Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae0a9d242da3743b…

MALICIOUS

PDF

114.6 KB Created: 2021-09-12 12:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bc59eb0aa33cef77013e454aa28b09d8 SHA-1: f0ad654395aff6188d1f7dca1cd3fecb3b7550a7 SHA-256: ae0a9d242da3743b5affc7492dc802ae340beb3de3ce7ba7cc062bedc10e4ec8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which host other PDF files, suggesting a link farm or redirection mechanism. Several heuristics indicate these links point to compromised CMS uploads and disposable hosting, with one heuristic specifically flagging a PDF link to an algorithmically-generated URL. ClamAV detection and ML classification confirm the malicious nature, identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/8q1k459m4u8p533i1csqmd4vt6/merusowedizilovajoxodow.pdf In PDF document text
    • http://bluelakehomestay.com/uploads/image/files/gutem.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/kewikipazewopazobora.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/48002519267.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/865513f4ea7891e984e39eb70da11933/6037304741.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/laguviwaz.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/50998983853.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16133d62953edf---leminelupewelewutogarumif.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/92936465321.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210905_761818E8DBFF22C8.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/4999720438.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/vuneforafesuko.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/38453634979.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/nevul.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210911114434.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/30616783746.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/60261584709.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/21193760675.pdfIn PDF document text
    • http://stonebreaker.at/mimivafuxoduwuv.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/wozatusubifumuwiz.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/xeputebuwupamuvepeni.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/texevidu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=estadistica+libros+en+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_off0001573a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1573A 20488 bytes
SHA-256: 6cfbca461b8e81f8ed380789d0261af34d77b5c71a37fac45b882e38e9c29337
font_01_sfnt_off00018c6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A481 10736 bytes
SHA-256: d1e14c74a0aeb7e60635cac04c4c2ac3b4f86a829c07a7e77c8c5a6f3b3905ab

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