Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0ba659583ec61b7…

MALICIOUS

PDF

73.7 KB Created: 2021-09-15 16:17:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 39a5ceb23f21726e03d8b893d7e07d60 SHA-1: d48ccf29a8aa0835f15ca9fd392669f52f3e5c2c SHA-256: f0ba659583ec61b7597a113773c39b62025b87ac5e5f35fb929398e423093bc3
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised CMS upload directories and disposable hosting domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to exploiting PDF vulnerabilities or delivering a second-stage payload via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/9280120696.pdf In PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/1a74491d8f75952b8c1e606dc8e7a0a1/sizukawitogijatima.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/12136f8220e14588dfb4c8394e6df207/wogazavat.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/5715270733.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/rakotukatoveketix.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/32406236481.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210905125539.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/fawofedaxeluvosa.pdfIn PDF document text
    • https://mihalex.by/files/files/nugefedowati.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/bafugututo.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210908_174657.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/visiniwi.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/1a8ecdec72f006f36d5eb228f094604e/redotaxawefumog.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/zazobokuvoguvara.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/xamavanejibinat.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/15512611079.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/27291711290.pdfIn PDF document text
    • https://tckontrola.hr/files/92794152474.pdfIn PDF document text
    • http://rayanchem.com/d/files/29583368595.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/92220885849.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/zupobapipofixosudelo.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/wuzifuzabef.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109070405567430.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=cara+mengetahui+ip+address+hpPDF 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_off0000bfe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FA 10804 bytes
SHA-256: 2669fa95a6b8b7dd61cf62a7a3c171ace69e330c573bb357362231e0228c2e10
font_02_sfnt_off0000f073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF073 15824 bytes
SHA-256: 6dd50a62e1d4a8013414b307560db8d04b8864df7f9e1cc89c27db855fbe92cc