Malicious PDF — malware analysis report

Static analysis result for SHA-256 430a75a4b4b8ffe1…

MALICIOUS

PDF

77.6 KB Created: 2021-09-01 05:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5c7bd539bb131d9bb8fd3c2b59432c5f SHA-1: 819c676f9dd4a4f8fa21557e29c0063b25b88846 SHA-256: 430a75a4b4b8ffe1c731ef0e4438dac47a2231939d8a0d5c67b78d7bbf5c094a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan-like behavior. It functions as a link farm, presenting numerous URLs that lead to external resources, some of which are hosted on compromised CMS upload directories. The primary purpose appears to be directing users to potentially malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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 https://thuaphatlaihanoi.net/uploads/files/47562132322.pdf In PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/rurefajewefawo.pdfIn PDF document text
    • https://crpm.ch/ck/ckfinder/userfiles/files/23713105610.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082484791915---ganolosoxekopoweni.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/xuxifuroveremafokisuxo.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/67cd16b11eb2396082ba81d1eb82f972/97069841734.pdfIn PDF document text
    • http://onlinevay.com/upload/files/juwitukub.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/qi4hjm8uqgddt9v0ga2c9ava22/37316654859.pdfIn PDF document text
    • http://ozkayalarlojistik.com/userfiles/file/52383569645.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/litifumuniwefigup.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/14895939416.pdfIn PDF document text
    • http://domplus.su/userfiles/files/57376699614.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/11314796714.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es//ckfinder/userfiles/files/nujonog.pdfIn PDF document text
    • http://abc-tel.ru/data/File/38912046399.pdfIn PDF document text
    • https://sensorservice.org/userfiles/file/jagiwutufegidegaxi.pdfIn PDF document text
    • http://lagrupacio.cat/file/karudusupixanuwaxi.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/07/file/71764557414.pdfIn PDF document text
    • http://agrion.org/upload/fichier/89034485845.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/26810911049.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/bovudesanefinazagorifamot.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/30269551174.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/badefutidot.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/d5e131487a36c027b049546258ff2b10/gatatopubazuwijokov.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/fqv816vhbfo4c1cvrtu1ghu865/11257706470.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/dujenakoxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=integers+adding+and+subtractingPDF 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_off0000ca3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE255 10568 bytes
SHA-256: 42c3f489192e6dcca4c02473f30dbd34e93aa696ebba5a8bf1614518768a18b1
font_02_sfnt_off0000fa59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA59 18148 bytes
SHA-256: a550ed37fb5ed1b0d3d2be55d9e2b75b0ce2abbca67a1f81cecb31040ca20c72

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