Malicious PDF — malware analysis report

Static analysis result for SHA-256 215813f7dd60ac66…

MALICIOUS

PDF

94.2 KB Created: 2021-09-05 04:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6d0c930aba85c15b3f539c266a96b802 SHA-1: 8ac67d336aa1283d4b154901e009ccea4e38d91e SHA-256: 215813f7dd60ac66fce737e7efdca6540c791ba6889d626f9100919c27a0bc69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous external URLs, many hosted on compromised or disposable domains, suggesting an attempt to lure users to malicious sites. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly indicates it's designed to facilitate the download or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://zuche0551.com/upload/file/nabaxe.pdf In PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/32880513393.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3bd1ecf94---duzoboganamuzinomarawu.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/mepiribuvizodadabajageb.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3353d6156---67718135302.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1292a509f---vufuxopenefe.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/74947556140.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/82725743766.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/19435373985.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/14501325208.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/72047802325.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/7klkg98n9k0vsokqa0l0eqqrca/zadijidesejida.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/23784241492.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083db997c381---josuwanexowu.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/73423290845.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/18577677005.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/vamunebisazapir.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/8bbd948a0fa818d37e5c1e223636134c/11433150525.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/sazuvolozuvepofajebowufu.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/rarixadalolibipafifaxap.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/notuvegaxal.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160741c892e5dd---95394969661.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f75719933---68609793661.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=el+caudillismo+en+mexico+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_off00010550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10550 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D67 10768 bytes
SHA-256: 38d5aad7c8c08efb66fa06ad4ba7be0a402b7b5c5df5197dbcbecbaca43d078e
font_02_sfnt_off0001361f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1361F 21004 bytes
SHA-256: 3ab45eb6dcf74f36e814653153e793d72a199e9f9f20b53e18ce9c3620f0c9ba

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