Malicious PDF — malware analysis report

Static analysis result for SHA-256 09514c9f64d9f455…

MALICIOUS

PDF

74.7 KB Created: 2021-10-10 00:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4f325bb0dea9337b85c09a8bb7413b81 SHA-1: 1b9dc884473917a3eabcb5d218f3dd57e15a76dd SHA-256: 09514c9f64d9f455f1d3009ecd9d9be4584a626899d0004a6eb6bed88c863744
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress uploads and disposable hosting, characteristic of a link farm used for SEO manipulation or phishing. While no scripts were directly extracted, the PDF structure and link farm behavior suggest it's designed to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/161558e3f64303---fojesodox.pdf In PDF document text
    • http://nuitsdartistes.eu/images/file/95581533380.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/mubopuvedobufud.pdfIn PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/mobizagugivowataluf.pdfIn PDF document text
    • http://pk.mo/userfiles/file/42131532166.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/tawumusekor.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/lalelimufib.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a43d8a60be---90536479453.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/85489182896.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/lubuvovapekaritigibevipep.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/5e7e4d52b841f416591fdf99fa21ee47/lusiv.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/148b81f623d5eb36121d48e6b5ba5202/gafurujadutij.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/71184043025.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/nikaturowurimefuzet.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/83242491120.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/rofawutofupewivademo.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/gipedewadudelipulox.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/88789942003.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/direzudowoziki.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///suwakiv.pdfIn PDF document text
    • https://epiphanych.com/images/file/kaxujulabixutimelazosibo.pdfIn PDF document text
    • https://chogmai.org/ckfinder/userfiles/files/vilewanijazenet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=a+depolarizer+used+in+dry+cell+batteries+isPDF 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_off0000bcc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCC0 10900 bytes
SHA-256: 6f378fc0d49c8cae1275f76f70f762db6ab882f412aa28c0800397245c6a58f5
font_01_sfnt_off0000d5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F3 18432 bytes
SHA-256: 9d764eda42248d3a6f9f02e10c4989a8548f272eb6aab97362ffe250923e7533
font_02_sfnt_off00010582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10582 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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