Malicious PDF — malware analysis report

Static analysis result for SHA-256 518257d86a49e6e7…

MALICIOUS

PDF

86.1 KB Created: 2021-07-15 11:06:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8cd57a8ec8b04bb2c7922f7905398470 SHA-1: e02a97de7412e656c1bfa41607da4156cbe6893f SHA-256: 518257d86a49e6e7e6eef20b5b2455e2167dec29df41203887b0f771e1e96b6c
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 and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The embedded URLs likely serve to redirect users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://huntic.ru/uplcv?utm_term=tracfone+lg+306g+tutorial PDF link annotation
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094152b6e02c---85969299832.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c3a1ca296---fatovadaro.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/475494b1bd854f831322441044dcadb1/15190862951.pdfIn PDF document text
    • https://etimes.mn/uploads/files/76310819854.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f5aa5598c---jovewogudolegi.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a411afe4a---vixijilubetixofibole.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ttj96tlisolidknahsshuj6f52/saxutezuvif.pdfIn PDF document text
    • http://lalinpress.com/ckfinder/userfiles/files/tunevejireduwem.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/46021420113.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/didodopamazoxa.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/gg2llrv8bofv4fmip8lfcs3tre/gebisaranidifobaxeladazet.pdfIn PDF document text
    • https://webmenuplus.com/images/file/84797138103.pdfIn PDF document text
    • http://simonide.org/userfiles/file/83266668262.pdfIn PDF document text
    • http://usateatop.com/_upload/files/4452501065.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083abf94823c---xetawuzibitesom.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2b56961d2---3219553305.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/28822617609.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a69679cce---xototekadopaziralizesonod.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/d75fc0c97ce73ca802d1c73de2dbb06c/mazufarijage.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/6145711059.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/885flg4g4e15vo0arg1mhknato/52900416481.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afc0d2cc3fe---24978433890.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/86042721487.pdfIn PDF document text
    • 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_off0000eb08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB08 10868 bytes
SHA-256: de79dbce481f92d72eb962baeb3a6137d68f7757932a436858ed92a7bfcbe8b6
font_01_sfnt_off00010450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10450 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C62 17352 bytes
SHA-256: 9a27c0683cbaf0ba097df0b4104b9b913aa3c05f5c34ab526cc56ccf0416f4e8