Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bbe45ab0f4d54d0…

MALICIOUS

PDF

71.9 KB Created: 2021-09-03 09:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8fd73e42232485b9ca4e655af9e15849 SHA-1: 20200f031cc0439f8856287b86a2a8f7fdb178e9 SHA-256: 1bbe45ab0f4d54d0afd892910086a78469c877bbbfcc9af10458933adcb1d044
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to compromised websites, suggesting it is used as a lure to redirect users to potentially malicious content. The presence of link farms on disposable hosting further supports a malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/161262f9cc0add---sagexovalufumovifeses.pdf In PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/b0c64cae14a2a6777cbbee340a1d9055/zujurenajarezigekibone.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/33090100066.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/vimaluvezuvefumafudus.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210708_204516.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/padirinijubeligodawezade.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/lns7i2re7n8ajfe3i4fguaaukl/34586622957.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/75540533218.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/tolorusitofuzunavutixofum.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/81036994139.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/dilatufijurego.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/zoduratumavewerobima.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872eacba5e5---pukumoror.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b4bc7042a---xeketileg.pdfIn PDF document text
    • http://whewfamily.com/clients/12004/File/86582961576.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/rubelibewasabovisop.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/xopubenakomikutebo.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/f36d868300ee4f1e109ff448862c3827/kojax.pdfIn PDF document text
    • http://zaiger.ru/img/file/12081858886.pdfIn PDF document text
    • http://askort.pl/Upload/file/dobofugudugag.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/sezakosikolewerufarig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=ganapati+atharvashirsha+lyrics+in+marathi+pdfPDF 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_off0000b13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB13C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC94E 18056 bytes
SHA-256: a4e277b6336680505a68090ef4e9ea47643bf8ce9b30c9f7b167beb9c9b20868
font_02_sfnt_off0000f8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F1 10852 bytes
SHA-256: 90859caf996ec045cf8094413be13f3e5c5f177782a1313bf9f51a437fff32be

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