Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f4b8dae2a8b2581…

MALICIOUS

PDF

72.0 KB Created: 2021-09-30 15:09:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0d77d2ba6c67baeffdbaac7f45d822d8 SHA-1: c93da28112ab6bfd3310fb186b1861ea743e4f03 SHA-256: 6f4b8dae2a8b25814abdaa8abcdcd5c42c16a209622139b8eef40f0fc4cc85ae
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 manipulate search engine results or direct users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://orderleesushi.com/uploads/files/16081065038.pdf In PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e3ff94b69---gominitunoxelolonuv.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/15086562890.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/65072088028.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/mugijalowojenu.pdfIn PDF document text
    • http://magiepourenfants.com/images/mediamanager/file/basowikesox.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e2f9eeb0b5---gowefubadowakiw.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a27e9b5138---96277297525.pdfIn PDF document text
    • http://grafitym.kz/files/file/repepepapitugabifedun.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/24103249166.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/vawew.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/newotagitavaleb.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/watenafesowano.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///gipiladinoleti.pdfIn PDF document text
    • https://loctra.net/userfiles/file/wadevakixutus.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/59b492603c120ad6590ba7e3d370193b/dojoselipevudogijibek.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/4885635033.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613648b967eea---52903165206.pdfIn PDF document text
    • http://regcureguide.com/files/files/fepabonusigarizimunufaju.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/2044045111.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/4991970861.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/lezitexodowixegunikenix.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/mivaz.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/65895151130.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/23874542626.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=drone+view+map+hackPDF 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_off0000b7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B3 10572 bytes
SHA-256: a56559fa4f087cb20a13abc0c75018d21306c267cf8eb75c5b811386b2bc745a
font_01_sfnt_off0000cfa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B4 16816 bytes
SHA-256: 7d5d079bb9e30dd9160e2bda8eb9342666b8865f9c5f02876b7e0ba37ca8b1c2