Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd2abf3ede9ffc7a…

MALICIOUS

PDF

81.1 KB Created: 2021-09-08 20:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 19c00c6aa8ab18e6759569286610aac0 SHA-1: 0f0c4a9e2f11d78ecbf42703298d01f284d74e55 SHA-256: cd2abf3ede9ffc7a02555607491d67b45f44d37c5c57943e77e76a47e7324207
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://dursunguney.com/userfiles/files/nemiwisoluxolikekubob.pdf In PDF document text
    • http://sziazsauto.com/uploads/files/96425955904.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/e9412cb24f61fb14ab3293a9ec7bcdbd/xolokox.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16130f1ac31023---warisavejegezetew.pdfIn PDF document text
    • https://akemi.ro/hirek/file/naboriwibetiximekoledog.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/25521147302.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/laxijorilusuxiser.pdfIn PDF document text
    • http://pyroglobal.sk/app/webroot/files/userfiles/files/sudibawovikexezas.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/jejidadaritaredadi.pdfIn PDF document text
    • http://zubrcup.by/files/files/tabisogomajisubewojijini.pdfIn PDF document text
    • http://begues.mobi/userfiles/file/33476164851.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/84490644917.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/nusepinuku.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137deb75ae62---15436187315.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/fudaminid.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/45143528078.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/pobiwukelined.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/polakepaluzafudaw.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f14e152c81---45867612943.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/dasamajenude.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/vulivugumuwakukuposibuk.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/8188ca7425fd6b1cff1bcf2558b958b1/mudoxusitolozeda.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/vixizobepat.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/48900238089.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210902232551.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=present+simple+tense+table+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_off0000d7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D7 10680 bytes
SHA-256: d4dcb3ccce61e8733785b4a6790af5bbc9846c1862991f928e137978c150651f
font_01_sfnt_off0000f00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00B 17868 bytes
SHA-256: 2b3291adeb11d64c85d716df8fd7fed844e0be763f0da32dba1a12c89627eccc
font_02_sfnt_off00011e76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1