Malicious PDF — malware analysis report

Static analysis result for SHA-256 752eebc8ac026d04…

MALICIOUS

PDF

70.1 KB Created: 2021-09-30 23:36:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 221be479d52ac5e197c41bae894744c1 SHA-1: 64f3380b423bea765c717286a86b7e62ada98960 SHA-256: 752eebc8ac026d045c037824b4e65ae6045106b3e49fca771ff9e40897b86d5c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded URLs are indicative of a phishing attack, likely attempting to redirect users to malicious sites for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=jojo%27s+fashion+show+android PDF link annotation
    • http://szymonadamczyk.pl/uploads/fck/file/lafitosolekogitogen.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/9385027e8b3f16134f9d10fc5a3e0c8b/13303466616.pdfIn PDF document text
    • https://2acontractor.it/images/file/7498133801.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/14558221971.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/kv506pgikd3gajp5thkb7kk0i8/pazuro.pdfIn PDF document text
    • http://pyhunlian.com/uploadfile/file/32080115380.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/lewesegazuwovonuxurokofu.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/10264568613.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/naxuwawizar.pdfIn PDF document text
    • http://kodcomputers.ro/2664/uploads/38746385845.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/34035916281.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/11692288528.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/pivefezibunosimixim.pdfIn PDF document text
    • https://ruja.lv/uploaded/file/pinagamimuzenasususemu.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/putogikakobobimoxuwaviw.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///84278638700.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/98238971649.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/25881337863.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/lepubapo.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/jebinakuruwupekalaran.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/bazuzatilivulipulikep.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/93e8ac0682e2c059f34585a798ed49c7/41688058720.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/wasimuforetiju.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad73511be2---pudomezarol.pdfIn PDF document text
    • http://apismorava.eu/docs/jaderisapuvesoxavuliwad.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/34030774519.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_off0000b5a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A0 10416 bytes
SHA-256: 194e0ca1fa8ada9e5c993875345e8c35a0032a3ab3423ddd4edc83b0b7de09e0
font_01_sfnt_off0000cd37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE549 14652 bytes
SHA-256: 315f9dc1c2a24bb647fa0afd631a2e7f393f98a4acd6a2eb8745b9c320a435f1