Malicious PDF — malware analysis report

Static analysis result for SHA-256 20ec9170fd64588c…

MALICIOUS

PDF

173.8 KB Created: 2021-06-19 01:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 5b9c2c4e11465da7f52734ef0b6e37d1 SHA-1: 4ca7b2a79bb072b66d73f9c3ac100874a29a5aa2 SHA-256: 20ec9170fd64588ccfdb91a30a8fc2dc388423970e7b4c3c534883a09b30a534
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure suggest an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dgjinhak.kr/DATA/upload/files/202105270216323511.pdf In PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3271121f97---xifujem.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725fb2bc6ed---bogivogogamebovofifukej.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/jowexekodepibode.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/1jq60prtp2dmst552glv9bg0p4/fabitilape.pdfIn PDF document text
    • http://gerocuki.hu/user/file/vozikijixagejap.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/25630864637.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/o19njiuda6esvv0pp09l6jsad5/50539799624.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5dc4fa9a3e---53067853048.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/24872391415.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/60008526390.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/96581454312.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/15c967b0c012cbb2ae49605f92c32b7e/96299524008.pdfIn PDF document text
    • https://lasanisports.com/files/86935037207.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ba667a693bb---94379723567.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608722bb9f839---fuvugepapepumoti.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/1bcc757c9f2f4fd63a89b3a3139b0ac8/suwudejivafabadola.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=egyptian+god+of+balancePDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000264b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x264B8 5248 bytes
SHA-256: 830efb443a3207e937488b31abff7108c4e66f4029db484e72f3487bf41a3600
font_01_sfnt_off000276b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x276B9 16720 bytes
SHA-256: e7c281289c71d687ddda4f52c577652f9ede5257fa0e5de059d087e056aa42b1