6d8db67bac02dccf6a39a9513cfa0ffe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The PDF contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://ez-surveying.com/htdocs/cljr/data/files/baliwepojolapumawe.pdf In PDF document text
    • http://www.pratikchoudhury.com/fckimages/file/74918420559.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/luzonepibotom.pdfIn PDF document text
    • http://boldogelet.hu/media/74748416415.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/dp636jbgbvnmnvrldcapafttke/58593510484.pdfIn PDF document text
    • http://magdrywall.com/project-new/christianbook/upload_images/file/xaxuzin.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/86162327309.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/58962266828.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16139e294e3527---55148946443.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/77736410355.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/bepolowewomepuwaworabejoz.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/77783254011.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210905030804_bgec6j.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abff97b7a8---70249397539.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/wifovexafugen.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/72986284479.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/99229437905.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323b98b3a3c---37179483661.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/vuwejunadani.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/ginapisivimenanadejameten.pdfIn PDF document text
    • http://salespate.com/userfiles/file/xonemefebobumolusesuruda.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/2594750946.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/xetojuguji.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/42201999766.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=shadows+house+episode+4PDF 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_off0000c295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC295 16760 bytes
SHA-256: a55ae84ec5652f8a2ddb47cd8a01090f002344440be2574b5ff63d45061142cb
font_01_sfnt_off0000edd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E9 10480 bytes
SHA-256: 4ce9510d0e17ebae18de58f51e4248d8bf17060dfb8015b5390f6ad0c622ca3d