Malicious PDF — malware analysis report

Static analysis result for SHA-256 499ca4cb9b65e1b0…

MALICIOUS

PDF

82.9 KB Created: 2021-09-07 18:03:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e6d0ca593a31aaaf36df189cc9e71f6d SHA-1: 1a507e956974b4d2c8c90bdfadf4a758f2f91e81 SHA-256: 499ca4cb9b65e1b09a0181f4d9c8c1962cafaab805e3fd3e7009a8e51043302f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document functions as a link farm, containing numerous URLs that point to various websites, many of which appear to be compromised or disposable hosting. The primary purpose seems to be redirecting users to potentially harmful content or for SEO manipulation, rather than delivering a direct payload from the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://fipjp.com/userfiles/file/89531406921.pdf In PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/f63c33c2a4b8e01cd936ad24187ad04b/76034505820.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6baf7a713f---mofaruj.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/68408384650.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/49659259075.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c59d31c20fb---44387732760.pdfIn PDF document text
    • http://xaydunghoangthanh.com/img_duhoc/files/larefalisiritaw.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/vuluju.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/komugej.pdfIn PDF document text
    • https://limsurempat.com/contents//files/balojedujobafe.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/3258404308.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/josoguxixovolofubevaf.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16102ee70ec51d---gebuw.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6f094b993---metabemozode.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com//ckfinder/userfiles/files/selipuwik.pdfIn PDF document text
    • http://c-amc.com/upload/files/56662034154.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1610dc364a22ab---ziwexovow.pdfIn PDF document text
    • https://baongochoa.com/upload/file/51737700406.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e10c40411f---sukowetokoxuvaranofofile.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad8db71ef7---welolafederafosol.pdfIn PDF document text
    • http://erex.hu/upload/file/wipalitofigi.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/97139031006.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/kumilugilapuvekotigav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=abs+and+squat+challenge+pdfPDF 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_off0000e08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08D 10956 bytes
SHA-256: 4486e61507ab8eb3ae2edee688586b6743f081146596898bdd55a238e84d504c
font_01_sfnt_off0000f93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93B 17512 bytes
SHA-256: 0777b9f123992ac32dd4d751538ffb1a4a161bea3e401fca806cf8665c7ed37f
font_02_sfnt_off00012651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12651 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.