Malicious PDF — malware analysis report

Static analysis result for SHA-256 f184569a7ed11f98…

MALICIOUS

PDF

70.8 KB Created: 2021-09-25 07:42:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: e902059ea9db66c13457689ca3241e6b SHA-1: 9f3d6ad452038790873cb346443f6b6889461146 SHA-256: f184569a7ed11f98214f6d3122eba98f290b9d772c7ec29e1a68f85a00146582
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://trunglam.vn/uploads/userfiles/file/58404798123.pdf In PDF document text
    • https://jobtiara.com/files/files/mefolibabuzu.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/sixasamutederaku.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/werunaferobarujefoju.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/28336041533.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/698eghsj0ml837k99cpuh1svqk/696525463.pdfIn PDF document text
    • https://ojazzdance.fr/userfiles/file/fepaxani.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/vetebekezarikejij.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/77873719264.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/dapusasete.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd40f26c94---mafiv.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/bedogukigemegonuv.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ec6e0fbdc---dokunokadasasijolarixizi.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/62181874581.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/92310492834.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/36759904361.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/9026594785.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614c49151d8b0---sogurusulisabajijekak.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/kefefukojulul.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/67511999181.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder/userfiles/files/xutofedizaxulavusurodeb.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130121bed67f---mazimotofiku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=crafting+game+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_off0000b2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2AA 16960 bytes
SHA-256: 462098149ad9cb33e81b8571ff839f942cb4a854969fc066e380822411a892c1
font_01_sfnt_off0000ddd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD7 10516 bytes
SHA-256: acab8e32378a924d447edba4be2e780ad2fe044deb70285454b2e2e12a196a3a
font_02_sfnt_off0000f58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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