Malicious PDF — malware analysis report

Static analysis result for SHA-256 6535332e733b9d00…

MALICIOUS

PDF

90.6 KB Created: 2021-08-31 18:21:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2036198ead5ee53869cc97d9c3428bef SHA-1: 1d36bac6e91a1d17d8a3a90d4cb0e8c06ab10cea SHA-256: 6535332e733b9d0017e860a0957e2e9e12ea9b0b955a0d0bc9039edb523eb569
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. The embedded JavaScript is likely used to facilitate these redirects or obfuscate the malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://aplus.to/userfiles/file/48295871271.pdf In PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607be7d10d328---22861897397.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/5c7bdc98881ca9d4f529b8a525017c77/56940656920.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a81199381---sajomisov.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/67350827288.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/putijumomulopawovivapuso.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/c3138443995cfe0ed508aa8773ddfd95/24487609871.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/morepuwepotokenunezubu.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/62302028739.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/d7960d9d0ac6c20aa61d75b0cc5a9c26/46504552238.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073e9de39114---ruwesamilasusowoxixom.pdfIn PDF document text
    • http://topas.lt/userfiles/file/ruzejukilapano.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/guradululezowejabozewuk.pdfIn PDF document text
    • https://webmenuplus.com/images/file/74116900673.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/4acbd97772cc09d1d31fffc6b3137722/redubopabexobojadukiva.pdfIn PDF document text
    • http://chinahongji.com/d/files/6585835195.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087439b931a8---ronogewevo.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20215231314383034.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/xevelenu.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/54943282012.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/32380287956.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160a9462b2109b---90204748021.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/nirekiboxuterenuterafijok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=puppy+shame+meaningPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF564 17520 bytes
SHA-256: c9242b4a0c7d5785a337266b38884117287130a0dfc700464eed14a7a2ec4264
font_01_sfnt_off00012317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12317 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B24 1756 bytes
SHA-256: 4f0698999f8174c65e65ad3ef86f35a96ae212e4c8c5af369f37814a3c245102
font_03_sfnt_off00014375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14375 10552 bytes
SHA-256: 031ad94c8cbfbe1a49dfa4e962be34d65f53be778c085b3b1323a88486400fb6

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