Malicious PDF — malware analysis report

Static analysis result for SHA-256 8359c86918129987…

MALICIOUS

PDF

80.9 KB Created: 2021-09-09 22:09:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c47e56c72c24fe214455fd62481d2d1e SHA-1: 257ed7ac6ef37d02bd3974368ef92e2c581e36ac SHA-256: 8359c869181299874d197da3d7f2c10c9f5265992a875dc0f0eadfa3e61f3f02
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 CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://equipociclistaugeraga.com/ciclistas/userfiles/file/74504928486.pdf In PDF document text
    • http://limobebe.com/userfiles/files/99493371554.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c99eaf817---18550141658.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/3388144300.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/wuzod.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/55033933921.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/d740de71817bf39305629ea1a039f0be/bigikefebotafidimiwugeg.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/57382117205.pdfIn PDF document text
    • http://195exim.com/datas/files/lunuku.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/sodijijofokuregurajesajo.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/melulemepoji.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/21251597813.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/75524570179.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/3190953259.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/76882631293.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/45749325323.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134c84e2315b---zemowufukowirera.pdfIn PDF document text
    • https://bepcongnghiepphuchung.vn/userfiles/file/gowoxozel.pdfIn PDF document text
    • http://scarpatti.com/files/ruduwupove.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/51193937486.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/5c2645d8eae1ea4ed9b7f5b9d3f37329/zujonazevinug.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/tafokowimibewisuvon.pdfIn PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/tovefonikigukedud.pdfIn PDF document text
    • http://netdepphunu.vn/images/userfiles/file/86685477620.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/xamodazazoki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=hero+emblems+androidPDF 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_off0000da18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22A 17512 bytes
SHA-256: 23ae8e4fd7663cce0d398d3e65c7f73f0103f468d1480e3b30fdaff3bd30cc68
font_02_sfnt_off00011e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E33 10444 bytes
SHA-256: e7291624f6b5386b47fef2b9f67db6b456f548924060e6ad1b02314b0cc5c824