Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4f55f10837659d9…

MALICIOUS

PDF

74.6 KB Created: 2021-08-30 06:11:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f1efd2893901f4243045c3446b9af840 SHA-1: a13514db9cdda068e2e0321522f090853a5472e9 SHA-256: f4f55f10837659d9edc1e8e921024425ccb7b497e68a573f1829ccdd8e4b28f6
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits PDF vulnerabilities. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms on potentially compromised infrastructure strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://influences-vegetales.eu/assets/Image//files/wituvonaned.pdf In PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/74b25e274ae24bf118305410948b35cd/xezikegugesogirisi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867fcbcb571---65215300891.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/dulabusi.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1763658048---74550140911.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/kelorasavonuvubiragav.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210805_08FBD7138D28562E.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94592352221.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/sefudewogowoxenijiga.pdfIn PDF document text
    • http://xn--om2b25zm6igqb.com/ckupload/files/mewajolozosal.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/vajujof.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/kejebixodaf.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/4c7ae62d4af8d7e9e6b342c6b7138137/97821877047.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/78878095855.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160844d22ec155---pisolowudafamorukurem.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/56a1da335062ebb12f6d3d5270911df9/nalalad.pdfIn PDF document text
    • http://446888.top/userfiles/file/33614972648.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086ce37f15cc---tujanowoxawimat.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/72974643663.pdfIn PDF document text
    • http://monroehighwildcats.com/clients/40160/File/7237350675.pdfIn PDF document text
    • http://prestopc.it/upload/file/fixepira.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16089a8bf3ecf0---5095669382.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/labupunegefibeg.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/zefugedaruxev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=one+function+of+chloroplastPDF 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_off0000c039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC039 10700 bytes
SHA-256: 6f810055fffb4cf8e98bae6a26dd6cbea09e1758f44e8e409e1b5ff80b89d1fa
font_01_sfnt_off0000d8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BA 17092 bytes
SHA-256: 214861021c44940ebe0a8f42f2f3668c847653df67ae53d7cfac435548f5169a
font_02_sfnt_off000104fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1