Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6ef79d56592bdbf…

MALICIOUS

PDF

84.2 KB Created: 2021-09-03 00:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 96c283f9214e04c05f773b44e757ed83 SHA-1: fb007a484c27c29428a02a5354a5c631e0488bb1 SHA-256: c6ef79d56592bdbfff83588705fee1a5a29de87a42f3a526ff2383d416366423
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/701j1amql7p3fesrpfk61r3l05/66836086114.pdf In PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe7e5dab3e---74329404880.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/0430f7f855153ce9d7b93b9a114788d1/wawuxetenova.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/79188064056.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-7-28/20210728164134481031.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/37021991957.pdfIn PDF document text
    • http://ipceurope.com/assets/file/wolotokezitobok.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/raxomojexaxin.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/40265097291.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/52736316325.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/jodijexawidi.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/1664202784.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/24921943476.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021081522485673499.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce06c0b760---57495517179.pdfIn PDF document text
    • https://mimpiindah2.com/contents//files/puvivixaxoloramikifo.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210804181617_86ezhd.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/xopamunat.pdfIn PDF document text
    • http://ukrfirework.com/images/file/gifibotajonoxarar.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/31260779279.pdfIn PDF document text
    • http://fullx.net/files/zusab.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/82974246149.pdfIn PDF document text
    • http://usagimatur.com/files/others/jagulunuvevedubalu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=finan%C3%A7as+comportamentais+livro+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608129880da1a---vogolomanexipisepadevonu.pdfIn PDF document text
    • http://s250801404.onlinehome.fr/img/uploaded/file/41817062912.pdfIn PDF document text
    • 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_off0000de4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF664 11020 bytes
SHA-256: 6b02df382edca731bacf4bc4c3189d2cadd9a36e72c86e0ac795e1b1947a04a8
font_02_sfnt_off00010fb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB2 19936 bytes
SHA-256: 0b0cbb4ddef159542e46b6ffcdedb802de25359a8243a241107d8c009dcf32f2

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