Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec8a83bc25a3fe59…

MALICIOUS

PDF

86.3 KB Created: 2021-07-22 21:19:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d3c0ef83394c6a76d90a3361c5b401f4 SHA-1: 84a21e4d36c42717b2a40dbb4599478dbe9aab13 SHA-256: ec8a83bc25a3fe59fbdf59061d2a1334dcbb69958c747f74c36507a88b8e9f82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of links, many of which point to websites hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of numerous external URIs and link farm heuristics supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://gasthaus-steinkirchen.de/img/editor/file/jigejatozojotobifek.pdf In PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2128a9a66---lunitobejemiwosivex.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a74d5b178b1---kiliwopobetetuzikokefa.pdfIn PDF document text
    • http://luatsutiengtrung.com/app/webroot/uploads/files/72571300859.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/1bfl8avbc9euh7l8f42e0lr9l1/solilerij.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/a123c8740087c53b1e5c6a5c36e46d57/88396100313.pdfIn PDF document text
    • http://paliukenas.lt/i/File/98199432470.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/tas38j4cumin2ce1gbfg0kj4fk/nerifotulumikefakugupore.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/wifutosawepijuzapodod.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/vigexixemofizagipepazisaj.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082aac5652a5---85321825943.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/vinilakegarowumi.pdfIn PDF document text
    • http://twxcd.com/img-aim/files/17104353695.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/rumofipulel.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/mifewipimixuditigen.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607c85fc9320e---71681150595.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/64fudfcl9stsk5n7003rsjvsbn/10548648509.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/satubefizodom.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/guferekaso.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/65152972276.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/9d1b65d7ae1108882e4ba4fbe28a60e2/pajufodesutinu.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/17646617825.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210606_4E6FFBC240CB2445.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbf8f41327---bovikarutulupidawo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=wwe+gta+5+game+download+for+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_off0000edab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAB 10740 bytes
SHA-256: 17ff9f26dcc598194f3dc092e163a66e0476c64f6b2470645601399f856cffda
font_01_sfnt_off00010629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10629 16900 bytes
SHA-256: 6986e48a88ef4840a5e33153122bd682be9ca66a886b6a2b5ccf61475e163de0
font_02_sfnt_off0001326b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1